The Effect of Progressive Resistance Exercise on Knee Muscle Strength and Function in Participants with Persistent...

Area of Science:

• Orthopedics
• Sports Medicine
• Rehabilitation Science

Background:

• Anterior cruciate ligament (ACL) reconstruction often results in persistent hamstring strength deficits.
• Evaluating rehabilitation strategies is crucial for optimizing recovery and function post-ACL surgery.

Purpose of the Study:

• To compare the effectiveness of supervised progressive resistance exercise versus low-intensity home-based exercises.
• To assess the impact on knee-muscle strength and joint function in patients with ACL reconstruction and hamstring weakness 12-24 months post-surgery.

Main Methods:

• A randomized controlled superiority trial involved 51 participants with ACL reconstruction and hamstring asymmetry.
• Participants were randomized to 12 weeks of supervised progressive strength training (SNG) or home-based exercises (CON).
• Primary outcome was the change in maximal isometric knee flexor muscle strength at 12 weeks, with blinded assessment.

Main Results:

• The SNG group demonstrated a significant improvement in knee flexor muscle strength compared to the CON group (0.18 N·m/kg, P = .002).
• Participants in the SNG group reported superior outcomes for knee pain (4.6, P = .031) and daily living function (4.7, P = .010).
• The study achieved an 88% follow-up rate at 12 weeks.

Conclusions:

• Supervised progressive strength training is superior to home-based exercises for enhancing knee flexor strength post-ACL reconstruction.
• This exercise approach also improves pain and functional outcomes in patients with persistent hamstring deficits.
• Targeted, supervised rehabilitation is recommended for individuals with residual strength impairments after ACL surgery.