Maintenance of hamstring strength following knee surgery

Area of Science:

• Orthopedic Surgery
• Sports Medicine
• Rehabilitation Science

Background:

• Knee surgeries commonly impact quadriceps and hamstring muscle strength.
• Understanding differential muscle group recovery is crucial for effective rehabilitation protocols.

Purpose of the Study:

• To compare the strength deficits of quadriceps and hamstring muscle groups after knee surgery.
• To evaluate the influence of different surgical procedures on muscle recovery.

Main Methods:

• Two groups of post-surgical patients (arthrotomy/meniscectomy and ACL reconstruction) were assessed.
• Muscle strength was measured using Cybex II testing at 60 degrees/s.
• Peak torque of quadriceps and hamstrings was analyzed at multiple joint angles.

Main Results:

• Hamstring muscle groups exhibited significantly less strength deficit compared to quadriceps (P=0.041).
• Significant differences in strength deficits were observed between the two surgical groups (P<0.001).
• No significant differences in strength deficits were found across various joint angles.

Conclusions:

• Post-surgical knee rehabilitation may not always require specific hamstring strengthening exercises.
• Quadriceps muscles appear more susceptible to strength loss following knee surgery than hamstrings.