Capsular plication in the non-deformity hip: impact on post-operative joint stability

Area of Science:

• Orthopedic Surgery
• Biomechanical Research
• Hip Arthroscopy

Background:

• Hip arthroscopy often involves capsular dissection, potentially leading to joint instability.
• Capsular plication techniques aim to restore stability after arthroscopic procedures.
• Understanding the biomechanical effects of different plication methods is crucial for optimizing surgical outcomes.

Purpose of the Study:

• To evaluate the impact of various capsular plication techniques on hip joint range of motion, specifically external rotation.
• To test the hypothesis that capsular plication can reduce hip external rotation and prevent instability post-arthroscopy.

Main Methods:

• Fresh frozen human cadaveric hips (n=12) were used to simulate arthroscopic capsulotomies and three distinct capsular plication techniques.
• Hip external rotation was measured at 0°, 15°, and 30° of flexion after capsulotomy and each plication technique.
• Statistical analysis, including ANOVA and t-tests, was employed to determine significant changes in external rotation.

Main Results:

• Capsular plication techniques generally resulted in non-significant changes in hip external rotation compared to unrepaired capsulotomies.
• A significant interaction between plication technique and flexion angle was observed (P=0.04).
• The two-triangle technique showed a statistically significant, albeit small, increase in external rotation at 15° flexion (P=0.03).

Conclusions:

• The tested capsular plication techniques do not significantly increase hip external rotation compared to unrepaired capsulotomies.
• Excessive capsular plication may lead to disadvantageous outcomes, potentially impacting postoperative stability.
• Careful consideration of plication technique is warranted to avoid overcorrection and ensure optimal joint function.