CPT® Code 27446

Arthroplasty of the knee, specifically CPT® Code 27446, refers to a surgical procedure known as a partial knee replacement or unicompartmental knee replacement. This operation is indicated for patients suffering from localized knee joint issues, typically affecting either the medial or lateral compartment of the knee. During the procedure, a surgical incision is made over the appropriate compartment, which allows the surgeon to access the knee joint directly. The choice of incision location—either on the medial or lateral side—depends on which compartment is being replaced. In some cases, an incision may be made on the anterior aspect of the knee to facilitate a more comprehensive exploration of the entire joint. The procedure involves careful inspection of the joint capsule and the compartments of the knee, followed by the exposure of the distal femur. A cutting guide is utilized to ensure that the bone is cut accurately, maintaining the proper alignment of the joint and leg angles. The preparation of the tibial surface is performed in a similar manner, ensuring that both the femoral and tibial components of the prosthesis fit securely. The prosthetic components can be either cemented or uncemented, with the choice depending on the specific requirements of the patient and the surgeon's preference. After the components are placed, the range of motion is assessed to ensure functionality before the soft tissues and skin are meticulously repaired in layers. This procedure aims to relieve pain and restore mobility in patients with degenerative joint disease or other knee-related conditions affecting a single compartment of the knee joint.