Does augmentation with a reinforced fascia patch improve rotator cuff repair outcomes?

Area of Science:

• Orthopedic surgery
• Biomaterials science
• Tissue engineering

Background:

• Scaffold devices are utilized to enhance rotator cuff repairs in human patients.
• The biomechanical strength of a novel poly-L-lactic acid-reinforced fascia patch is documented.
• The efficacy of these patches in improving rotator cuff repair strength and healing remains uncertain.

Purpose of the Study:

• To evaluate if reinforced fascia patches improve biomechanical properties at Time 0 and after 12 weeks of healing in canine rotator cuff repairs.
• To assess tendon retraction, cross-sectional area, and biomechanical properties post-augmentation.
• To determine if repairs reach normal biomechanical values by 12 weeks and if the patch elicits a biocompatible host response.

Main Methods:

• Canine infraspinatus tendons underwent acute repair, with one shoulder augmented and the contralateral shoulder serving as the control.
• Biomechanical properties (ultimate load, stiffness), tendon retraction, cross-sectional area, and host tissue response were evaluated at 12 weeks post-surgery.

Main Results:

• Augmented repairs showed a 46% greater ultimate load at Time 0 compared to nonaugmented repairs; stiffness was similar between groups.
• After 12 weeks, augmented repairs had 15% less ultimate load than nonaugmented repairs, with no difference in stiffness.
• The fascia patch exhibited a biocompatible host tissue response at the tendon repair site.

Conclusions:

• Reinforced fascia patches enhance the immediate ultimate load of rotator cuff repairs.
• Augmentation with reinforced fascia patches did not improve biomechanical properties after 12 weeks of healing.
• Nonaugmented repairs showed improved ultimate load over 12 weeks, surpassing augmented repairs.