Quadriceps Function and Knee Joint Ultrasonography after ACL Reconstruction.

Area of Science:

• Orthopedics
• Biomedical Engineering
• Radiology

Background:

• Anterior cruciate ligament reconstruction (ACLR) increases osteoarthritis risk due to quadriceps dysfunction.
• Current imaging methods (MRI, radiography) for articular cartilage are costly and not portable.
• Ultrasound offers a potential cost-effective and portable alternative for femoral cartilage assessment.

Purpose of the Study:

• Compare femoral cartilage ultrasonography between injured and uninjured limbs in unilateral ACLR patients.
• Investigate the association between quadriceps function and ultrasonographic femoral cartilage measures.

Main Methods:

• Assessed bilateral femoral cartilage thickness and quadriceps function in 44 unilateral ACLR patients.
• Measured quadriceps function via peak isometric strength and rate of torque development (RTD100, RTD200).

Main Results:

• Injured limbs exhibited smaller medial femoral condyle cartilage thickness (P < 0.001) and cross-sectional area (P = 0.007) compared to uninjured limbs.
• Quadriceps peak isometric strength correlated with medial femoral condyle cartilage thickness (r = 0.35, P = 0.02) and cross-sectional area (r = 0.28, P = 0.04).
• No significant association found between RTD100/RTD200 and femoral cartilage measures.

Conclusions:

• ACLR patients present with reduced cartilage thickness in the injured limb.
• Quadriceps function is associated with femoral cartilage health post-ACLR.
• Ultrasonography shows promise for monitoring cartilage health and osteoarthritis progression after ACLR.