“Ultrasound Echo Intensity of the Rectus Femoris Correlates Muscle Strength in the Post-Operative Rehabilitation of Anterior Cruciate Ligament Reconstruction: Original Research”. Research in Strength and Performance 6, no. 1 (January 2, 2026). Accessed April 23, 2026. https://researchdirects.com/index.php/strengthandperformance/article/view/165.