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Replacement Knee Joint, Right to Medial 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 | C Knee Joint, Right |
| Approach | 0 Open |
| Device | K Nonautologous Tissue Substitute |
| Qualifier | D Medial 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, Right
The knee joint replaced in this procedure is the tibiofemoral articulation, where the femoral condyles, tibial plateau, and often the patellar surface are resurfaced with metal and polyethylene components to relieve pain from advanced osteoarthritis, rheumatoid destruction, or post-traumatic degeneration. Total knee arthroplasty typically involves cutting and shaping the distal femur and proximal tibia to accept the prosthesis, with a plastic spacer substituting for the worn cartilage, and documentation should clarify whether the procedure is a total or unicompartmental replacement, since partial resurfacing of only the medial or lateral compartment may be captured differently. The right-sided designation matters for laterality tracking, particularly when a patient undergoes staged bilateral procedures.
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: Medial Meniscus
Medial Meniscus specifies that a repair or supplement procedure on the knee joint targets the fibrocartilage pad on the inner (tibial) side of the joint. It is used in Medical and Surgical section codes for meniscal tears or degeneration repaired via suture or reinforcement rather than the excision root operations used for meniscectomy. The paired qualifier, Lateral Meniscus, identifies the same procedure performed on the outer cartilage instead.
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.