بررسي مقايسه اي نسبت فعاليت عضله پهن داخلي به پهن خارجي در بيماران مبتلا به جابجايي خارجي استخوان كشكك و افراد سالم

A COMPARATIVE STUDY OF VASTUS MEDIALIS OBLIQUES AND VASTUS LATERALIS RATIO IN PATIENTS WITH PATELLAR LATERALIZATION AND HEALTHY SUBJECTS

The patellar stability is maintained by ligaments. Muscles and joint capsule. Due to vastus medialis atrophy patella is moving outward and finally causes lateral hyperpressure syndrome. Which is painful!. This is a common syndrome that too many patients suffered from it. The perpose of this study is to determine the level of activity of medial and lateral muscles of the patellofemoral joint that are critical for patellar dynamic stability. Twenty persons (10 healthy and I0 patients with patellar lateralization) participated in this study IEMG and IAV parameters were obtained by telemetric EMG instrument from vastus medialis obliques (VMO) and vastus lateralis (VL) during maximal voluntary isometric contraction in three different angels of knee flexion (I5,30 and 45 degrees). While subjects sitted on Biodex machine. In conclusion thc findings of this study demonstrate that during maximal voluntary isometric contraction in patients with patellar lateralization minimal VMO activity exists as compared with the highly ctive VL in selected degrees of range of motion. In addition in patients group VMO/VL ratio is less than 1. This is due to deficicncy of nuero-muscular control system that decrease functional joint stability.