217 Isokinetic deficits at 6 months after ACL reconstruction influence the rate of reinjuries and activity level. (3rd March 2020)

• Record Type: Journal Article
• Authors: Andrade, Renato; Dias, José; Cardoso, Cátia; Valente, Cristina; Pereira, Rogério; Rebelo-Marques, Alexandre; Proença, Tiago; Lamas, Pedro; Cordeiro, Nuno; Silva, Alcindo; Espregueira-Mendes, João
• Is Part Of: British journal of sports medicine. Volume 54(2020)Supplement 1
• Page Start: A90
• Page End: A91
• Publication Date: 2020-03-03
• Subjects: Sports medicine -- Periodicals; 617.1027
• DOI: 10.1136/bjsports-2020-IOCAbstracts.217
• Languages: English
• ISSNs: 0306-3674

Abstract

Abstract : Background: Recent evidence suggests that athletes may not be prepared to return to sport at 6 months following an anterior cruciate ligament (ACL) reconstruction. Objective: Identify knee isokinetic neuromuscular deficits at 6 months after ACL reconstruction and assess if deficits impact on the rate of new knee injuries and level of activity. Design: Retrospective study. Setting: Recreational and competitive athletes. Patients (or Participants): Fifty-eight patients (27.1±7.1 years old; 79% male) that underwent ACL reconstruction (62% hamstrings and 38% bone-patellar-tendon-bone grafts) and that performed the knee isokinetic testing at 6 months. Interventions (or assessment of risk factors): Bilateral knee isokinetic assessment at 6 months, 6 and 8 Con/Con repetitions, at 60°/s and 180°/s, respectively. Main outcome measurements: Peak torque of knee extensors and flexors at 60°/s and 180°/s and Con/Con unilateral ratio. Prevalence of bilateral (>10%) and unilateral ratio (<0.47 and >0.80) abnormalities. The level of activity (Tegner) and number of new knee injuries (ACL or other knee injury). Results: Fifty-two participants (90%) had bilateral deficits at 60°/s, 74% and 59% for knee extensors and flexors, respectively. Unilateral abnormalities were present on 16% of participants at 60°/s and 180°/s. Thirty-seven participants had 2 or more years follow-up (28 hamstrings and 9 bone-patellar-tendon-bone graft). From these, there were 4 new ACL injuries (75% contralateral) and 8 other knee injuries (50% contralateral). Rate of new knee injuries was more frequent on hamstrings graft (25% vs 10%). Those with bilateral deficits at 60°/s (n=31) had higher rate of new knee injuries (23% vs 17%) and higher rate of Tegner level decrease (45% vs 17%). Conclusions: We found an unacceptably high rate of participants (90%) display knee isokinetic bilateral deficits at 60°/s at 6 months after ACL reconstruction. Bilateral deficits seem to influence the rate of new knee injuries and Tegner activity level.