Purpose of this study was to investigate the effects of anterior cruciate ligament (ACL) repair on the γ loop of the bilateral quadriceps femoris (QF). Maximal voluntary contraction (MVC) of knee extension and integrated electromyogram (I-EMG) of vastus medialis (VM), vastus lateralis (VL), and rectus femoris (RF) were examined in uninjured and injured limbs of 18 patients and 10 normal subjects, before and after 20-min vibration applied to the QF. Mean percentage changes were calculated as: (pre-vibration value-post-vibration value)/pre-vibration value × 100. Patients were divided into two groups: short-term-group (tested ≤12 months after ACL repair, n=8), long-term-group (tested ≥18 months after ACL repair, n=10). Mean percentage changes of the four groups were compared with those of controls. Results indicated that changes of MVC and I-EMG on the uninjured and injured sides in short-term-group in response to vibration were significantly different from those of controls. There were no significant differences between uninjured sides in long-term and control groups. MVC and I-EMG of VM and RF of injured side in patients in the long-term-group in response to vibration were not different from those of controls. From these results, we concluded that this abnormality of the γ loop in both injured and uninjured sides did not recover despite ACL reconstruction. However, the abnormality in uninjured side might recover ≥18 months after repair.
|ジャーナル||Scandinavian Journal of Medicine and Science in Sports|
|出版ステータス||Published - 2007 8|
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