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Replacement Knee Joint, Left to Lateral Meniscus with Nonautologous Tissue Substitute, Open Approach
Procedural Specifications
| Clinical Axis | Detail Definition |
|---|---|
| Section | 0 Medical and Surgical |
| Body System | S Lower Joints |
| Operation | R Replacement |
| Body Part | D Knee Joint, Left |
| Approach | 0 Open |
| Device | K Nonautologous Tissue Substitute |
| Qualifier | E Lateral Meniscus |
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, Left
As with its right-sided counterpart, replacement of the left knee joint addresses the tibiofemoral articulation, substituting the damaged femoral condyles and tibial plateau with prosthetic components to restore alignment and function lost to osteoarthritis or joint failure. Surgeons choose fixation methods such as cemented, cementless, or hybrid techniques depending on bone quality, and the operative record should note whether the patella was also resurfaced, since this affects the overall procedure but not the primary knee joint code. Left-sided cases are coded distinctly from right-sided ones to support accurate tracking of staged or sequential bilateral knee replacements, which are common given the frequency of symmetric degenerative change.
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: Nonautologous Tissue Substitute
Nonautologous Tissue Substitute refers to biologic material sourced from a donor or another species, such as an allograft or xenograft, used to replace a body part. It differs from Autologous Tissue Substitute by tissue origin outside the patient's own body, and from Synthetic Substitute by being biologic rather than manufactured material.
Qualifier: Lateral Meniscus
Lateral Meniscus identifies the outer (fibular-side) meniscal cartilage as the target of a knee repair or supplement procedure. It distinguishes the operative site from the Medial Meniscus qualifier, which denotes the inner cartilage pad, and is chosen based on which meniscus was actually treated regardless of which side of the knee is more commonly injured. Correct selection matters because medial and lateral meniscal injuries have different mechanisms and outcomes.
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.