Load Management After Gluteal Tendon Repair: A Controlled Laboratory Study.

Area of Science:

• Orthopedics
• Biomechanics
• Sports Medicine

Background:

• Gluteal tendon lesions often necessitate surgical intervention when conservative methods fail.
• Postoperative rehabilitation and hip joint loading significantly impact the success of gluteal tendon repair.
• Excessive loading during ambulation can lead to re-injury or overload of the repaired tendon.

Purpose of the Study:

• To quantify the biomechanical loading on gluteal tendons and the hip joint under different weight-bearing conditions post-surgery.
• To provide evidence-based recommendations for optimal postoperative loading following gluteal tendon repair.

Main Methods:

• Six subjects underwent instrumented 3D gait analysis using optoelectronic motion capture.
• Three loading conditions were tested: full weight-bearing, partial weight-bearing, and full unloading with crutches.
• In silico inverse dynamics multi-body simulation was employed to calculate tendon and hip joint forces.

Main Results:

• Peak gluteal tendon forces during full weight-bearing were 12.0 N/kg BW (gluteus medius) and 5.0 N/kg BW (gluteus minimus).
• Partial weight-bearing reduced these loads by approximately 68%, while full unloading decreased them by about 88%.
• Maximum hip joint load during full weight-bearing was 39.8 N/kg BW.

Conclusions:

• Partial weight-bearing significantly reduces biomechanical stress on repaired gluteal tendons and the hip joint.
• Full unloading is advised when tendon or bone integrity is compromised, or suture stability is reduced.
• For stable repairs, partial weight-bearing is recommended to balance mechanical loading and prevent muscle atrophy.