CPT® Code 27331

The procedure described by CPT® Code 27331 refers to an arthrotomy of the knee, which is a surgical intervention involving a skin incision made over the knee joint. This procedure allows for direct access to the knee joint, enabling the surgeon to explore the joint cavity, perform a biopsy, or remove any loose or foreign bodies that may be present. During the operation, the surgeon dissects through the surrounding tissues to expose the joint capsule, which is then opened to gain access to the interior of the knee joint. Once the joint is accessed, it is typically flushed with a saline solution to clear away any debris that may be present, ensuring a clean working environment for examination. The surgeon thoroughly inspects the joint for signs of injury or disease, which may include conditions such as arthritis or other joint disorders. If necessary, a synovial biopsy may be performed, where samples of the synovial tissue—responsible for producing synovial fluid—are collected for further laboratory analysis. This tissue can become inflamed due to various conditions, including rheumatoid arthritis. After the exploration and any necessary interventions, such as the removal of loose or foreign bodies, the knee joint is flushed again with saline, and the incision is meticulously closed in layers to promote proper healing.