The use of resurfacing implants (CapFlex-PIP) for fingers proximal interphalangeal joint osteoarthritis: satisfactory clinical and radiological results at 5-year follow-up

BACKGROUND: Destruction of PIP joint can be either a result of degenerative or post-traumatic process. When it is possible, movement-preserving surgery using an artificial joint is usually the treatment of choice. Various surface replacing implants have been developed, which follow the principles of surface replacement with a two-component concept.METHODS: In this retrospective study 30 fingers with diagnosis of PIP joint osteoarthritis treated with CapFlex-PIP resurfacing implants have been retrospectively re-evaluated. Pain on Visual Analogue Scale, range of motion, strength, functional (DASH score) and radiographic parameters were collected at the follow-up and compared to pretreatment values.RESULTS: At a mean follow-up of 27,72±15,39 months a statistically significative improvement of pain, range of motion, overall hand function and grip strength has been reported. Longitudinal axis deviation has ameliorated at the follow-up, no lateral instability has been described. Radiographic analysis at the follow-up revealed no signs of osteolysis, cyst formation, or fractures or radiolucent lines. One event of implant mobilization and one case of Boutonniere deformity has been observed.CONCLUSIONS: CapFlex-PIP implants can be considered a reasonable option for selected patients with PIP osteoarthritis, considering the significant pain relief and a trend towards improved hand function and range of motion.