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Scoliosis  2012 

Cotrel-dubousset instrumentation for the correction of adolescent idiopathic scoliosis. Long-term results with an unexpected high revision rate

DOI: 10.1186/1748-7161-7-13

Keywords: Adolescent idiopathic scoliosis, Surgery, Outcome

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Abstract:

A total of 40 patients with AIS underwent CD instrumentation in our department within 3?years and between 1990 and 1992. For the retrospective analysis, first all the patient documents were reviewed, and pre-/postoperative X-ray images as well as those at the latest follow-up were analysed. Furthermore, it was attempted to conduct a clinical survey using the SRS-24 questionnaire, which was sent to the patients after a preceding announcement on the phone.Radiologically, the frontal main curvature was improved from a preoperative angle of 69.2° to a postoperative angle of 35.4°, and the secondary curvature was improved from a preoperative angle of 42.6° to a postoperative angle of 20.5°. The latest radiological follow-up at average 57.4?months post surgery showed an average loss of correction of 9.6° (main curvature) and 4.6° (secondary curvature), respectively.Within the first 30?days post surgery, 3 out of 40 patients (7.5%) received early operative revision for the dislocation of hooks or rods.At an average of 45.7?months (range 11 to 142?months), 19 out of 40 patients (47.5%; including 2 patients with early revision) received late operative revisions: The reasons were late infection (10 out of 40 patients; 25%) with the development of fistulae (7 cases) or putrid secretion (3 cases), which was resolved with the complete removal of instrumentation after all. The average time until revision was 35.5?months (range 14 to 56?months) after CD instrumentation. Furthermore, complete implant removal was necessary in 8 out of 40 patients (20%) for late operate site pain (LOSP). The average time until removal of instrumentation was 62.7 months (range 18 to 146?months) post surgery; and one patient received partial device removal for prominent instrumentation 11?months post surgery. Altogether, only 22 out of 40 CD instrumentations (55%) were still in situ.After an average period of 14.3 years post surgery, it was possible to follow-up 14 out of 40 patients (35%) using the SR

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