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Replacement Knee Joint, Tibial Surface, Right to Uncemented with Synthetic Substitute, Open Approach
Procedural Specifications
| Clinical Axis | Detail Definition |
|---|---|
| Section | 0 Medical and Surgical |
| Body System | S Lower Joints |
| Operation | R Replacement |
| Body Part | V Knee Joint, Tibial Surface, Right |
| Approach | 0 Open |
| Device | J Synthetic Substitute |
| Qualifier | A Uncemented |
Operation Definition
Putting in or on biological or synthetic material that physically takes the place and/or function of all or a portion of a body part
Procedure Overview
Joint replacement in the lower extremities involves removing damaged or arthritic surfaces of a hip, knee, or ankle and implanting an artificial device that takes over the joint's function. Surgeons turn to this once medications, injections, and physical therapy no longer control the pain or stiffness of advanced osteoarthritis, rheumatoid arthritis, avascular necrosis, or a joint destroyed by prior trauma. The goal is restoring the ability to walk, climb stairs, and move without bone grinding on bone.
Implants are made of metal alloys, ceramic, or high-grade polyethylene, and a case can replace an entire joint (total) or a single compartment (partial). Recovery centers on physical therapy to build strength around the new joint; most patients regain substantial function within a few months, though the device will eventually wear and may need revision decades later.
Anatomy & Axis Detail
Knee Joint, Tibial Surface, Right
The tibial surface of the right knee joint is the proximal tibial plateau, the flattened bony platform that receives the femoral condyles and bears the majority of axial load transmitted through the leg. Replacement is indicated when arthritic destruction of the plateau's cartilage causes pain, malalignment, or joint instability that limits mobility. The procedure involves resecting the proximal tibia and fitting a metal tray, frequently paired with a polyethylene insert, to recreate a smooth bearing surface for the femoral component. Because the polyethylene insert is typically a mechanically related accessory rather than a separately reportable device, documentation should focus on confirming that the tibial tray placement is distinguished from the femoral surface component coded elsewhere.
Approach: Open
Open approach means the surgeon cuts through skin, mucous membrane, or other tissue layers to physically expose the target site to view before performing the procedure. It gives direct visualization and hands-on access, distinguishing it from Percutaneous approaches where instruments pass through a small puncture without exposing the site. Open is typical for procedures needing wide access, such as most laparotomies.
Device: Synthetic Substitute
Synthetic Substitute designates a device made from manufactured, non-biologic material, such as mesh or prosthetic components, used to replace or augment a body part. It is distinguished from the two tissue substitute categories by its artificial composition, which carries different considerations for integration and long-term durability than biologic grafts.
Qualifier: Uncemented
Uncemented qualifies a joint replacement procedure by indicating that the prosthetic component was designed with a porous or textured surface intended to allow bone to grow into it for fixation, without bone cement. It contrasts with the Cemented qualifier, and is often favored in younger or more active patients for its potential longevity.
Coding & Documentation
A coder assigns Replacement when the operative note documents removal of the native articular surface and insertion of a device meant to permanently substitute for it, not merely resurface it. Documentation should specify the joint, laterality, and whether the procedure was total or partial, since these drive qualifier selection. A common error is confusing partial resurfacing that leaves native bone intact with full Replacement, or missing that a revision arthroplasty swapping the entire prosthesis is still Replacement rather than Revision.