Pre-operative image of a 78-year-old female patient with longstanding left-sided knee pain and a valgus (knock-knee) deformity. The knee x-ray demonstrates tricompartmental osteoarthritis with progressive cartilage loss that is most severe in the lateral compartment. In the post-operative image, the patient has now undergone a left total knee replacement. The new knee prosthesis restores the knee back to normal mechanical alignment and is well-balanced in flexion and extension using a gap-balancing technique.
