Percutaneous screw fixation without bone grafting of scaphoid non-union.

BACKGROUND: Delays in diagnosis and inadequate treatment of acute scaphoid fractures can lead to non-unions, presenting surgeons with unique challenges regarding optimal management.

OBJECTIVES: To evaluate the clinical and radiographic outcome of scaphoid non-unions treated with percutaneous screw fixation.

METHODS: The study group comprised 12 patients with scaphoid non-unions of an average duration of 8.7 months. There were 11 males and 1 female with an average age of 24 years (range 14-47 years). All patients were initially treated with percutaneous screw fixation without bone grafting. A volar percutaneous approach was used in eight patients and a dorsal percutaneous approach in four. Wrist range of motion (ROM) and disabilities of the arm, shoulder, and hand (DASH) questionnaires were used to assess clinical outcomes. Postoperative radiographs were reviewed to assess the fracture union, carpal alignment and screw position.

RESULTS: Eleven of the 12 (92%) fractures united successfully with no additional procedures. These fractures achieved radiographic union at an average of 4 months. One patient with sickle cell anemia required revision fixation, which consisted of repeat percutaneous fixation and bone grafting. In this patient his non-union healed 3 months after the revision procedure. The average DASH score at final followup was 6 (range 0-16). Average wrist ROM was extension of 66 degrees (range 50-80) and flexion 71 degrees (range 55-90). None of the patients showed radiographic signs of osteoarthritis, osteonecrosis of the scaphoid, or hardware-related complications.

CONCLUSIONS: For scaphoid waist non-unions without collapse, percutaneous fixation without supplementary bone grafting provides satisfactory results with a high union rate, early return of function and minimal complications.