Oslo Sports Trauma Research Center

Details about researcher: May Arna Risberg

CV

May Arna Risberg, PT, is professor at the Norwegian School of Sport Sciences, Department of Sports Medicine and the chair of the Norwegian research center for Active Rehabilitation (NAR).

CV 2013 (last 5 years) 

Projects

• Better and safer return to sport after anterior cruciate ligament reconstruction (BEAST)

  Project manager: Hege Grindem

• Single-bundle versus double-bundle ACL reconstruction; a prospective, randomized controlled study of 120 patients

  Project manager: Cathrine Aga

Publications

• 2025

  • Clinical, Functional, Sports Participation, and Osteoarthritis Outcomes After ACL Injury: Ten-Year Follow-up Study of the Delaware-Oslo ACL Cohort Treatment Algorithm

    Urhausen, Anouk; Pedersen, Marie; Grindem, Hege; Ito, Naoaki; Arhos, Elanna; Gunderson, Ragnhild; Aune, Arne Kristian; Engebretsen, Lars; Axe, Michael; Grävare Silbernagel, Karin; Holm, Inger; Snyder-Mackler. Lynn; Riseberg, May Arna

    The Journal of Bone and Joint Surgery. American volume 2025 Apr 16;107(8):840-848

  • Arthroscopic partial meniscectomy versus exercise therapy for degenerative meniscal tears: 10-year follow-up of the OMEX randomised controlled trial

    Berg, Bjørnar; Roos, Ewa; Englund, Martin; Kise, Nina Jullum; Engebretsen, Lars; Nørstad Eftang, Cathrine; Risberg, May Arna

    British Journal of Sports Medicine 2025 Jan 2;59(2):91-98.

  • No difference in osteoarthritis, but less graft failures after 5 years, comparing anatomic double-bundle to anatomic single-bundle ACL reconstruction

    Aga, Cathrine; Trøan, Ingrid; Heir, Stig; Risberg, May Arna; Rana, Tariq; Johansen, Steinar; Wang Fagerland, Morten; Engebretsen, Lars

    Knee Surgery, Sports Traumatology, Arthroscopy 2025 Aug;33(8):2781-2792.

• 2022

  • Association of Quadriceps Strength Symmetry and Surgical Status With Clinical Osteoarthritis Five Years After Anterior Cruciate Ligament Rupture

    Arhos, Elanna K; Thoma, Louise M; Grindem, Hege; Logerstedt, David; Risberg, May Arna; Snyder-Mackler, Lynn

    Arthritis Care & Research 2022:74(3):386-391

• 2021

  • Low Rates of Radiographic Knee Osteoarthritis 5 Years After ACL Reconstruction or Rehabilitation Alone: The Delaware-Oslo ACL Cohort Study

    Pedersen, Marie; Grindem, Hege; Berg, Bjørnar; Gunderson, Ragnhild; Engebretsen, Lars; Axe, Michael J; Snyder-Mackler, Lynn; Risberg, May Arna

    Orthopaedic Journal of Sports Medicine 2021: 9(8)

  • Assessing implementation, limited efficacy, and acceptability of the BEAST tool: A rehabilitation and return-to-sport decision tool for nonprofessional athletes with anterior cruciate ligament reconstruction

    Moksnes, Håvard; Ardern, Clare L; Kvist, Joanna; Engebretsen, Lars; Risberg, May Arna; Myklebust, Grethe; Grindem, Hege

    Physical Therapy in Sports 2021:52:147-154

  • Clinical, Functional, and Physical Activity Outcomes 5 Years Following the Treatment Algorithm of the Delaware-Oslo ACL Cohort Study

    Pedersen, Marie; Grindem, Hege; Johnson, Jessica L; Engebretsen, Lars; Axe, Michael J; Snyder-Mackler, Lynn; Risberg, May Arna

    The Journal of Bone and Joint Surgery 2021:103(16):1473-1481

• 2020

  • Does Surgery Reduce Knee Osteoarthritis, Meniscal Injury and Subsequent Complications Compared With Non-Surgery After ACL Rupture With at Least 10 Years Follow-Up? A Systematic Review and Meta-Analysis

    Lien-Iversen, Teodor; Morgan, Daniel Barklin; Jensen, Carsten; Risberg, May Arna; Engebretsen, Lars; Viberg, Bjarke

    British Journal of Sports Medicine 2020:54(10):592-598

  • Activity and functional readiness, not age, are the critical factors for second anterior cruciate ligament injury — the Delaware-Oslo ACL cohort study

    Grindem, Hege; Engebretsen, Lars; Axe, Michael; Snyder-Mackler, Lynn; Risberg, May Arna

    British Journal of Sports Medicine 2020:Feb 11th (Epub ahead of print)

• 2019

  • Knee pathology in young adults after paediatric ACL injury - a prospective case series of 47 patients with a mean 9.5-yr follow-up

    Ekås, Guri Ranum; Laane, Marit Mjelde; Larmo, Arne; Moksnes, Håvard; Grindem, Hege; Risberg, May Arna; Engebretsen, Lars

    American Journal of Sports Medicine 2019 Jun;47(7):1557-1566

• 2018

  • Knee stability and movement coordination impairments: knee ligament sprain revision 2017

    Logerstedt, DS; Scalzitti, D; Risberg, May Arna; Engebretsen, Lars; Webster, KE; Feller, J; Snyder-Mackler, L; Axe, MJ; McDonough, CM

    Journal of Orthopaedic and Sports Physical Therapy 2017:47(11):A1-A47

  • The 6-m timed hop test is a prognostic factor for outcomes in patients with meniscal tears treated with exercise therapy or arthroscopic partial meniscectomy: a secondary, exploratory analysis of the Odense-Oslo meniscectomy versus exercise (OMEX) trial

    Kise, Nina; Roos, Eva Maria; Stensrud, Silje; Engebretsen, Lars; Risberg, May Arna

    Knee Surgery, Sports Traumatology and Arthroscopy 2018: published online Nov 16

  • Normative quadriceps and hamstring muscle strength values for female, healthy, elite handball and football players

    Risberg, May Arna; Steffen, Kathrin; Nilstad, Agnethe; Myklebust, Grethe; Kristianslund, Eirik; Moltubakk, Marie; Krosshaug, Tron

    Journal of Strength and Conditioning Research 2018:32(8):2314-2323

  • 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 years’ follow-up

    Aga, Cathrine; Risberg, May Arna; Fagerland, Morten; Johansen, Steinar; Trøan, I; Heir, Stig; Engebretsen, Lars.

    American Journal of Sport Medicine 2018: Published online July 18

• 2016

  • Changes in knee osteoarthritis, symptoms, and function after anterior cruciate ligament reconstruction: A 20-year prospective follow-up study

    Risberg, May Arna; Oiestad, Britt Elin; Gunderson, Raghnhild; Aune, Arne Kristian; Engebretsen, Lars; Culvenor, Adam; Holm, Inger

    American Journal of Sports Medicine 2016:44(5):1215-1224

• 2015

  • 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 Delaware-Oslo ACL Cohort and the Norwegian National Knee Ligament Registry

    Grindem, Hege; Granan, Lars-Petter; Risberg, May-Arna; Engebretsen, Lars; Snyder-Mackler, Lynn; Eitzen, Ingrid

    British Journal of Sports Medicine 2015:49(6):385-389

• 2014

  • Defining the presence of radiographic knee osteoarthritis: a comparison between the Kellgren and Lawrence system and OARSI atlas criteria

    Culvenor, Adam G; Engen, Cathrine N; Øiestad, Brit Elin; Engebretsen, Lars; Arna Risberg, May Arna

    Knee Surgery Sports Traumatology Arthroscopy 2015:23(12):3532-3539

  • Self-reported knee function can identify athletes who fail return-to-activity criteria up to 1 year after ACL reconstruction: a Delaware-Oslo ACL cohort study

    Logerstedt, David; Di Stasi, Stephanie; Grindem, Hege; Lynch, Andrew: Eitzen, Ingrid; Engebretsen, Lars; Risberg, MAy Arna; Axe, Michael J; Snyder-Mackler, Lynn

    Journal of Orthopedic and Sports Physical Therapy 2014:44(12):914-923

• 2013

  • 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

    Moksnes, Håvard; Engebretsen, Lars; Eitzen, Ingrid; Risberg, May Arna

    British Journal of Sports Medicine 2013:47(8):488-494

• 2012

  • Ultrasound-guided sclerosis of neovessels in patellar tendinopathy - a prospective study of 101 patients

    Hoksrud, Aasne; Torgalsen, Thomas; Harstad, Herlof; Haugen, Simen; Andersen, Thor Einar; Risberg, May Arna; Bahr, Roald

    American Journal of Sports Medicine 2012:40(3):542-547

  • The current evidence for treatment of ACL injuries in children is low: a systematic review

    Moksnes, Håvard; Engebretsen, Lars; Risberg, May Arna

    Journal of Bone and Joint Surgery. American volume 2012:94(12):1112-1119

  • Management of anterior cruciate ligament injuries in skeletally immature individuals

    Moksnes, Håvard; Engebretsen, Lars; Risberg, May Arna

    Journal of Orthopaedic & Sports Physical Therapy 2012:42(3):172-183

  • Patients with focal full-thickness cartilage lesions benefit less from ACL reconstruction at 2-5 years follow-up

    Røtterud, Jan Harald; Risberg, May Arna; Engebretsen, Lars, Arøen Asbjørn

    Knee Surgery, Sports Traumatology, Arthroscopy 2012:20(8):1533-1539

• 2011

  • Muscle strength and hop performance criteria prior to return to sports after ACL reconstruction

    Thomeé, R: Kaplan, Y; Kvist, J; Myklebust, Grethe; Risberg, May Arna; Theisen, D; Tsepis, E; Werner, S; Wondrasch, B; Witvrouw, E

    Knee Surgery, Sports Traumatology, Arthroscopy 2011:19(11):1798-1805

• 2009

  • Preoperative quadriceps strength is a significant predictor of knee function two years after anterior cruciate ligament reconstruction

    Eitzen, Ingrid; Holm, Inger; Risberg, May Arna

    British Journal of Sports Medicine 2009:43(5):371-376

  • Full-thickness cartilage lesion do not affect knee function in patients with ACL injury

    Hjermundrud, Vegar; Bjune, Tonje Kvist; Risberg, May Arna; Engebretsen, Lars; Aarøen, Asbjørn

    Knee Surgery, Sports Traumatology, Athroscopy 2010:18(3):298-303

• 2008

  • Performance-based functional outcome for children 12 years or younger following anterior cruciate ligament injury: a two to nine-year follow-up study

    Moksnes, Håvard; Engebretsen, Lars; Risberg May Arna

    Knee Surgery, Sports Traumatology, Arthroscopy 2008:16(3):214-223

• 2007

  • Neuromuscular Training Versus Strength Training During First 6 Months After Anterior Cruciate Ligament Reconstruction: A Randomized Clinical Trial

    Risberg, May Arna; Holm, Inger; Myklebust, Grethe; Engebretsen, Lars

    Physical Therapy 2007:87(6):737-750