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Complications after surface replacing and silicone PIP arthroplasty: an analysis of 703 implants.

INTRODUCTION: The aim was to analyse complications after surface replacing and silicone proximal interphalangeal (PIP) joint arthroplasty.

MATERIALS AND METHODS: All complications, reoperations (subsequent intervention without implant modification) and revisions (subsequent surgery with implant modification or removal) were extracted out of our registry for two cohorts: (1) Patients who received a surface replacing arthroplasty at the PIP joint using the CapFlex-PIP prosthesis and (2) patients who received a PIP silicone implant. Furthermore, radiographs were evaluated for deviations from the longitudinal finger axis.

RESULTS: In our registry, 279 surface replacing implants and 424 silicone implants have been documented. The overall complication rate was 20% for surface replacements and 11% for silicone arthroplasties (p ≤ 0.01) with soft tissue-related events being the most prevalent in both groups. Reoperations were significantly more frequent after surface replacement (5.4%) than silicone arthroplasty (0.5%; p ≤ 0.001), while the revision rates did not differ significantly (4.4% and 3.3%, respectively; p = 0.542). Postoperative axis deviations were significantly less frequent in the surface replacement group (19% versus 58% for silicone arthroplasty; p ≤ 0.001).

CONCLUSION: We recommend using a surface replacing implant in fingers with preoperative axis deviations and correctable anatomical situation, bearing in mind the higher risk of a second surgery. However, treatment outcomes also need to be considered before choosing one implant over another.

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