Knee joint instability after total knee replacement in a patient with Ehlers-Danlos syndrome: the role of insert changes as practical solution.

Treatment of knee joint instability in patients with hypermobile Ehlers-Danlos syndrome (EDS) can be challenging. A 53-year-old woman with hypermobile EDS underwent bilateral total knee replacement (TKR) due to valgus osteoarthritis. During follow-up, she developed hypermobility of both knee replacements. Revision of the insert resolved the issue in her left knee; however, the right TKR required two insert exchanges and unfortunately instability persisted. Therefore, a revision to a constrained prosthesis was performed. Insert exchanges in an unstable TKR can give short-term benefits, but for the long-term, we would recommend a constrained prosthesis.