PT  - JOURNAL ARTICLE
AU  - Andrade, Renato
AU  - Dias, José
AU  - Cardoso, Cátia
AU  - Valente, Cristina
AU  - Pereira, Rogério
AU  - Rebelo-Marques, Alexandre
AU  - Proença, Tiago
AU  - Lamas, Pedro
AU  - Cordeiro, Nuno
AU  - Silva, Alcindo
AU  - Espregueira-Mendes, João
TI  - 191 Isokinetic deficits at 6 months after ACL reconstruction influence the rate of reinjuries and activity level
AID  - 10.1136/bjsports-2021-IOC.176
DP  - 2021 Nov 01
TA  - British Journal of Sports Medicine
PG  - A75--A75
VI  - 55
IP  - Suppl 1
4099  - http://bjsm.bmj.com/content/55/Suppl_1/A75.1.short
4100  - http://bjsm.bmj.com/content/55/Suppl_1/A75.1.full
SO  - Br J Sports Med2021 Nov 01; 55
AB  - 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.