Correlation between Hamstring Muscle Activity in Squatting and Quadriceps Strength after Anterior Cruciate Ligament Reconstruction

Abstract

[Purpose] To examine the correlation between hamstring activity during squatting before anterior cruciate ligament (ACL) surgery and quadriceps strength at 6 months after surgery. [Subjects] The subjects were 12 persons who received anatomical double bundle ACL surgery. [Method] Activity of the hamstring muscle in squatting before surgery and quadriceps muscle strength relative to body weight at 6 months after surgery were measured, and the correlation was determined. [Results] We found a negative correlation between the hamstring muscle activity of squatting before surgery and the quadriceps muscle strength relative to body weight at 6 months after surgery. [Conclusion] The results suggest that for patients receiving ACL reconstruction surgery, those with high hamstring muscle activity in squatting will have low quadriceps muscle strength, in spite of performing CKC exercise, for which risk management is good, in the acute post-surgery period.