BACKGROUND:Compared with rigid internal fixation, semi-restricted non-fusion system (Cosmic) can reduce the destruction of lumbar physiological structure during operation, partly retain the range of motion, maintain the stability of surgical segment, and help to prevent the adjacent segment degeneration.
OBJECTIVE:To observe the mid-term folow-up outcome of semi-restricted non-fusion system (Cosmic) in the treatment of lumbar degenerative disease.
METHODS:21 patients with lumbar degenerative disease, including 10 male patients and 11 female patients, at the age of 19-63 years old, received posterior decompression by fenestration, nucleotomy, and Cosmic system internal fixation. Visual analogue scale score and Oswestry disability index were used for clinical evaluation. Intervertebral height and range of motion of surgical segment and the proximal adjacent segment were colected before and after operation.
RESULTS AND CONCLUSION: Al the patients were folowed up for 15-48 months. No internal fixator loosening or rupture was found during the folow-up. The visual analogue scale score and Oswestry disability index at the last folow-up were lower than those before operation (P < 0.01). During the last folow-up, there were no significant differences in the intervertebral height of surgical segment and the proximal adjacent segment, and the range of motion of surgical segment was lower than that before operation (P < 0.01). No significant difference was found in range of motion of the proximal adjacent segment. These results suggest that semi-restricted dynamic non-fusion system (Cosmic) can reduce the destruction of lumbar physiological structure during operation, partly retain the range of motion, maintain the stability of surgical segment, and help to prevent the adjacent segment degeneration with wel mid-term folow-up outcomes.