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• ​Snaebjörnsson T, Hamrin Senorski E, Svantesson E, Westin O, Persson A, Karlsson J, Samuelsson K. Graft fixation and timing of surgery are predictors of early anterior cruciate ligament revision: A cohort study from the Swedish and Norwegian knee ligament registries based on 18,425 patients. JB JS Open Access. 2019 Dec 12;4(4):e0037.

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• Snaebjörnsson T, Svantesson E, Sundemo D, Westin O, Sansone M, Engebretsen L, Hamrin-Senorski E. Young age and high BMI are predictors of early revision surgery after primary anterior cruciate ligament reconstruction: a cohort study from the Swedish and Norwegian knee ligament registries based on 30,747 patients. Knee Surg Sports Traumatol Arthrosc. 2019 Nov;27(11):3583-3591.

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• ​Snaebjörnsson T, Hamrin-Senorski E, Svantesson E, Karlsson L, Engebretsen L, Karlsson J, Samuelsson K. Graft diameter and graft type as predictors of anterior cruciate ligament revision: A cohort study including 18,425 patients from the Swedish and Norwegian national knee ligament registries. J Bone Joint Surg Am. 2019 Oct 16;101(20):1812-1820.

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• Lie MM, Risberg MA, Storheim K, Engebretsen L, Øiestad BE. What`s the rate of knee osteoarthritis 10 years after anterior cruciate ligament injury? An updated systematic review. Br J Sports Med. 2019 Sep;53(18):1162-1167.

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• Vap AR, Persson A, Fenstad AM, Moatshe G, LaPrade RF, Engebretsen L. Re-revision anterior cruciate ligament reconstruction: An evaluation from the Norwegian knee ligament registry. Arthroscopy. 2019 Apr 30;35(6):1695-1701.

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• Hamrin Senorski E, Svantesson E, Engebretsen L, Lind M, Forssblad M, Karlsson J, Samuelsson K. 15 years of the Scandinavian knee ligament registries: lessons, limitations and likely prospects. Br J Sports Med. 2019 Apr 9;53(20):1259-1260.

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• Inderhaug E, Drogseth JO, Lygre SHL, Gifstad T. No effect of graft size or body mass index on risk of revision after ACL reconstruction using hamstrings autograft. Knee Surg Sports Traumatol Arthrosc. 2019 Feb 7;28(3):707-713.

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• Owesen C, Røtterud JH, Engebretsen L, Årøen A. Effect of activity at time of injury and concomitat ligament injuries on patient-reported outcome after posterior cruciate ligament reconstruction. Orthop J Sports Med. 2018 Dec 28;6(12):2325967118817297.

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• Aga C, Risberg MA, Fagerland MW, Johansen S, Trøan I, Heir S, Engebretsen L. No difference in the KOOS quality of life subscore between anatomic double-bundle and anatomic single-bundle anterior cruciate ligament reconstruction of the knee: A prospective randomized controlled trial with 2 yeas follow-up. Am J Sports Med. 2018 Aug;46(10):2341-2354.

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• Ulstein S, Årøen A, Engebretsen L, Forssblad M, Lygre SHL, Røtterud JH. A controlled comparison of microfracture, debridement, and no treatment of concomitant full-thickness cartilage lesion in anterior cruciate ligament-reconstructed knees: A nationwide prospective cohort study from Norway and Sweden of 368 patients with 5-year follow-up. Orthop J Sports Med. 2018 Aug 1;6(8):2325967118787767.

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• Ulstein S, Årøen A, Engebretsen L, Forssblad M, Lygre SHL, Røtterud JH. Effect of concomitant cartilage lesions on patient-reported outcomes after anterior cruciate ligament reconstruction: A nationwide cohort study from Norway and Sweden of 8470 patients with 5-year follow-up. Orthop J Sports Med. 2018 Jul 24;6(7):2325967118786219.

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• Hamrin SE, Svantesson E, Baldari A, Ayeni OR, Engebretsen L, Franceschi F, Karlsson J, Samuelsson K. Factors that affect patient reported outcome after anterior cruciate ligament reconstruction- a systematic review of the Scandinavian knee ligament registers. Br J Sports Med. 2018 Jul 20; 53(7):410-417.

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• Svantesson E, Hamrin SE, Baldari A, Ayeni OR, Engebretsen L, Franceschi F, Karlsson J, Samuelsson K. Factors associated with additional anterior cruciate ligament reconstruction and register comparison: a systematic review on the Scandinavian knee ligament registers. Br J Sports Med. 2018 Jul 17; 53(7):418-425.

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• Prentice HA, Lind M, Mouton C, Persson A, Magnusson H, Gabr A, Seil R, Engebretsen L, Samuelsson K, Karlsson J, Forssblad M, Haddad FS, Spalding T, Funahashi TT, Paxton LW, Maletis GB. Patient demographic and surgical characteristics in anterior cruciate ligament reconstruction; a description of registries from six countries. Br J Sports Med. 2018 Jun;52(11):716-722.

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• Orchard JW, Engebretsen L, Feller JA. The rate of anterior cruciate ligament reconstruction in Australia is high: a national registry is needed. Med J Aust. 2018 May 7;208(8):341-342.

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• Ingelsrud LH, Terwee CB, Terluin B, Granan LP, Engebretsen L, Mills KAG, Roos EM. Meaningful change scores in the knee injury and osteoarthritis outcome score in patients undergoing anterior cruciate ligament reconstruction. Am J Sports Med. 2018 Apr;46(5):1120-1128.

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• Randsborg PH, Bukholm IRK, Jakobsen RB. Compensation after treatment for anterior cruciate ligament injuries: a review of compensation claims in Norway from 2005 to 2015. Knee Surg Sports Traumatol Arthrosc. 2018 Feb;26(2):628-633.

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• Owesen C, Aas E, Årøen A. Surgical reconstruction is a cost-efficient treatment option for isolated PCL injuries. Knee Surg Sports Traumatol Arthrosc. 2017 Jul 14;26(4):1053-1058.

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• Engen CN, Årøen A, Engebretsen L. Development of a pilot cartilage surgery register. BMC Musculoskelet Disord. 2017 Jun 30;18(1):282.

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• Persson A, Gifstad T, Lind M, Engebretsen L, Fjeldsgaard K, Drogset JO, Forssblad M, Espehaug B, Kjellsen AB, Fevang JM. Graft fixation influences revision risk after ACL reconstruction with hamstring tendon autografts. Acta Orthop. 2017 Nov 24:89(2): 204-210.

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• Aga C, Kartus JT, Lind M, Lygre SHL, Granan LP, Engebretsen L. Risk of revision was not reduced by a double-bundle ACL reconstruction technique: Results from the Scandinavian registers. Clin Orthop Relat Res. 2017 Oct; 475(10):2503-2512.

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• Soreide E, Granan LP, Hjorthaug GA, Espehaug B, Dimmen S, Nordsletten L. The effect of limited perioperative nonsteroidal anti-inflammatory drugs on patients undergoing anterior cruciate ligament reconstruction. Am J Sports Med. 2016 Dec;44(12):3111-3118.

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• Ulstein S, Bredland K, Årøen A, Engebretsen L, Røtterud JH. No negative effect on patient-reported outcome of concomitant cartilage lesions 5-9 years after ACL reconstruction. Knee Surg Sports Traumatol Arthrosc. 2016 May 19;25(5):1482-1488.

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• Røtterud JH, Sivertsen EA, Forssblad M, Engebretsen L, Årøen A. Effect on patient-reported outcomes of debridement or microfracture of concomitant full-thickness cartilage lesions in anterior curciate ligamet-reconstructed knees: A nationwide cohort study from Norway and Sweden of 357 patients with 2-year follow-up. Am J Sports Med. 2016 Feb;44(2):337-44.

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• Moksnes H, Engebretsen L, Seil R. The ESSKA paediatric anterior cruciate ligament monitoring initiative. Knee Surg Sports Traumatol Arthrosc. 2016 Mar;24(3):680-7.

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• Owesen C, Sandven-Thrane S, Lind M, Forssblad M, Granan LP, Årøen A. Epidemiology of surgically treated posterior cruciate ligament injuries in Scandinavia. Knee Surg Sports Traumatol Arthrosc. 2015 Sep 19; 25(8):2384-2391.

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• Persson A, Kjellsen AB, Fjeldsgaard K, Engebretsen L, Espehaug B, Fevang JM. Registry data highlight increased revision rates for endobutton/biosure HA in ACL reconstruction with hamstring tendon autograft. A nationwide cohort study from the Norwegian Knee Ligament Registry, 2004-2013. Am J Sports Med. 2015 Sep;43(9):2182-8.

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• Magnussen RA, Trojani C, Granan LP, Neyret P, Colombet P, Engebretsen L, Wright RW, Kaeding CC, MARS Group, SFA Revision ACL Group. Patient demographics and surgical characteristics in ACL revision: a comparison of French, Norwegian and North American cohorts. Knee Surg Sports Traumatol Arthrosc. 2015 Aug;23(8):2339-48.

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• Owesen C, Sivertsen EA, Engebretsen L, Granan LP, Årøen A. Patients with isolated PCL injuries improve from surgery as much as patients with ACL injuries after 2 years. Ortop J Sports Med. 2015 Aug 19;3(8):2325967115599539.

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• Ingelsrud LH, Granan LP, Engebretsen L, Roos E. Proportion of patients reporting acceptable symptoms or treatment failure and their associated KOOS values at 6 to 24 months after anterior cruciate ligament reconstruction. Am J Sports Med. 2015 Aug;43(8):1902-7.

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• LaPrade CM, Dornan GJ, Granan LP, LaPrade RF, Engebretsen L. Outcomes after anterior cruciate ligament reconstruction using the Norwegian knee ligament registry of 4691 patients: How does meniscal repair or resection affect short-term outcomes? Am J Sports Med. 2015 Jul;43(7):1591-7.

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• Engebretsen L, Forssblad M, Lind M. Why registries analysing cruciate ligament surgery are important. Br J Sports Med. 2015 May;49(10):636-8

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• Granan LP, Baste V, Engebretsen L, Inacio MC. Associations between inadequate knee function detected by KOOS and prospective graft failure in an anterior cruciate ligament-reconstructed knee. Knee Surg Sports Traumatol Arthrosc. 2015 Apr;23(4):1135-40

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• Lynch AD, Logerstedt D, Grindem H, Eitzen I, Hicks GE, Axe MJ, Engebretsen L, Risberg MA, Snyder-Mackler L. Consensus criteria for defining ‘successful outcome’ after ACL injury and reconstruction: a Delaware-Oslo ACL cohort investigation. Br J Sports Med. 2015 Mar;49(5):335-42.

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• Grindem H, Granan LP, Risberg MA, Engebretsen L, Snyder-Mackler L, Eitzen I. How does a combined preoperative and postoperative rehabilitation programme influence the outcome of ACL reconstruction 2 years after surgery? A comparison between patients in the Deleware-Oslo ACL Cohort and the Norwegian National Knee Ligament Registry. Br J Sports Med. 2015 Mar;49(6):385-9.

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• Gifstad T, Foss OA, Engebretsen L, Lind M, Forssblad M, Albrektsen G, Drogset JO. Lower risk of revision with patellar tendon autografts compared with hamstring autografts: a registry study based on 45,998 primary ACL reconstructions in Scandinavia. Am J Sports Med. 2014 Oct;42(10):2319-28.

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• Persson A, Fjeldsgaard K, Gjertsen JE, Kjellsen AB, Engebretsen L, Hole RM, Fevang JM. Increased risk of revision with hamstring tendon grafts compared with patellar tendon grafts after anterior cruciate ligament reconstruction. A study of 12,643 patients from the Norwegian Cruciate Ligament Registry. 2004-2012. Am J Sports Med. 2014 Feb;42(2):285-91.

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• Engebretsen L. ACL surgery is not for all patients, nor for all surgeons. Knee Surg Sports Traumatol Arthrosc. 2014 Jan;22(1):1-2.

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• Wijdicks CA, Michalski MP, Rasmussen MT, Goldsmith MT, Kennedy NI, Lind M, Engebretsen L, LaPrade RF. Superficial medial collateral ligament anatomic augmented repair versus anatomic reconstruction: an in vitro biomechanical analysis. Am J Sports Med. 2013 Dec;41(12):2858-66.

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• Wijdicks CA, Kennedy NI, Goldsmith MT, Devitt BM, Michalski MP, Årøen A, Engebretsen L, LaPrade RF. Kinematic analysis of the posterior cruciate ligament, part 2 : A comparison of anatomic single- versus double-bundle reconstruction. Am J Sports Med. 2013 Dec;41(12):2839-48.

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• Kennedy NI, Wijdicks CA, Goldsmith MT, Michalski MP, Devitt BM, Årøen A, Engebretsen L, LaPrade RF. Kinematic analysis of the posterior cruciate ligament, part 1 : The individual and collective function of the anterolateral and posteromedial bundles. Am J Sports Med. 2013 Dec;41(12):2828-38.

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• Granan LP, Inacio MC, Maletis GB, Funahashi TT, Engebretsen L. Sport-spesific injury pattern recorded during anterior cruciate ligament reconstruction. Am J Sports Med. 2013 Dec;41(12):2814-8.

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• Ekeland, AE, Engebretsen L, Heir S. Sekundær ACL rekonstruksjon hos fotballspillere, håndballspillere og alpine skiløpere. Norsk idrettsmedisin 2013 (3):21.

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• Andersen CA, Clarsen B, Johansen TV, Engebretsen L. High prevalence of overuse injury among iron-distance triathletes. Br J Sports Med. 2013 Sep;47(13):857-61.

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• Moksnes H, Engebretsen L, Risberg MA. Prevalence and incidence of new meniscus and cartilage injuries after a nonoperative treatment algorithm for ACL tears in skeletally immature children : A prospective MRI study. Am J Sports Med. 2013 Aug;41(8):1771-9.

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• Goldsmith MT, Jansson KS, Smith SD, Engebretsen L, LaPrade RF, Wijdicks CA. Biomechanical comparison of anatomic single- and double-bundle anterior cruciate ligament reconstructions: an in vitro study. Am J Sports Med. 2013 Jul;41(7):1595-604.

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• Moksnes H, Engebretsen L, Eitzen I, Risberg MA. Functional outcomes following a non-operative treatment algorithm for anterior cruciate ligament injuries in skeletally immature children 12 years and younger : A prospective cohort with 2 years follow-up. Br J Sports Med. 2013 May;47(8):488-94.

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• Arøen A, Sivertsen EA, Owesen C, Engebretsen L, Granan LP. An isolated rupture of the posterior cruciate ligament results in reduced preoperative knee function in comparison with an anterior cruciate ligament injury. Knee Surg Sports Traumatol Arthrosc. 2013 May;21(5):1017-22.

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• Aga C, Rasmussen MT, Smith SD, Jansson KS, LaPrade RF, Engebretsen L, Wijdicks CA. Biomechanical comparison of interference screws and combination screw and sheath devices for soft tissue anterior cruciate ligament reconstruction on the tibial side. Am J Sports med. 2013 Apr;41(4):841-8.

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• Øiestad BE, Holm I, Engebretsen L, Aune AK, Gunderson R, Risberg MA. The prevalence of patellofemoral osteoarthritis 12 years after anterior cruciate ligament reconstruction. Knee Surg Sports Traumatol Arthrosc. 2013 Apr;21(4):942-9.

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• Røtterud JH, Sivertsen E, Forssblad M, Engebretsen L, Årøen A. Effect of meniscal and focal cartilage lesions on patient-reported outcome after anterior cruciate ligament reconstruction: A aationwide cohort study from Norway and Sweden of 8476 patients with 2-Year follow-up. Am J Sports Med. 2013 Mar;41(3):535-43.

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• Getgood A, Collins B, Slynarski K, Kurowska E, Parker D, Engebretsen L, MacDonald PB, Litchfield R. Short-term safety and efficacy of a novel high tibial osteotomy system: a case controlled study. Knee Surg Sports Traumatol Arthrosc. 2013 Jan;21(1):260-9.

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• Granan LP, Inacio MC, Maletis GB, Funahashi TT, Engebretsen L. Intraoperative findings and procedures in culturally and geographically different patient and surgeon populations: an anterior cruciate ligament reconstruction registry comparison between Norway and the USA. Acta Orthop 2012 Dec;83(6):577-82.

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• Ytterstad K, Granan LP, Ytterstad B, Steindal K, Fjeldsgaard KA, Furnes O, Engebretsen L Registration rate in the Norwegian Cruciate Ligament Register. Acta Orthopaedica 2012; 83 (2): 174–178.

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• Røtterud JH, Risberg MA, Engebretsen L, Arøen A. Patients with focal full-thickness cartilage lesions benefit less from ACL reconstruction at 2-5 years follow-up. Knee Surg Sports Traumatol Arthrosc 2012 Aug;20(8):1533-9.

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• Røtterud JH, Sivertsen EA, Forssblad M, Engebretsen L, Årøen A. Effect of gender and sports on the risk of full-thickness articular cartilage lesions in anterior cruciate ligament -injured knees: a nationwide cohort study from Sweden and Norway of 15 783 patients. Am J Sports Med 2011 Jul;39(7):1387-94.

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• Maletis GB, Granan LP, Inacio MCS, Funahashi TT, Engebretsen L. Comparison of Community-Based ACL Reconstruction Registries in the U.S. and Norway. J Bone Joint Surg Am. 2011;93 Suppl 3(E):31-6.

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• Ytterstad K, Granan L, Engebretsen L. The Norwegian Cruciate Ligament Registry has a high degree of completeness. Tidsskrift for Den norske legeforening, 2011; 131:248-50.

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• Hjermundrud V, Bjune TK, Risberg MA, Engebretsen L, Arøen A. Full-thickness cartilage lesion do not affect knee function in patients with ACL injury. Knee Surg Sports Traumatol Arthrosc 2010 Mar;18(3):298-303.

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• Heir S, Nerhus TK, Røtterud JH, Løken S, Ekeland A, Engebretsen L, Årøen A. Focal cartilage defects in the knee impair quality of life as much as severe osteoarthritis: a comparison of knee injury and osteoarthritis outcome score in 4 patient categories scheduled for knee surgery. Am J Sports Med 2010 Feb; 38(2);2

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• Magnussen RA, Granan LP, Dunn WR, Amendola A, Andrish JT, Brophy R, Carey JL,Flanigan D, Huston LJ, Jones M, Kaeding CC, McCarty EC, Marx RG, Matava MJ, Parker RD, Vidal A, Wolcott M, Wolf BR, Wright RW, Spindler KP, Engebretsen L. Cross-cultural comparison of patients undergoing ACL reconstruction in the United States and Norway. Knee Surg Sports Traumatol Arthrosc. 2010 Jan;18(1):98-105.

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• Granan LP, Forssblad M, Lind M, Engebretsen L. The Scandinavian ACL registries 2004-2007: baseline epidemiology. Acta Orthop, 2009 Oct;80:5,563-7.
  
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• Granan LP, Bahr R, Lie SA, Engebretsen L. Timing of anterior cruciate ligament reconstructive surgery and risk of cartilage lesions and meniscal tears: a cohort study based on the Norwegian National Knee Ligament Registry. Am J Sports Med 2009 May;37(5):955-61.
  

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• Why knee ligament registries are important. Knee Surg Sports Traumatol Arthrosc. 2009 Feb;17(2):115-6.

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• Årøen A, Hjermundrud V, Kvist T, Engebretsen L, Risberg MA. Preoperatively no significant difference in functional scoring (KOOS) in anterior cruciate ligament-injured knees with and without a full thickness cartilage lesion. BJSM The Journal of Sport and Excercise Medicine, June 2008, Vol. 42, No.6.

• Moksnes H, Engebretsen L, Risberg MA. Performance-based functional outcome for children 12 years or younger following anterior cruciate ligament injury: a two to nine-year follow-up study. Knee Surg Sports Traumatol Arthrosc; 16(3):214-23.

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• Granan LP, Bahr R, Steindal K, Furnes O, Engebretsen L. Development of a national cruciate ligament surgery registry – the Norwegian National Knee Ligament registry. Am J Sports Med 2008;36:308-15.

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• Granan LP, Engebretsen L, Bahr R. Kirurgi ved fremre korsbåndskader i Norge - sett fra et idrettsmedisinsk perspektiv. Norsk Idrettsmedisin 2004;4:3-4.

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• R. Surgery for anterior cruciate ligament injuries in Norway. Tidsskr Nor Lægeforen 2004;124:928-30.

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