Short-Term to Mid-Term Outcomes of Arthroscopic Stabilization Using PEEK Knotless Anchors

Abstract

Outcomes of arthroscopic instability repairs vary depending on repair techniques and anchor materials. The purpose of this study is to determine the short to mid-term redislocation, resubluxation rate and clinical outcomes following arthroscopic stabilization of nonabsorbable, biologically inert polymer polyether ether ketone (PEEK) suture anchors. This is a retrospective study with 140 patients who underwent arthroscopic anterior stabilization surgery using PEEK (Pushlock) anchors with a mean follow-up of 40 months. Patient ranked pain scores, clinically assessed range of motion and strength testing were collected preoperatively and at 1, 6, 12, and 24 weeks after surgery with the final follow-up carried out as a phone interview. After surgery, the redislocation rate increased over time to 18% until it stabilized at 3.8 years. Resubluxation rate increased to 20% until 2.8 years. At 24 weeks, forward flexion, as well as shoulder strength in abduction, adduction, external rotation, internal rotation, and lift-off, improved compared with preoperative levels. Patient ranked pain scores and overall shoulder rating improved significantly at the most recent follow-up compared with before surgery. Arthroscopic stabilization of glenohumeral instability using PEEK knotless anchors results in good short-term to mid-term stability with improved function and reduced pain. Level of Evidence: Level III.