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Factors Affecting Clinical Results after Corrective Osteotomy for Lumbar Degenerative Kyphosis

Kim, Whoan Jeang    (Department of Orthopedic Surgery, Eulji University College of Medicine, Daejeon, Korea.   ); Kang, Jong Won    (Department of Orthopedic Surgery, Eulji University College of Medicine, Daejeon, Korea.   ); Kang, Sung Il    (Department of Orthopedic Surgery, Eulji University College of Medicine, Daejeon, Korea.   ); Sung, Hwan Il    (Department of Orthopedic Surgery, Eulji University College of Medicine, Daejeon, Korea.   ); Park, Kun Young    (Daejeon Veterans Hospital, Daejeon, Korea.   ); Park, Jae Guk    (Hongseong Medical Center, Hongseong, Korea.   ); Kwon, Won Cho    (Department of Orthopedic Surgery, Eulji University College of Medicine, Daejeon, Korea.   ); Choy, Won Sik    (Department of Orthopedic Surgery, Eulji University College of Medicine, Daejeon, Korea.  );
  • 초록

    Study Design This study is a prospective, clinical study for lumbar degenerative kyphosis. Purpose To determine the factors affecting postoperative clinical outcomes in patients who undergo corrective osteotomy for lumbar degenerative kyphosis. Overview of Literature Only a small number of studies have reported clinical results for surgery for lumbar degenerative kyphosis. There are almost no studies about prognostic factors that predict postoperative clinical results. Methods This study involved 25 patients who were diagnosed with lumbar degenerative kyphosis and who underwent corrective osteotomy following gait analysis. A pedicle subtraction osteotomy was done at the third lumbar vertebra (L 3). Regarding the fusion level, surgery was done within a range from T10 proximally to S1 distally. Of these, for rigid fixation of a distal part, an iliac screw was used. Pain was evaluated using a 10-point pain scale and a questionnaire about activities. We also evaluated cosmesis and subjective satisfaction using a modified version of the Scoliosis Research Society Outcome-22 (SRS-22) instrument. This assessment was done using a 5-point scale which was designed by us. We assigned patients to group A (good clinical outcomes) if their postoperative pain score was lower than 4 (of 10 points) and if scores indicating activity, cosmesis and subjective satisfaction were higher than 11 (of 15 points). All other patients were assigned to group B (poor clinical outcomes). Results Clinical outcomes were good in 64% of patients (16/25) and poor in 36% (9/25). Regarding cosmesis and subjective satisfaction, there were significant differences between the two groups. There were also significant differences in physical factors of individual patients such as body mass index (BMI): 23.78 ± 2.79 in group A and 26.44 ± 2.75 in group B. On gait analysis, there was a significant difference in the dynamic pelvic tilt: 7.5 ± 3.3° in group A and 11.72 ± 1.89° in group B. Conclusions There is no correlation between preoperative degree of kyphotic deformity and clinical outcomes. The degree of anterior rotation of pelvic tilt does not change significantly; rather, compensatory mechanisms of the pelvis and BMI were found to have more influence. Because neither the degree of satisfaction with clinical outcomes nor the increased activity was relatively higher, a more sincere decision should be made before recommending corrective osteotomy for degenerative lumbar kyphosis.


  • 주제어

    Lumbar degenerative kyphosis .   Dynamic pelvic tilt .   Radiological assessment .   BMI and clinical outcomes.  

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