Revision TKA for Flexion Instability Improves Patient Reported Outcomes

Area of Science:

• Orthopedic surgery
• Biomedical engineering
• Knee biomechanics

Background:

• Instability is a primary reason for early revision of total knee arthroplasty (TKA).
• Flexion instability represents a significant portion of these revision cases, impacting patient function and satisfaction.

Purpose of the Study:

• To evaluate radiological corrections, patient-reported outcomes, and complications following revision TKA specifically for flexion instability.
• To assess the effectiveness of surgical intervention in addressing flexion instability in TKA patients.

Main Methods:

• Retrospective cohort study of 37 patients undergoing revision TKA for flexion instability.
• Minimum one-year follow-up period.
• Analysis included radiological measurements (posterior condylar offset ratio, tibial slope, joint line level) and patient-reported outcomes (Knee Society Score, Likert scale).
• Level IV evidence: Case series.

Main Results:

• Significant improvement in mean posterior condylar offset ratio post-surgery.
• Significant decrease in tibial slope after revision surgery.
• No significant alteration in the joint line level was observed.
• Patient-reported Knee Society Score showed significant improvement.
• 26 out of 37 patients (70.3%) reported perceptible improvement on a 7-point Likert scale.

Conclusions:

• Revision TKA for flexion instability can lead to favorable radiological corrections.
• The procedure significantly improves patient-reported outcomes and satisfaction.
• Surgical intervention is a viable option for managing flexion instability in TKA, enhancing functional recovery.