The Universal Clamp hybrid system: a safe technique to correct deformity and restore kyphosis in adolescent idiopathic scoliosis

摘要

Purpose Adolescent idiopathic scoliosis (AIS) is a tridi-mensional deformity characterized by coronal and sagittal profiles changes. We present a series of 62 patients affected by AIS and treated by thoracic Universal Clamps and transpedicular lumbar screws hybrid system. Methods Mean age was 13 years. Average pre-operative Cobb angle was 63deg +- 12deg. Patients were divided into two groups depending on the kyphosis angle: lower than 45deg (51 patients, 82.3 %, mean 21deg +- 3deg) and higher than 45deg (11 patients, 17.7 %, mean 62deg +- 6deg). Results The average percentage of coronal correction was 70 +- 3 % (mean post-operative Cobb angle 19deg +- 4deg, P < 0.001). In patients with pre-operative physiological thoracic kyphosis-hypokyphosis, we observed an increase in the average value (32deg +-4deg, P < 0.001), while in patients with pre-operative hyperkyphosis, mean decrease of thoracic kyphosis was 19deg +- 3deg (43deg +- 4deg, P < 0.001). Conclusions This case-series study showed the efficacy and safety of Universal Clamp hybrid system in correcting coronal deformity and restoring physiological thoracic kyphosis in patients affected by AIS.