CPT® Code 27429

The procedure described by CPT® Code 27429 refers to ligamentous reconstruction (augmentation) of the knee, which involves both intra-articular and extra-articular techniques. The knee joint is stabilized by four major ligaments: the anterior cruciate ligament (ACL), the posterior cruciate ligament (PCL), the medial collateral ligament (MCL), and the lateral collateral ligament (LCL). The ACL and PCL are crucial for the stability of the knee, connecting the femur to the tibia, while the MCL and LCL provide additional support on the inner and outer aspects of the knee, respectively. Although the MCL and LCL are less frequently injured, they may require surgical intervention in certain cases. In this procedure, intra-articular reconstruction focuses on repairing or augmenting the ACL or PCL by accessing the joint capsule directly. This involves incising the joint capsule, inspecting the damaged ligament, and removing it if necessary. The extra-articular component of the procedure utilizes structures outside the joint to provide additional reinforcement to the knee's stability. Techniques such as tightening the iliotibial tract may be employed to prevent lateral movement of the knee, although these extra-articular procedures are not commonly performed. The reconstruction process may involve harvesting graft material, such as the central third of the patellar tendon, which is then used to replace the damaged ligament. The procedure is intricate, requiring precise drilling and placement of grafts to ensure proper alignment and stability of the knee joint post-surgery. This combined approach allows for a comprehensive treatment of ligamentous injuries, addressing both intra-articular and extra-articular stabilization needs.