Published in:
10-06-2022 | Original Paper
Effect of surface replacing arthroplasty of the proximal interphalangeal joint using the CapFlex-PIP implant on distal interphalangeal and metacarpophalangeal joint range of motion — preliminary outcomes
Published in: European Journal of Plastic Surgery | Issue 1/2023
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Background
The CapFlex-PIP prosthesis (KLS Martin Group, Tuttlingen, Germany) shows favorable results in the medium term for surface-replacing arthroplasty of the proximal interphalangeal joint (PIP). At our department, we have been using this implant since 2019 with a dorsal approach to the PIP joint with a central tendon split. During the regular follow-up visits, we have noticed a reduction in the range of motion at the non-operated distal interphalangeal joints (DIP) during the postoperative course. We therefore wanted to evaluate the results of this group of patients with a focus on postoperative DIP active range of motion and total active motion (TAM).
Methods
From 2019 to 2020, a total of 29 consecutive CapFlex-PIP prostheses were performed using the mentioned surgical approach. Range of motions and the TAM were registered preoperatively, at 3, and 6 months postoperatively.
Results
No improvement in PIP range of motion was noted (mean 52.4° vs. 60.9° 6 months postoperatively, p = 0.06). But we noted a reduction in DIP range of motion (mean 39.3° vs. 24.9° 6 months postoperatively, p < 0.01). No statistically significant TAM reduction was observed (mean 170.5° vs. 166.2° vs mean, p = 0.2). At the MCP joints, we saw a statistically significant improvement of range of motion (mean 86.72° vs. 94.14° 6 months postoperatively, p = 0.02).
Conclusions
The dorsal approach to the PIP joint is easy and convenient for implant positioning. Our results suggest that this approach may lead to a reduction in DIP range of motion. Prospective studies are required to support the findings of this investigation.
Level of Evidence: Level IV, therapeutic study.