Proximal Interphalangeal Joint Silicone Arthroplasty for Osteoarthritis: Midterm Outcomes.

Background: Osteoarthritis of the proximal interphalangeal (PIP) joint affects a large percentage of the population and can lead to significant functional disability. The purpose of this study is to evaluate the midterm clinical effectiveness of PIP joint arthroplasty for nonrheumatic arthritis. Methods: A single-center retrospective cohort study evaluating preoperative and postoperative objective and subjective measures was conducted. Range of motion (ROM), Disabilities of the Arm, Shoulder and Hand scores, key pinch strength, grip strength, and satisfaction with respect to pain, deformity, function, and strength were measured. Results: Forty-five fingers in 25 patients were followed up for a mean period of 42 months. Preoperative and postoperative mean ROM was equivalent at 59.1° and 59.2°, respectively. Postoperative grip and key pinch strength showed significant improvement and near normalization compared with contralateral extremity. Complication rate was 37% with 20% requiring revision surgery. Patients with diabetes mellitus had higher odds of requiring revision surgery. Pain scores improved from 7.4 to 1.9 on a visual analog scale. Overall satisfaction was high at 84%, and 91% of patients would have the surgery performed again. Conclusions: Silicone arthroplasty for osteoarthritis of the PIP remains a good option for pain relief. Our study presents midterm follow-up data that support significant pain relief, increased grip and key pinch strength, and high satisfaction associated with this implant.