Synthetic Mesh Allograft Reconstruction for Extensor Mechanism Insufficiency After Knee Arthroplasty

Area of Science:

• Orthopedic Surgery
• Biomaterials Science

Background:

• Extensor mechanism (EM) insufficiency is a severe complication following knee arthroplasty.
• Previous repair methods like primary repair and allografts have yielded suboptimal results.

Purpose of the Study:

• To evaluate the efficacy of synthetic mesh allograft reconstruction for EM insufficiency after knee arthroplasty.
• To assess functional outcomes, pain reduction, and complications associated with this technique.

Main Methods:

• Retrospective chart review of patients undergoing synthetic mesh EM reconstruction.
• Inclusion criteria: EM failure post-total or unicompartmental knee arthroplasty.
• Data collected: demographics, range of motion, extensor lag, pain scores, functional scores, and complications.

Main Results:

• Twelve patients (3 patellar tendon, 9 quadriceps tendon defects) were included.
• Mean follow-up of 27 months showed all patients were ambulatory with a mean extensor lag of 12.9°.
• Significant improvements in pain (VAS), Knee Society knee, and function scores were observed post-reconstruction (P<.01).

Conclusions:

• Synthetic mesh reconstruction is an effective method for restoring knee function in cases of EM deficiency post-arthroplasty.
• The technique demonstrates significant improvements in pain and function with a low complication rate (one infection).