Publication list - Publika - Scientific publications from Oslo University Hospital

Publications by Frede Frihagen

128 publications found

Original articles

Oftebro I, Skjaker SA, Fridheim HL, Frihagen F, Meyer HE, Nordsletten L, Solberg LB (2024)
Decrease in incidence of distal radius fractures in Oslo, Norway
Arch Osteoporos, 19 (1), 28
DOI 10.1007/s11657-024-01383-6, PubMed 38602605

Alm CE, Karlsten A, Madsen JE, Nordsletten L, Brattgjerd JE, Pripp AH, Frihagen F, Röhrl SM (2024)
No benefit of the trochanteric stabilizing plate on loss of fracture reduction in AO/OTA 31-A2 trochanteric fractures
Bone Jt Open, 5 (1), 37-45
DOI 10.1302/2633-1462.51.BJO-2023-0082.R1, PubMed 38240179

Saatvedt O, Riiser M, Frihagen F, Figved W, Madsen JE, Molund M, Furunes H (2024)
Non-operative versus operative treatment of suprasyndesmotic ankle fractures: protocol for a prospective, multicentre, randomised controlled trial
BMJ Open, 14 (1), e075122
DOI 10.1136/bmjopen-2023-075122, PubMed 38191245

Andreasen C, Dahl C, Solberg LB, Borgen TT, Wisløff T, Gjertsen JE, Figved W, Stutzer JM, Nissen FI, Nordsletten L, Frihagen F, Bjørnerem Å, Omsland TK (2023)
Epidemiology of forearm fractures in women and men in Norway 2008-2019
Osteoporos Int, 35 (4), 625-633
DOI 10.1007/s00198-023-06990-6, PubMed 38085341

Solberg LB, Vesterhus EB, Hestnes I, Ahmed MV, Ommundsen N, Westberg M, Frihagen F (2023)
Comparing two different orthogeriatric models of care for hip fracture patients: an observational prospective cross-sectional study
BMJ Open Qual, 12 (Suppl 2)
DOI 10.1136/bmjoq-2023-002302, PubMed 37783524

Omsland TK, Solberg LB, Bjørnerem Å, Borgen TT, Andreasen C, Wisløff T, Hagen G, Basso T, Gjertsen JE, Apalset EM, Figved W, Stutzer JM, Nissen FI, Hansen AK, Joakimsen RM, Figari E, Peel G, Rashid AA, Khoshkhabari J, Eriksen EF, Nordsletten L, Frihagen F, Dahl C (2023)
Validation of forearm fracture diagnoses in administrative patient registers
Arch Osteoporos, 18 (1), 111
DOI 10.1007/s11657-023-01322-x, PubMed 37615791

Dahl C, Ohm E, Solbakken SM, Anwar N, Holvik K, Madsen C, Frihagen F, Bjørnerem Å, Igland Nissen F, Solberg LB, Omsland TK (2023)
Forearm fractures - are we counting them all? An attempt to identify and include the missing fractures treated in primary care
Scand J Prim Health Care, 41 (3), 247-256
DOI 10.1080/02813432.2023.2231028, PubMed 37417884

Comeau-Gauthier M, Bzovsky S, Axelrod D, Poolman RW, Frihagen F, Bhandari M, Schemitsch E, Sprague S, HEALTH investigators (2023)
Is the use of bipolar hemiarthroplasty over monopolar hemiarthroplasty justified? A propensity score-weighted analysis of a multicentre randomized controlled trial
Bone Jt Open, 4 (5), 370-377
DOI 10.1302/2633-1462.45.BJO-2023-0026.R1, PubMed 37203362

Dakhil S, Saltvedt I, Benth JŠ, Thingstad P, Watne LO, Bruun Wyller T, Helbostad JL, Frihagen F, Johnsen LG, Taraldsen K (2023)
Longitudinal trajectories of functional recovery after hip fracture
PLoS One, 18 (3), e0283551
DOI 10.1371/journal.pone.0283551, PubMed 36989248

Hassellund SS, Oftebro I, Williksen JH, Søreide E, Madsen JE, Frihagen F (2023)
Closed reduction of dorsally displaced distal radius fractures in the elderly provided improved final radiographic results
J Orthop Surg Res, 18 (1), 247
DOI 10.1186/s13018-023-03733-5, PubMed 36967433

Watne LO, Pollmann CT, Neerland BE, Quist-Paulsen E, Halaas NB, Idland AV, Hassel B, Henjum K, Knapskog AB, Frihagen F, Raeder J, Godø A, Ueland PM, McCann A, Figved W, Selbæk G, Zetterberg H, Fang EF, Myrstad M, Giil LM (2023)
Cerebrospinal fluid quinolinic acid is strongly associated with delirium and mortality in hip-fracture patients
J Clin Invest, 133 (2)
DOI 10.1172/JCI163472, PubMed 36409557

Frihagen F, Comeau-Gauthier M, Axelrod D, Bzovsky S, Poolman R, Heels-Ansdell D, Bhandari M, Sprague S, Schemitsch E, HEALTH Investigators (2022)
Who, if anyone, may benefit from a total hip arthroplasty after a displaced femoral neck fracture?: a post hoc subgroup analysis of the HEALTH trial
Bone Jt Open, 3 (8), 611-617
DOI 10.1302/2633-1462.38.BJO-2022-0074.R1, PubMed 35909342

Bartels S, Kristensen TB, Gjertsen JE, Frihagen F, Rogmark C, Dolatowski FC, Figved W, Benth JŠ, Utvåg SE (2022)
Total Hip Arthroplasty Leads to Better Results After Low-Energy Displaced Femoral Neck Fracture in Patients Aged 55 to 70 Years: A Randomized Controlled Multicenter Trial Comparing Internal Fixation and Total Hip Arthroplasty
J Bone Joint Surg Am, 104 (15), 1341-1351
DOI 10.2106/JBJS.21.01411, PubMed 35700073

Amundsen A, Rizzo M, Berger RA, Houdek MT, Frihagen F, Moran SL (2022)
Twenty-Year Experience With Primary Distal Radioulnar Joint Arthroplasty From a Single Institution
J Hand Surg Am, 48 (1), 53-67
DOI 10.1016/j.jhsa.2022.02.014, PubMed 35550310

Laszlo S, Nilsson M, Pihl E, Mattila VM, Schilcher J, Sköldenberg O, Frihagen F, Jonsson KB (2022)
Proximal Hamstring Tendon Avulsions: A Survey of Orthopaedic Surgeons' Current Practices in the Nordic Countries
Sports Med Open, 8 (1), 49
DOI 10.1186/s40798-022-00439-6, PubMed 35403955

Frihagen F (2022)
How to navigate the landscape of trochanteric hip fracture implants
Acta Orthop, 93, 358-359
DOI 10.2340/17453674.2022.2255, PubMed 35257187

Amundsen A, Rizzo M, Berger R, Frihagen F, Moran SL (2022)
Outcomes following Distal Radioulnar Joint Arthroplasty in the Setting of Total or Partial Wrist Fusion
J Wrist Surg, 11 (6), 501-508
DOI 10.1055/s-0042-1743119, PubMed 36504533

Hassellund S, Zolic-Karlsson Z, Williksen JH, Husby T, Madsen JE, Frihagen F (2021)
Surgical treatment is not cost-effective compared to nonoperative treatment for displaced distal radius fractures in patients 65 years and over
Bone Jt Open, 2 (12), 1027-1034
DOI 10.1302/2633-1462.212.BJO-2021-0108.R1, PubMed 34856811

Ræder BW, Andersen MR, Madsen JE, Jacobsen SB, Frihagen F, Figved W (2021)
Prognostic value of the Haraguchi classification in posterior malleolar fractures in A0 44-C type ankle fractures
Injury, 52 (10), 3150-3155
DOI 10.1016/j.injury.2021.07.038, PubMed 34362561

Comeau-Gauthier M, Zura RD, Bzovsky S, Schemitsch EH, Axelrod D, Avram V, Manjoo A, Poolman RW, Frihagen F, Heels-Ansdell D, Bhandari M, Sprague S, (2021)
Heterotopic Ossification Following Arthroplasty for Femoral Neck Fracture
J Bone Joint Surg Am, 103 (14), 1328-1334
DOI 10.2106/JBJS.20.01586, PubMed 33764913

Henjum K, Godang K, Quist-Paulsen E, Idland AV, Neerland BE, Sandvig H, Brugård A, Raeder J, Frihagen F, Wyller TB, Hassel B, Bollerslev J, Watne LO (2021)
Cerebrospinal fluid catecholamines in delirium and dementia
Brain Commun, 3 (3), fcab121
DOI 10.1093/braincomms/fcab121, PubMed 34423298

Midtgaard KS, Frihagen F, Dornan GJ, Coucheron M, Fossåen C, Grundel D, Gundersen C, Kristoffersen S, Sundqvist E, Wünsche L, Madsen JE, Flugsrud GB (2021)
Predicting secondary surgery after operative fixation of olecranon fractures: a model using data from 800 patients
JSES Int, 5 (5), 948-953
DOI 10.1016/j.jseint.2021.04.014, PubMed 34505111

Dakhil S, Thingstad P, Frihagen F, Johnsen LG, Lydersen S, Skovlund E, Wyller TB, Sletvold O, Saltvedt I, Watne LO (2021)
Orthogeriatrics prevents functional decline in hip fracture patients: report from two randomized controlled trials
BMC Geriatr, 21 (1), 208
DOI 10.1186/s12877-021-02152-7, PubMed 33765935

Ernst G, Watne LO, Frihagen F, Wyller TB, Dominik A, Rostrup M (2021)
Low Heart Rate Variability Predicts Stroke and Other Complications in the First Six Postoperative Months After a Hip Fracture Operation
Front Cardiovasc Med, 8, 640970
DOI 10.3389/fcvm.2021.640970, PubMed 33829048

Hassellund SS, Williksen JH, Laane MM, Pripp A, Rosales CP, Karlsen Ø, Madsen JE, Frihagen F (2021)
Cast immobilization is non-inferior to volar locking plates in relation to QuickDASH after one year in patients aged 65 years and older: a randomized controlled trial of displaced distal radius fractures
Bone Joint J, 103-B (2), 247-255
DOI 10.1302/0301-620X.103B2.BJJ-2020-0192.R2, PubMed 33517725

Alm CE, Frihagen F, Dybvik E, Matre K, Madsen JE, Gjertsen JE (2021)
Implants for trochanteric fractures in Norway: the role of the trochanteric stabilizing plate-a study on 20,902 fractures from the Norwegian hip fracture register 2011-2017
J Orthop Surg Res, 16 (1), 26
DOI 10.1186/s13018-020-02163-x, PubMed 33413527

Nordbø JV, Sivertsen ØS, Frihagen F, Solberg LB (2020)
The role of general practitioners in osteoporosis treatment after fractures
Tidsskr Nor Laegeforen, 140 (17)
DOI 10.4045/tidsskr.20.0822, PubMed 33231400

Ingstad F, Solberg LB, Nordsletten L, Thorsby PM, Hestnes I, Frihagen F (2020)
Vitamin D status and complications, readmissions, and mortality after hip fracture
Osteoporos Int, 32 (5), 873-881
DOI 10.1007/s00198-020-05739-9, PubMed 33201249

Sivaratnam S, Comeau-Gauthier M, Sprague S, Schemitsch EH, Poolman RW, Frihagen F, Bhandari M, Swiontkowski M, Bzovsky S, FAITH Investigators, HEALTH Investigators (2020)
Predictors of Loss to Follow-up in Hip Fracture Trials: A Secondary Analysis of the FAITH and HEALTH Trials
J Orthop Trauma, 34 Suppl 3, S22-S28
DOI 10.1097/BOT.0000000000001928, PubMed 33027162

Blankstein M, Schemitsch EH, Bzovsky S, Axelrod D, Poolman RW, Frihagen F, Bhandari M, Swiontkowski M, Sprague S, Schottel PC, FAITH Investigators, HEALTH Investigators (2020)
The FAITH and HEALTH Trials: Are We Studying Different Hip Fracture Patient Populations?
J Orthop Trauma, 34 Suppl 3, S1-S8
DOI 10.1097/BOT.0000000000001930, PubMed 33027159

Noori A, Sprague S, Bzovsky S, Schemitsch EH, Poolman RW, Frihagen F, Axelrod D, Heels-Ansdell D, Bhandari M, Busse JW, HEALTH Investigators (2020)
Predictors of Long-Term Pain After Hip Arthroplasty in Patients With Femoral Neck Fractures: A Cohort Study
J Orthop Trauma, 34 Suppl 3, S55-S63
DOI 10.1097/BOT.0000000000001929, PubMed 33027167

Axelrod D, Comeau-Gauthier M, Bzovsky S, Schemitsch EH, Poolman RW, Frihagen F, Guerra-Farfán E, Heels-Ansdell D, Bhandari M, Sprague S, HEALTH Investigators (2020)
What Predicts Health-Related Quality of Life for Patients With Displaced Femoral Neck Fractures Managed With Arthroplasty? A Secondary Analysis of the HEALTH Trial
J Orthop Trauma, 34 Suppl 3, S29-S36
DOI 10.1097/BOT.0000000000001933, PubMed 33027163

Afaq S, OʼHara NN, Schemitsch EH, Bzovsky S, Sprague S, Poolman RW, Frihagen F, Heels-Ansdell D, Bhandari M, Swiontkowski M, Slobogean GP, FAITH Investigators, HEALTH Investigators (2020)
Arthroplasty Versus Internal Fixation for the Treatment of Undisplaced Femoral Neck Fractures: A Retrospective Cohort Study
J Orthop Trauma, 34 Suppl 3, S9-S14
DOI 10.1097/BOT.0000000000001940, PubMed 33027160

MacDonald DRW, Neilly D, Schneider PS, Bzovsky S, Sprague S, Axelrod D, Poolman RW, Frihagen F, Bhandari M, Swiontkowski M, Schemitsch EH, Stevenson IM, FAITH Investigators, HEALTH Investigators (2020)
Venous Thromboembolism in Hip Fracture Patients: A Subanalysis of the FAITH and HEALTH Trials
J Orthop Trauma, 34 Suppl 3, S70-S75
DOI 10.1097/BOT.0000000000001939, PubMed 33027169

Neilly D, MacDonald DRW, Sprague S, Bzovsky S, Axelrod D, Poolman RW, Frihagen F, Heels-Ansdell D, Bhandari M, Schemitsch EH, Stevenson IM, HEALTH Investigators (2020)
Predictors of Medical Serious Adverse Events in Hip Fracture Patients Treated With Arthroplasty
J Orthop Trauma, 34 Suppl 3, S42-S48
DOI 10.1097/BOT.0000000000001935, PubMed 33027165

Bzovsky S, Comeau-Gauthier M, Schemitsch EH, Swiontkowski M, Heels-Ansdell D, Frihagen F, Bhandari M, Sprague S, FAITH Investigators, HEALTH Investigators (2020)
Factors Associated With Mortality After Surgical Management of Femoral Neck Fractures
J Orthop Trauma, 34 Suppl 3, S15-S21
DOI 10.1097/BOT.0000000000001937, PubMed 33027161

Frihagen F, Madsen JE, Sundfeldt M, Flugsrud GB, Andreassen JS, Andersen MR, Andreassen GS (2020)
Taylor Spatial Frame or Reamed Intramedullary Nailing for Closed Fractures of the Tibial Shaft: A Randomized Controlled Trial
J Orthop Trauma, 34 (11), 612-619
DOI 10.1097/BOT.0000000000001802, PubMed 33065663

Blankstein M, Schemitsch EH, Bzovsky S, Poolman RW, Frihagen F, Axelrod D, Heels-Ansdell D, Bhandari M, Sprague S, Schottel PC, HEALTH Investigators (2020)
What Factors Increase Revision Surgery Risk When Treating Displaced Femoral Neck Fractures With Arthroplasty: A Secondary Analysis of the HEALTH Trial
J Orthop Trauma, 34 Suppl 3, S49-S54
DOI 10.1097/BOT.0000000000001936, PubMed 33027166

Ræder BW, Stake IK, Madsen JE, Frihagen F, Jacobsen SB, Andersen MR, Figved W (2020)
Randomized trial comparing suture button with single 3.5 mm syndesmotic screw for ankle syndesmosis injury: similar results at 2 years
Acta Orthop, 91 (6), 770-775
DOI 10.1080/17453674.2020.1818175, PubMed 32907456

Ræder BW, Figved W, Madsen JE, Frihagen F, Jacobsen SB, Andersen MR (2020)
Better outcome for suture button compared with single syndesmotic screw for syndesmosis injury: five-year results of a randomized controlled trial
Bone Joint J, 102-B (2), 212-219
DOI 10.1302/0301-620X.102B2.BJJ-2019-0692.R2, PubMed 32009435

Svenøy S, Watne LO, Hestnes I, Westberg M, Madsen JE, Frihagen F (2020)
Results after introduction of a hip fracture care pathway: comparison with usual care
Acta Orthop, 91 (2), 139-145
DOI 10.1080/17453674.2019.1710804, PubMed 31928088

Borgen TT, Bjørnerem Å, Solberg LB, Andreasen C, Brunborg C, Stenbro MB, Hübschle LM, Figved W, Apalset EM, Gjertsen JE, Basso T, Lund I, Hansen AK, Stutzer JM, Dahl C, Nordsletten L, Frihagen F, Eriksen EF (2019)
Determinants of trabecular bone score and prevalent vertebral fractures in women with fragility fractures: a cross-sectional sub-study of NoFRACT
Osteoporos Int, 31 (3), 505-514
DOI 10.1007/s00198-019-05215-z, PubMed 31754755

HEALTH Investigators, Bhandari M, Einhorn TA, Guyatt G, Schemitsch EH, Zura RD, Sprague S, Frihagen F, Guerra-Farfán E, Kleinlugtenbelt YV, Poolman RW, Rangan A, Bzovsky S, Heels-Ansdell D, Thabane L, Walter SD, Devereaux PJ (2019)
Total Hip Arthroplasty or Hemiarthroplasty for Hip Fracture
N Engl J Med, 381 (23), 2199-2208
DOI 10.1056/NEJMoa1906190, PubMed 31557429

Pihl E, Kristoffersen MH, Rosenlund AM, Laszlo S, Berglöf M, Ribom E, Eriksson K, Frihagen F, Mattila VM, Schilcher J, Eklund M, Snellman G, Skorpil M, Sköldenberg O, Hedbeck CJ, Jonsson K (2019)
The proximal hamstring avulsion clinical trial (PHACT)-a randomised controlled non-inferiority trial of operative versus non-operative treatment of proximal hamstrings avulsions: study protocol
BMJ Open, 9 (9), e031607
DOI 10.1136/bmjopen-2019-031607, PubMed 31519683

Borgen TT, Bjørnerem Å, Solberg LB, Andreasen C, Brunborg C, Stenbro MB, Hübschle LM, Froholdt A, Figved W, Apalset EM, Gjertsen JE, Basso T, Lund I, Hansen AK, Stutzer JM, Omsland TK, Nordsletten L, Frihagen F, Eriksen EF (2019)
Post-fracture Risk Assessment: Target the Centrally Sited Fractures First! A Substudy of NoFRACT
J Bone Miner Res, 34 (11), 2036-2044
DOI 10.1002/jbmr.3827, PubMed 31310352

Bartels S, Gjertsen JE, Frihagen F, Rogmark C, Utvåg SE (2019)
Low bone density and high morbidity in patients between 55 and 70 years with displaced femoral neck fractures: a case-control study of 50 patients vs 150 normal controls
BMC Musculoskelet Disord, 20 (1), 371
DOI 10.1186/s12891-019-2732-8, PubMed 31409337

Andersen MR, Diep LM, Frihagen F, Castberg Hellund J, Madsen JE, Figved W (2019)
Importance of Syndesmotic Reduction on Clinical Outcome After Syndesmosis Injuries
J Orthop Trauma, 33 (8), 397-403
DOI 10.1097/BOT.0000000000001485, PubMed 30973504

Ranhoff AH, Saltvedt I, Frihagen F, Raeder J, Maini S, Sletvold O (2019)
Interdisciplinary care of hip fractures.: Orthogeriatric models, alternative models, interdisciplinary teamwork
Best Pract Res Clin Rheumatol, 33 (2), 205-226
DOI 10.1016/j.berh.2019.03.015, PubMed 31547979

Frisvoll C, Clarke-Jenssen J, Madsen JE, Flugsrud G, Frihagen F, Andreassen GS, Bere T (2019)
Long-term outcomes after high-energy open tibial fractures: Is a salvaged limb superior to prosthesis in terms of physical function and quality of life?
Eur J Orthop Surg Traumatol, 29 (4), 899-906
DOI 10.1007/s00590-019-02382-x, PubMed 30756177

Borgen TT, Bjørnerem Å, Solberg LB, Andreasen C, Brunborg C, Stenbro MB, Hübschle LM, Froholdt A, Figved W, Apalset EM, Gjertsen JE, Basso T, Lund I, Hansen AK, Stutzer JM, Dahl C, Omsland TK, Nordsletten L, Frihagen F, Eriksen EF (2019)
High prevalence of vertebral fractures and low trabecular bone score in patients with fragility fractures: A cross-sectional sub-study of NoFRACT
Bone, 122, 14-21
DOI 10.1016/j.bone.2019.02.008, PubMed 30743015

Dolatowski FC, Frihagen F, Bartels S, Opland V, Šaltytė Benth J, Talsnes O, Hoelsbrekken SE, Utvåg SE (2019)
Screw Fixation Versus Hemiarthroplasty for Nondisplaced Femoral Neck Fractures in Elderly Patients: A Multicenter Randomized Controlled Trial
J Bone Joint Surg Am, 101 (2), 136-144
DOI 10.2106/JBJS.18.00316, PubMed 30653043

Andreasen C, Solberg LB, Basso T, Borgen TT, Dahl C, Wisløff T, Hagen G, Apalset EM, Gjertsen JE, Figved W, Hübschle LM, Stutzer JM, Elvenes J, Joakimsen RM, Syversen U, Eriksen EF, Nordsletten L, Frihagen F, Omsland TK, Bjørnerem Å (2018)
Effect of a Fracture Liaison Service on the Rate of Subsequent Fracture Among Patients With a Fragility Fracture in the Norwegian Capture the Fracture Initiative (NoFRACT): A Trial Protocol
JAMA Netw Open, 1 (8), e185701
DOI 10.1001/jamanetworkopen.2018.5701, PubMed 30646281

Torbergsen AC, Watne LO, Frihagen F, Wyller TB, Mowè M (2018)
Effects of nutritional intervention upon bone turnover in elderly hip fracture patients. Randomized controlled trial
Clin Nutr ESPEN, 29, 52-58
DOI 10.1016/j.clnesp.2017.11.012, PubMed 30661701

Hassel B, Mariussen E, Idland AV, Dahl GT, Ræder J, Frihagen F, Berg JP, Chaudhry FA, Wyller TB, Watne LO (2018)
CSF sodium at toxic levels precedes delirium in hip fracture patients
Neurotoxicology, 69, 11-16
DOI 10.1016/j.neuro.2018.08.010, PubMed 30149051

Figved W, Svenøy S, Röhrl SM, Dahl J, Nordsletten L, Frihagen F (2018)
Higher cartilage wear in unipolar than bipolar hemiarthroplasties of the hip at 2 years: A randomized controlled radiostereometric study in 19 fit elderly patients with femoral neck fractures
Acta Orthop, 89 (5), 503-508
DOI 10.1080/17453674.2018.1475899, PubMed 29790397

Andersen MR, Frihagen F, Hellund JC, Madsen JE, Figved W (2018)
Randomized Trial Comparing Suture Button with Single Syndesmotic Screw for Syndesmosis Injury
J Bone Joint Surg Am, 100 (1), 2-12
DOI 10.2106/JBJS.16.01011, PubMed 29298255

Halaas NB, Blennow K, Idland AV, Wyller TB, Ræder J, Frihagen F, Staff AC, Zetterberg H, Watne LO (2018)
Neurofilament Light in Serum and Cerebrospinal Fluid of Hip Fracture Patients with Delirium
Dement Geriatr Cogn Disord, 46 (5-6), 346-357
DOI 10.1159/000494754, PubMed 30522125

Hov KR, Bolstad N, Idland AV, Zetterberg H, Blennow K, Chaudhry FA, Frihagen F, Ræder J, Wyller TB, Watne LO (2017)
Cerebrospinal Fluid S100B and Alzheimer's Disease Biomarkers in Hip Fracture Patients with Delirium
Dement Geriatr Cogn Dis Extra, 7 (3), 374-385
DOI 10.1159/000481853, PubMed 29282410

Idland AV, Wyller TB, Støen R, Dahl GT, Frihagen F, Brækhus A, Hassel B, Watne LO (2017)
Cerebrospinal Fluid Phosphate in Delirium after Hip Fracture
Dement Geriatr Cogn Dis Extra, 7 (3), 309-317
DOI 10.1159/000478723, PubMed 29118783

Bartels S, Gjertsen JE, Frihagen F, Rogmark C, Utvåg SE (2017)
High failure rate after internal fixation and beneficial outcome after arthroplasty in treatment of displaced femoral neck fractures in patients between 55 and 70 years
Acta Orthop, 89 (1), 53-58
DOI 10.1080/17453674.2017.1376514, PubMed 28914130

Ernst G, Watne LO, Frihagen F, Wyller TB, Dominik A, Rostrup M (2017)
Decreases in heart rate variability are associated with postoperative complications in hip fracture patients
PLoS One, 12 (7), e0180423
DOI 10.1371/journal.pone.0180423, PubMed 28742855

Neerland BE, Krogseth M, Juliebø V, Hylen Ranhoff A, Engedal K, Frihagen F, Ræder J, Bruun Wyller T, Watne LO (2017)
Perioperative hemodynamics and risk for delirium and new onset dementia in hip fracture patients; A prospective follow-up study
PLoS One, 12 (7), e0180641
DOI 10.1371/journal.pone.0180641, PubMed 28700610

Svenøy S, Westberg M, Figved W, Valland H, Brun OC, Wangen H, Madsen JE, Frihagen F (2017)
Posterior versus lateral approach for hemiarthroplasty after femoral neck fracture: Early complications in a prospective cohort of 583 patients
Injury, 48 (7), 1565-1569
DOI 10.1016/j.injury.2017.03.024, PubMed 28465004

Guren E, Figved W, Frihagen F, Watne LO, Westberg M (2017)
Prosthetic joint infection-a devastating complication of hemiarthroplasty for hip fracture
Acta Orthop, 88 (4), 383-389
DOI 10.1080/17453674.2017.1301009, PubMed 28271919

Malouf-Sierra J, Tarantino U, García-Hernández PA, Corradini C, Overgaard S, Stepan JJ, Borris L, Lespessailles E, Frihagen F, Papavasiliou K, Petto H, Aspenberg P, Caeiro JR, Marin F (2017)
Effect of Teriparatide or Risedronate in Elderly Patients With a Recent Pertrochanteric Hip Fracture: Final Results of a 78-Week Randomized Clinical Trial
J Bone Miner Res, 32 (5), 1040-1051
DOI 10.1002/jbmr.3067, PubMed 28019683

Idland AV, Wyller TB, Støen R, Eri LM, Frihagen F, Ræder J, Chaudhry FA, Hansson O, Zetterberg H, Blennow K, Bogdanovic N, Brækhus A, Watne LO (2017)
Preclinical Amyloid-β and Axonal Degeneration Pathology in Delirium
J Alzheimers Dis, 55 (1), 371-379
DOI 10.3233/JAD-160461, PubMed 27662296

Tsukanaka M, Støen RØ, Figved W, Frihagen F, Nordsletten L, Röhrl SM (2016)
Steady state acetabular cartilage wear after bipolar hemiarthroplasty: a case series of 10 patients with radiostereometric analysis
Hip Int, 27 (2), 193-197
DOI 10.5301/hipint.5000437, PubMed 27911454

Aspenberg P, Malouf J, Tarantino U, García-Hernández PA, Corradini C, Overgaard S, Stepan JJ, Borris L, Lespessailles E, Frihagen F, Papavasiliou K, Petto H, Caeiro JR, Marin F (2016)
Effects of Teriparatide Compared with Risedronate on Recovery After Pertrochanteric Hip Fracture: Results of a Randomized, Active-Controlled, Double-Blind Clinical Trial at 26 Weeks
J Bone Joint Surg Am, 98 (22), 1868-1878
DOI 10.2106/JBJS.15.01217, PubMed 27852903

Watne LO, Idland AV, Fekkes D, Raeder J, Frihagen F, Ranhoff AH, Chaudhry FA, Engedal K, Wyller TB, Hassel B (2016)
Increased CSF levels of aromatic amino acids in hip fracture patients with delirium suggests higher monoaminergic activity
BMC Geriatr, 16, 149
DOI 10.1186/s12877-016-0324-0, PubMed 27484129

Hall RJ, Watne LO, Idland AV, Raeder J, Frihagen F, MacLullich AM, Staff AC, Wyller TB, Fekkes D (2016)
Cerebrospinal fluid levels of neopterin are elevated in delirium after hip fracture
J Neuroinflammation, 13 (1), 170
DOI 10.1186/s12974-016-0636-1, PubMed 27357281

Neerland BE, Hall RJ, Seljeflot I, Frihagen F, MacLullich AM, Raeder J, Wyller TB, Watne LO (2016)
Associations Between Delirium and Preoperative Cerebrospinal Fluid C-Reactive Protein, Interleukin-6, and Interleukin-6 Receptor in Individuals with Acute Hip Fracture
J Am Geriatr Soc, 64 (7), 1456-63
DOI 10.1111/jgs.14238, PubMed 27341529

Dolatowski FC, Adampour M, Frihagen F, Stavem K, Erik Utvåg S, Hoelsbrekken SE (2016)
Preoperative posterior tilt of at least 20° increased the risk of fixation failure in Garden-I and -II femoral neck fractures
Acta Orthop, 87 (3), 252-6
DOI 10.3109/17453674.2016.1155253, PubMed 26937557

Hov KR, Berg JP, Frihagen F, Ræder J, Hall R, Wyller TB, Watne LO (2016)
Blood-Cerebrospinal Fluid Barrier Integrity in Delirium Determined by Q-Albumin
Dement Geriatr Cogn Disord, 41 (3-4), 192-8
DOI 10.1159/000443789, PubMed 27058253

Krogseth M, Watne LO, Juliebø V, Skovlund E, Engedal K, Frihagen F, Wyller TB (2015)
Delirium is a risk factor for further cognitive decline in cognitively impaired hip fracture patients
Arch Gerontol Geriatr, 64, 38-44
DOI 10.1016/j.archger.2015.12.004, PubMed 26952375

Torbergsen AC, Watne LO, Wyller TB, Frihagen F, Strømsøe K, Bøhmer T, Mowe M (2015)
Micronutrients and the risk of hip fracture: Case-control study
Clin Nutr, 36 (2), 438-443
DOI 10.1016/j.clnu.2015.12.014, PubMed 26795217

Slobogean GP, Giannoudis PV, Frihagen F, Forte ML, Morshed S, Bhandari M (2015)
Bigger Data, Bigger Problems
J Orthop Trauma, 29 Suppl 12, S43-6
DOI 10.1097/BOT.0000000000000463, PubMed 26584266

Andersen MR, Frihagen F, Madsen JE, Figved W (2015)
High complication rate after syndesmotic screw removal
Injury, 46 (11), 2283-7
DOI 10.1016/j.injury.2015.08.021, PubMed 26319204

Torbergsen AC, Watne LO, Frihagen F, Wyller TB, Brugaard A, Mowe M (2015)
Vitamin deficiency as a risk factor for delirium
Eur. Geriatr. Med., 6 (4), 314-318
DOI 10.1016/j.eurger.2014.09.002

Williksen JH, Husby T, Hellund JC, Kvernmo HD, Rosales C, Frihagen F (2015)
External Fixation and Adjuvant Pins Versus Volar Locking Plate Fixation in Unstable Distal Radius Fractures: A Randomized, Controlled Study With a 5-Year Follow-Up
J Hand Surg Am, 40 (7), 1333-40
DOI 10.1016/j.jhsa.2015.03.008, PubMed 25914018

Westberg M, Frihagen F, Brun OC, Figved W, Grøgaard B, Valland H, Wangen H, Snorrason F (2015)
Effectiveness of gentamicin-containing collagen sponges for prevention of surgical site infection after hip arthroplasty: a multicenter randomized trial
Clin Infect Dis, 60 (12), 1752-9
DOI 10.1093/cid/civ162, PubMed 25737375

Bhandari M, Devereaux PJ, Einhorn TA, Thabane L, Schemitsch EH, Koval KJ, Frihagen F, Poolman RW, Tetsworth K, Guerra-Farfán E, Madden K, Sprague S, Guyatt G, HEALTH Investigators (2015)
Hip fracture evaluation with alternatives of total hip arthroplasty versus hemiarthroplasty (HEALTH): protocol for a multicentre randomised trial
BMJ Open, 5 (2), e006263
DOI 10.1136/bmjopen-2014-006263, PubMed 25681312

Watne LO, Torbergsen AC, Conroy S, Engedal K, Frihagen F, Hjorthaug GA, Juliebo V, Raeder J, Saltvedt I, Skovlund E, Wyller TB (2014)
The effect of a pre- and postoperative orthogeriatric service on cognitive function in patients with hip fracture: randomized controlled trial (Oslo Orthogeriatric Trial)
BMC Med, 12, 63
DOI 10.1186/1741-7015-12-63, PubMed 24735588

Torbergsen AC, Watne LO, Wyller TB, Frihagen F, Strømsøe K, Bøhmer T, Mowe M (2014)
Vitamin K1 and 25(OH)D are independently and synergistically associated with a risk for hip fracture in an elderly population: a case control study
Clin Nutr, 34 (1), 101-6
DOI 10.1016/j.clnu.2014.01.016, PubMed 24559841

Watne LO, Hall RJ, Molden E, Raeder J, Frihagen F, MacLullich AM, Juliebø V, Nyman A, Meagher D, Wyller TB (2014)
Anticholinergic activity in cerebrospinal fluid and serum in individuals with hip fracture with and without delirium
J Am Geriatr Soc, 62 (1), 94-102
DOI 10.1111/jgs.12612, PubMed 24383557

Langslet E, Frihagen F, Opland V, Madsen JE, Nordsletten L, Figved W (2013)
Cemented versus uncemented hemiarthroplasty for displaced femoral neck fractures: 5-year followup of a randomized trial
Clin Orthop Relat Res, 472 (4), 1291-9
DOI 10.1007/s11999-013-3308-9, PubMed 24081667

Skaara HE, Moksnes H, Frihagen F, Stuge B (2013)
Self-reported and performance-based functional outcomes after surgical repair of proximal hamstring avulsions
Am J Sports Med, 41 (11), 2577-84
DOI 10.1177/0363546513499518, PubMed 23989349

Støen RØ, Lofthus CM, Nordsletten L, Madsen JE, Frihagen F (2013)
Randomized trial of hemiarthroplasty versus internal fixation for femoral neck fractures: no differences at 6 years
Clin Orthop Relat Res, 472 (1), 360-7
DOI 10.1007/s11999-013-3245-7, PubMed 23975250

Williksen JH, Frihagen F, Hellund JC, Kvernmo HD, Husby T (2013)
Volar locking plates versus external fixation and adjuvant pin fixation in unstable distal radius fractures: a randomized, controlled study
J Hand Surg Am, 38 (8), 1469-76
DOI 10.1016/j.jhsa.2013.04.039, PubMed 23890493

Westberg M, Snorrason F, Frihagen F (2013)
Preoperative waiting time increased the risk of periprosthetic infection in patients with femoral neck fracture
Acta Orthop, 84 (2), 124-9
DOI 10.3109/17453674.2013.775044, PubMed 23418949

Wyller TB, Watne LO, Torbergsen A, Engedal K, Frihagen F, Juliebø V, Saltvedt I, Skovlund E, Ræder J, Conroy S (2012)
The effect of a pre- and post-operative orthogeriatric service on cognitive function in patients with hip fracture. The protocol of the Oslo Orthogeriatrics Trial
BMC Geriatr, 12, 36
DOI 10.1186/1471-2318-12-36, PubMed 22817102

Schizas N, Weiss R, Lian O, Frihagen F, Bahr R, Ackermann PW (2012)
Glutamate receptors in tendinopathic patients
J Orthop Res, 30 (9), 1447-52
DOI 10.1002/jor.22094, PubMed 22354721

Figved W, Dahl J, Snorrason F, Frihagen F, Röhrl S, Madsen JE, Nordsletten L (2011)
Radiostereometric analysis of hemiarthroplasties of the hip--a highly precise method for measurements of cartilage wear
Osteoarthritis Cartilage, 20 (1), 36-42
DOI 10.1016/j.joca.2011.11.006, PubMed 22126919

Waaler Bjørnelv GM, Frihagen F, Madsen JE, Nordsletten L, Aas E (2011)
Hemiarthroplasty compared to internal fixation with percutaneous cannulated screws as treatment of displaced femoral neck fractures in the elderly: cost-utility analysis performed alongside a randomized, controlled trial
Osteoporos Int, 23 (6), 1711-9
DOI 10.1007/s00198-011-1772-1, PubMed 21997224

Robstad B, Frihagen F, Nordsletten L (2011)
The rate of hip osteoarthritis in patients with proximal femoral fractures versus hip contusion
Osteoporos Int, 23 (3), 901-5
DOI 10.1007/s00198-011-1628-8, PubMed 21625883

Frihagen F, Waaler GM, Madsen JE, Nordsletten L, Aspaas S, Aas E (2010)
The cost of hemiarthroplasty compared to that of internal fixation for femoral neck fractures. 2-year results involving 222 patients based on a randomized controlled trial
Acta Orthop, 81 (4), 446-52
DOI 10.3109/17453674.2010.492763, PubMed 20515432

Schizas N, Lian Ø, Frihagen F, Engebretsen L, Bahr R, Ackermann PW (2009)
Coexistence of up-regulated NMDA receptor 1 and glutamate on nerves, vessels and transformed tenocytes in tendinopathy
Scand J Med Sci Sports, 20 (2), 208-15
DOI 10.1111/j.1600-0838.2009.00913.x, PubMed 19422642

Figved W, Opland V, Frihagen F, Jervidalo T, Madsen JE, Nordsletten L (2009)
Cemented versus uncemented hemiarthroplasty for displaced femoral neck fractures
Clin Orthop Relat Res, 467 (9), 2426-35
DOI 10.1007/s11999-008-0672-y, PubMed 19130162

Frihagen F, Grotle M, Madsen JE, Wyller TB, Mowinckel P, Nordsletten L (2008)
Outcome after femoral neck fractures: a comparison of Harris Hip Score, Eq-5d and Barthel Index
Injury, 39 (10), 1147-56
DOI 10.1016/j.injury.2008.03.027, PubMed 18656868

Lofthus CM, Frihagen F, Meyer HE, Nordsletten L, Melhuus K, Falch JA (2008)
Epidemiology of distal forearm fractures in Oslo, Norway
Osteoporos Int, 19 (6), 781-6
DOI 10.1007/s00198-007-0499-5, PubMed 17985071

Frihagen F, Nordsletten L, Madsen JE (2007)
Hemiarthroplasty or internal fixation for intracapsular displaced femoral neck fractures: randomised controlled trial
BMJ, 335 (7632), 1251-4
DOI 10.1136/bmj.39399.456551.25, PubMed 18056740

Figved W, Dybvik E, Frihagen F, Furnes O, Madsen JE, Havelin LI, Nordsletten L (2007)
Conversion from failed hemiarthroplasty to total hip arthroplasty: a Norwegian Arthroplasty Register analysis of 595 hips with previous femoral neck fractures
Acta Orthop, 78 (6), 711-8
DOI 10.1080/17453670710014473, PubMed 18236176

Frihagen F, Madsen JE, Reinholt FP, Nordsletten L (2007)
Screw augmentation in displaced femoral neck fractures. Clinical and histological results using a new composite
Injury, 38 (7), 797-805
DOI 10.1016/j.injury.2007.03.005, PubMed 17544427

Frihagen F, Madsen JE, Aksnes E, Bakken HN, Maehlum T, Walløe A, Nordsletten L (2006)
Comparison of re-operation rates following primary and secondary hemiarthroplasty of the hip
Injury, 38 (7), 815-9
DOI 10.1016/j.injury.2006.09.020, PubMed 17145058

Lian Ø, Dahl J, Ackermann PW, Frihagen F, Engebretsen L, Bahr R (2006)
Pronociceptive and antinociceptive neuromediators in patellar tendinopathy
Am J Sports Med, 34 (11), 1801-8
DOI 10.1177/0363546506289169, PubMed 16816149

Figved W, Norum OJ, Frihagen F, Madsen JE, Nordsletten L (2006)
Interprosthetic dislocations of the Charnley/Hastings hemiarthroplasty--report of 11 cases in 350 consecutive patients
Injury, 37 (2), 157-61
DOI 10.1016/j.injury.2005.07.005, PubMed 16426612

Frihagen F, Nordsletten L, Tariq R, Madsen JE (2005)
MRI diagnosis of occult hip fractures
Acta Orthop, 76 (4), 524-30
DOI 10.1080/17453670510041510, PubMed 16195069

Frihagen F, Kvakestad R, Melhuus K, Engebretsen L (2003)
[Use of MR examination in knee injuries]
Tidsskr Nor Laegeforen, 123 (7), 944-5
PubMed 12737069

Kvakestad R, Frihagen F, Melhuus K, Engebretsen L (2003)
[Knee injuries in the Oslo emergency ward]
Tidsskr Nor Laegeforen, 123 (3), 322-4
PubMed 12640899

Frihagen F, Kvakestad R, Melhuus K, Engebretsen L (2002)
The use of MRI scan of knee injuries in an emergency department
Scand J Med Sci Sports, 12 (3), 150-3
DOI 10.1034/j.1600-0838.2002.02132.x, PubMed 12135447

Frihagen F, Hjortdahl P, Kvamme OJ (1999)
[Communication between general practitioners and hospital interns at emergency admissions]
Tidsskr Nor Laegeforen, 119 (15), 2168-72
PubMed 10402909

Frihagen F, Hjortdahl P, Kvamme OJ (1999)
[The first telephone call at emergency admissions--the role of nurses]
Tidsskr Nor Laegeforen, 119 (15), 2173-6
PubMed 10402910

Frihagen F (1992)
[Harvard Medical School]
Tidsskr Nor Laegeforen, 112 (2), 236-7
PubMed 1566264

Review articles

Sermon A, Slock C, Coeckelberghs E, Seys D, Panella M, Bruyneel L, Nijs S, Akiki A, Castillon P, Chipperfield A, El Attal R, Foss NB, Frihagen F, Gerich TG, Gümbel D, Kanakaris N, Kristensen MT, Malchau I, Palm H, Pape HC, Vanhaecht K (2021)
Quality indicators in the treatment of geriatric hip fractures: literature review and expert consensus
Arch Osteoporos, 16 (1), 152
DOI 10.1007/s11657-021-00995-6, PubMed 34625842

Alm CE, Gjertsen JE, Basso T, Matre K, Rörhl S, Madsen JE, Frihagen F (2021)
Trochanteric stabilizing plate in the treatment of trochanteric fractures: a scoping review
Acta Orthop, 92 (6), 733-738
DOI 10.1080/17453674.2021.1954305, PubMed 34296661

Figved W, Myrstad M, Saltvedt I, Finjarn M, Flaten Odland LM, Frihagen F (2019)
Team Approach: Multidisciplinary Treatment of Hip Fractures in Elderly Patients: Orthogeriatric Care
JBJS Rev, 7 (6), e6
DOI 10.2106/JBJS.RVW.18.00136, PubMed 31219999

Frihagen F, Figved W, Madsen JE, Lofthus CM, Støen RØ, Nordsletten L (2010)
[The treatment of femoral neck fractures]
Tidsskr Nor Laegeforen, 130 (16), 1614-7
DOI 10.4045/tidsskr.09.1264, PubMed 20805859

Heetveld MJ, Rogmark C, Frihagen F, Keating J (2009)
Internal fixation versus arthroplasty for displaced femoral neck fractures: what is the evidence?
J Orthop Trauma, 23 (6), 395-402
DOI 10.1097/BOT.0b013e318176147d, PubMed 19550224

Frihagen F (2009)
On the diagnosis and treatment of femoral neck fractures
Acta Orthop Suppl, 80 (335), 1-26
DOI 10.1080/17453690610046611, PubMed 19919380