Rai S, et al. - Researchers reported on clinical outcome, regain of function, and complication of patients who had undergone primary constrained condylar knee (CCK)-total knee arthroplasty (TKA) for severe deformity of the knee secondary to post-traumatic arthritis. They also assessed the mid-term prostheses survival. Mid-term follow-up of primary CCK-TKA in post-traumatic arthritis provided satisfactory clinical and functional outcomes with 94.7% prostheses survival, despite severe deformity, instability, and stiffness at a relatively young age. Nonetheless, these outcomes were not without complications.