Post Market Clinical Follow-Up KeriFlex®

This is a post-market follow-up study monitoring the long-term safety and performance of the KeriFlex® joint implant used in finger joint replacement surgery (metacarpophalangeal or proximal interphalangeal joints). **You may be eligible if...** - You are 18 or older - You are about to have a finger joint replacement using a KeriFlex® implant - You have rheumatoid arthritis, osteoarthritis, or post-traumatic osteoarthritis affecting the finger joints **You may NOT be eligible if...** - You are pregnant or breastfeeding - You have an active local or systemic infection - Your bone quality or muscle condition is insufficient for the implant to work properly - You have a medical reason that prevents surgery - You have an intellectual disability preventing you from following post-surgical instructions Talk to your doctor to see if this trial is right for you.