Early repeated shim dislocations after oxford unicondylar replacement: A case report.

Introduction: Although shim dislocation is one of the post-UKA complications, the repeated shim dislocations early after the operation are rarely reported. Currently, no consensual clinical guideline for the reliable prevention and proper management of this complication has been available.

Case presentation: Two years ago, a 60s old female patient came to the hospital for treatment due to left knee joint pain for more than 10 years and the failure to release her suffering via conservative treatment. Given the evidence of X-ray (Fig. 1), the patient was diagnosed as left knee medial compartment osteoarthritis and was hospitalized for surgical treatment.

Clinical discussion: For a mobile platform UKA, whether it is an initial liner dislocation or a re-dislocation, revision to TKA is optimal when the underlying cause of the dislocation cannot be determined or corrected.

Conclusion: Standardized and precise surgical procedures as well as postoperative patient instructions are key factors in avoiding complications.