Rotator cuff tendon repair morphology comparing 2 single-anchor repair techniques

Area of Science:

• Orthopedic Surgery
• Biomechanical Engineering
• Sports Medicine

Background:

• Rotator cuff tears are common injuries, particularly in the supraspinatus tendon.
• Current single-anchor repair techniques vary, potentially impacting tendon healing and long-term outcomes.
• Understanding the biomechanical effects of different anchor placements is crucial for optimizing repair strategies.

Purpose of the Study:

• To compare the effects of two single-anchor rotator cuff repair techniques on tendon morphology.
• To evaluate tendon morphology in relation to the native footprint after repair.
• To determine the optimal single-anchor technique for small rotator cuff tears.

Main Methods:

• Dissection of six matched pairs of human shoulders with standardized 10-mm supraspinatus tendon tears.
• Performance of two single-anchor repairs: simple repair (anchor on footprint) and inverted-mattress repair (anchor 1 cm distal-lateral).
• Measurement of tendon area and radius of curvature using a digitizer on frozen cross-sections.

Main Results:

• The inverted-mattress repair showed significantly less gap formation (0.68 mm vs. 3.67 mm) compared to the simple repair.
• The inverted-mattress repair resulted in greater tendon area (58.65 mm² vs. 38.28 mm²) and a larger radius of curvature (32.51 mm vs. 8.47 mm).
• The simple repair led to significant gap formation, reduced tendon area, and smaller curvature radius compared to intact tendons.

Conclusions:

• For small (≤10 mm) rotator cuff tears requiring single-anchor repair, the inverted-mattress technique with distal-lateral anchor placement better maintains native tendon morphology.
• This technique preserves footprint dimensions more effectively than simple footprint repair.
• The inverted-mattress repair may offer an improved healing environment, potentially preventing early tear progression.