This study presents a survivorship analysis of Cotrel-Dubousset instrumentation in the surgical treatment of @entity2112 . Between 1987 and 1995, a total of 133 @entity1 with @entity2112 received posterior spine fusion and instrumentation with the CD system at our center. The @entity1 ' mean age at surgery was 16.5 years (range 11-43 years). The magnitude of the thoracic scoliosis averaged 62.7 degrees (range 40 degrees -125 degrees ) and that of the lumbar curve was 58.8 degrees (range 40 degrees -100 degrees ). On average, 12.2 segments were fused (range 8-17) and, excluding the rods, 14.1 implants were set for each @entity1 (range 10-21). Survivorship analysis was carried out using the Kaplan-Meier method. Implant removal was considered the terminal event, or " @entity204 ". The effect of several variables on survival rate was determined with the Cox regression method. The @entity1 remained in the study for 56.7 months (range 2-120 months). One-hundred and ten @entity1 were withdrawn ("censored"): 90 "alive" (did not require repeat surgery and attended follow-up control in 1997) and 20 "lost" (did not attend control in 1997). Twenty-three @entity1 attained the terminal event of implant removal for a variety of reasons: acute infection (three cases), late infection (ten cases), implant failure requiring revision (six cases) and @entity158 (four cases). The survival rate was 95.5% at 3 months, 94.7% at 6 months, 93.9% at 1 year, 91.5% at 2 years, 82.2% at 5 years and 76.5% at 10 years. The magnitude of the curves, total number of implants and number of fused segments did not correlate with survival probability. A positive correlation was found between survival rate and correction loss between surgery and last control. A survival rate of 76.5% at 10 years is unexpectedly low. Current data suggest that the incapacity to maintain correction after initial surgery plays a major roll in the long-term evolution of Cotrel-Dubousset instrumentation.

Survivorship analysis of Cotrel-Dubousset instrumentation in XXXX .

@entity1 :: ('9606', 'Species') :: ['patients', 'patient'] @entity2112 :: ('MESH:C564593', 'Disease') :: ['idiopathic scoliosis'] @entity204 :: ('MESH:D003643', 'Disease') :: ['death'] @entity158 :: ('MESH:D010146', 'Disease') :: ['local pain']
@entity2112 :: (MESH:C564593,Disease) :: ['idiopathic scoliosis']
