In Vivo Randomized Controlled Study of the Bone Response of All-Suture Anchors and Biocomposite Anchors

BACKGROUND: Suture anchors are widely used for labral reconstruction surgery. However, there has been some concern over the development of osteolysis around the anchor. This has been reported for both biocomposite and all-suture anchors, but they have not been compared directly in vivo. PURPOSE: To compare the bone response to 2 common suture anchors: a traditional biocomposite push-fit anchor and an all-suture anchor. STUDY DESIGN: Randomized controlled trial; Level of evidence, 2. METHODS: Included in this study were 17 patients with a total of 37 unique suture anchors. Magnetic resonance imaging scans were performed at 3 weeks and 6 months postoperatively. A total of 38 senior radiologists and shoulder surgeons evaluated the images using a previously validated system for grading the bone response around suture anchors. The mean difference in grading at 3 weeks and 6 months was calculated using unpaired t tests, and the interrater reliability was evaluated with an intraclass correlation coefficient (ICC). RESULTS: At 3 weeks, there was no statistically significant difference in the degree of osteolysis surrounding each suture anchor type (P = .258), with little bone response. However, on the 6-month scans, there was a significantly lower level of osteolysis seen in the all-suture anchors compared with the biocomposite anchors (P = .040). Interrater reliability was excellent, with an ICC value of 0.975 (95% CI, 0.962-0.985). CONCLUSION: All-suture anchors cause significantly less osteolysis in glenoid bone at 6 months compared with biocomposite anchors.