XXXX due to degenerative spondylolisthesis.

@entity1 @entity1515 @entity3799 @entity1745
OBJECTIVE: To investigate clinical-radiological features of @entity3799 due to degenerative spondylolisthesis (DSL). METHODS: A total of 448 @entity1 were operated for @entity3799 at Nishitaga National Hospital between 2000 and 2003. Of these @entity1 , DSL at the symptomatic disc level was observed in 22 (4.9%) @entity1 . Clinical features were investigated by medical records, and radiological features were investigated by radiographs. RESULTS: Disc levels of DSL were C3/4 in 6 cases and C4/5 in 16 cases. Distance of anterior slippage was 2 to 5 mm (average 2.9 mm) in flexion position. Space available for the spinal cord (SAC) was 11 to 15 mm (average 12.8 mm) in flexion position and 11 to 18 mm (average 14.6 mm) in extension position; 11 cases were reducible and 11 cases were irreducible in extension position. Myelograms demonstrated compression of spinal cord by the ligamentum flavum in extension position. @entity1745 was not demonstrated in flexion position. C5-7 @entity1515 angle was lower than control. C5-7 range of motion (ROM) was reduced compared to controls. These alterations were statistically significant. CONCLUSIONS: DSL occurs in the mid-cervical spine. Lower cervical spine demonstrated restricted ROM and lower @entity1515 angle. Pathogenesis of @entity3799 due to DSL is compression of spinal cord by the ligamentum flavum in extension position and not by reduced SAC in flexion position.
