Rotational osteotomy with single incision and elastic fixation for congenital radioulnar synostosis in children: a retrospective cohort study

Background: Derotational osteotomy remains the most commonly performed procedure in patients with congenital radioulnar synostosis (CRUS). Bone fixation is mostly performed using K-wires or plates. Many scars, loss of correction and neurovascular complications in the form were the most common complications across the studies. This report introduces a novel, minimally-invasive surgical approach, and reviews our experience. Methods: Twenty-seven children with CRUS were treated using the new technique, including bilateral forearms in 12 cases and unilateral forearm in 15 cases. A transverse osteotomy was performed at the ulnar and radial fusion site, the forearm was derotated osteotomy to the target position, intramedullary nailing was performed, and the elbow was flexed 90 degrees with a long-arm cast after surgery. One week after surgery, the forearm swelling disappeared, the long-arm cast was replaced, the elbow flexed at 90 degrees, and the forearm fixed in the maximum supination position for 4 weeks. Pre- and post-operative positions of the forearm were recorded; the pre- and post-operative activities of daily living (ADL) item scores were recorded for each patient. Results: All patients were followed up postoperatively for a mean duration of 20.7 months. The mean initial pronation deformity was 59.7 +/- 12.20 (40 to 100) degrees. The mean correction achieved was 51.2 +/- 14.50 degrees, resulting in a mean final position of 8.59 +/- 8.10 degrees of supination. 'Me fixed angles of forearm pronation after surgery were corrected to 0-20 degrees, with a mean of 8.33 degrees [standard deviation (SD) 7.98 degrees), and the difference was statistically significant compared with that before surgery (P<0.01). The patients' pre-and post-operative ADL item scores were 3.6 and 4.5, respectively, which was a 0.9-point change and was statistically significant (P<0.01). After surgery, 26 patients obtained good healing, and only one patient had delayed union, which was healed with forearm immobilization for a further month. Conclusions: Rotational osteotomy with single incision and elastic fixation for CRUS in children is a simple operation, and provides advantages including small trauma, fewer postoperative complications, and good efficacy.