Current Procedural Terminology (CPT) code 24358 represents an open surgical intervention primarily indicated for the treatment of chronic, refractory epicondylitis, commonly referred to as tennis elbow (lateral epicondylitis) or golfer's elbow (medial epicondylitis). This exhaustive procedure involves a tenotomy at the elbow, comprehensive debridement of the diseased soft tissue and/or bone, followed by the definitive repair or reattachment of the tendon. Epicondylitis is characterized by angiofibroblastic tendinosis, a degenerative condition of the common extensor origin (most frequently the extensor carpi radialis brevis for lateral epicondylitis) or the common flexor origin (for medial epicondylitis). When conservative treatments such as rest, activity modification, non-steroidal anti-inflammatory drugs, physical therapy, counterforce bracing, and corticosteroid or orthobiologic injections fail to provide relief after an extended period (typically 6 to 12 months), surgical intervention becomes necessary to restore upper extremity function and alleviate debilitating pain. The surgical technique for CPT 24358 typically begins with the patient placed under regional or general anesthesia. A localized incision is made over the affected medial or lateral epicondyle. The surgeon carefully dissects through the subcutaneous tissues to expose the underlying common extensor or flexor aponeurosis. A longitudinal incision is made in the aponeurosis, allowing the surgeon to identify the underlying degenerative, pathologic tissue, which often appears grey, friable, and edematous compared to the surrounding healthy tendon fibers. The core of the procedure involves the meticulous excision and debridement of this pathologic soft tissue. In addition to soft tissue debridement, the surgeon decorticates or lightly burrs the underlying bone of the epicondyle. This bony debridement serves a dual purpose: it removes any prominent bony osteophytes or exostoses that may be contributing to tendon irritation, and it stimulates a localized bleeding response, which brings marrow-derived elements to the surgical site to foster a robust healing environment. Once the debridement is complete, the crucial reconstructive phase of the operation is performed. The healthy margins of the native tendon are reattached to the prepared bony bed of the epicondyle. This reattachment or repair is typically achieved using transosseous sutures, suture anchors, or side-to-side suturing techniques to close the defect and restore the structural integrity of the aponeurosis. The wound is then irrigated, hemostasis is obtained, and the incision is closed in a layered fashion. A compressive dressing and often a splint are applied to immobilize the elbow and protect the repair during the initial phases of postoperative rehabilitation.