Oral Communication

Reproductibility evaluation of hamstring latency measurement on isokinetic device


a CHU Montpellier-Nîmes

Nature of knee stability is dual : the passive system which is composed of ligament and capsule and the dynamic system composed of neuromuscular elements. Passive and active system are altered after Anterior Cruciate Ligament (ACL) lesion but passive laxity alone is insufficient for determination of functional status (Eastlack, Axe et al. 1999). Neuromuscular evaluations found a significant longer hamstring latency after ACL lesion and reconstruction (Wojtys and Huston 1994, Bonfim, Jansen Paccola et al. 2003) and this latency could be correlated to functional status (Beard, Dodd et al. 1994). For now there is no simple method to assess hamstring latency in clinical practice. The purpose of this study was to evaluate reproducibility hamstring latency measurement evaluated by force production after short and fast perturbation of movement using an isokinetic device (CON-TREX). We evaluated both knees of 10 healthy subjects (5 men and 5 women) 3 times a week apart, before and after an isokinetic test. We evaluated intra-subjects reproducibility of latency, peak torque and peak torque slope of hamstring and reproducibility of these values before and after isokinetic evaluation.

Keywords : Anterior Cruciate ligament injury ; hamstring latency ; stability ; reproductibility ; isokinetic