Post-traumatic Arthritic Stiff Knee in a Malunited Distal Femur Fracture Treated with Total Knee Arthroplasty – A Case Report

INTRODUCTION: Post-traumatic knee arthritis is defined as any structural osteochondral damage to the knee after an injury. About 12% cases of symptomatic osteoarthritis of the knee mainly due to post-traumatic arthritis. Primary total knee arthroplasty in a post-traumatic arthritic stiff knee with a malunited distal femur fracture is a technically difficult procedure due to secondary deformity, poor bone quality, bone loss, ligament incompetence, tissue adhesion, and stiffness. CASE REPORT: A 65-year-old male presented with chief complaints of pain and stiffness in the left knee for 15 years. On inspection no scar, sinuses, and dilated veins on palpation, tenderness was present over both the medial and lateral joint lines. Radiographs of the left knee in anteroposterior and lateral views were taken, which showed united distal femur fracture with Grade 4 Kellegren Lawrence knee arthritis. Due to severe knee stiffness and with the patient demanding early mobilization and functional knee ROM, total knee arthroplasty with intra-articular and extra-articular adhesion release was planned for the patient. CONCLUSION: In cases of post-traumatic arthritis with severe stiffness, total knee arthroplasty is a viable option in providing good pain relief with excellent functional improvement; however, the procedure is technically more demanding.