Total Knee Arthroplasty in a Knee Locked in Extension: A Case Report

A native arthritic knee locked in full extension is a rare presentation to an orthopaedic clinic. Often, fixed deformity cases present with an element of fixed flexion due to either a mechanical or non-mechanical block, but a full extension deformity has not been reported in the literature. The treatment of these complex cases often involves consideration of the biopsychosocial impact of the deformity, and holistic patient care is warranted. This case report explores the symptoms, investigations, management, and postoperative recovery of a 60-year-old patient presenting with a rare fixed extension deformity. The condition had a significant impact on the patient's physical and psychological state, and its impact on quality of life should not be dismissed. Multiple imaging modalities and surgical options were considered prior to surgical management with total knee arthroplasty. The management of this condition was demonstrated to be suitably treated with total knee arthroplasty with good postoperative function and recovery. However, further larger study series are required to provide more robust evidence as to the optimal management strategy.