4.5 Article

Lower Extremity Compensatory Neuromuscular and Biomechanical Adaptations 2 to 11 Years After Anterior Cruciate Ligament Reconstruction

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Publisher

W B SAUNDERS CO-ELSEVIER INC
DOI: 10.1016/j.arthro.2010.01.003

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Funding

  1. Norton Healthcare, Louisville, KY

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Purpose: To determine whether compensatory neuromuscular and biomechanical adaptations exist after successful anterior cruciate ligament reconstruction and rehabilitation. Methods: Seventy subjects, 5.3 +/- 3 years after surgery, participated in this study. Sagittal-plane lower extremity kinematic, gluteus maximus, vastus medialis, medial hamstring, and gastrocnemius electromyography (EMG) and vertical ground reaction force data were collected during single-leg countermovement jump (CMJ) performance. Results: Women had lower propulsive and landing forces, lower CMJ heights, less hip and knee flexion, and greater angular hip, knee, and ankle velocities than men (P <= .014). The involved lower extremity of men and women had decreased landing forces (P = .008). During propulsion, men and women had increased involved-lower extremity gluteus maximus (P < .0001) and decreased vastus medialis (P = .013) EMG amplitudes, whereas women had bilaterally increased gastrocnemius EMG amplitudes compared with men (P = .003). During propulsion, men had longer gluteus maximus and vastus medialis EMG durations than women (P < .0001). During landing, both men and women had increased gluteus maximus EMG amplitudes at the involved lower extremity (P < .0001). Women had increased vastus medialis (P = .01) and gastrocnemius (P < .0001) EMG amplitudes compared with men. During landing, men had longer gluteus maximus (P = .004), vastus medialis (P = .012), and gastrocnemius (P = .007) EMG durations than women and the involved-lower extremity vastus medialis EMG durations of both men and women were shorter than at the noninvolved lower extremity (P = .011). Conclusions: Decreased involved-lower extremity landing forces, decreased vastus medialis activation, and increased gluteus maximus and gastrocnemius activation suggest a protective mechanism to minimize knee loads that increase anterior translatory knee forces during single-leg jumping. Women showed more balanced gluteus maximus, vastus medialis, and gastrocnemius contributions to dynamic knee stability than men during CMJ landings but used shorter activation durations. Level of Evidence: Level IV, therapeutic case series.

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