Surgical Correction in Patients with Lumbar Degenerative Kyphosis Who Had Low Bone Mineral Density: An Analysis of 40 Patients with a Minimum Follow-Up of Two Years
- Alternative Author(s)
- Son, Eun Seok
- Publication Year
- Study Design: Retrospective study.
Purpose: To investigate influence of bone mineral density (BMD) on the surgical correction of lumbar degenerative kyphosis (LDK).
Overview of Literature: No studies so far have reported the influence of BMD on the surgical correction of LDK.
Methods: Forty LDK patients with more than 2 years follow-up were studied. Pelvic incidence (PI), pelvic tilt, sacral slope, sagittal
vertical axis (SVA), lumbar lordosis (LL), and thoracic kyphosis were measured preoperatively, immediate postoperatively and at final
follow-up. Adverse outcomes: proximal adjacent fractures, sagittal decompensation, pseudoarthrosis, and cage subsidence were
Results: There were 37 females and 3 males. Average age was 65.1±4.5 years and mean follow-up was 34.2±16.7 months. 42.5%
were Takemitsu type 3 curves, 27.5% type 2, 20.0% type 4 and 10.0% type 1. 37.5% had osteopenia, 40.0% osteoporosis and
22.5% had severe osteoporosis. SVA improved from 237.0±96.7 mm preoperatively to 45.3±41.8 mm postoperatively (p =0.000). LL
improved from 10.5°±14.7° to –40.6°±10.9° postoperatively (p =0.000). At final follow-up SVA deteriorated to 89.8±72.2 mm and LL to
34.7°±15.8° (p =0.000). The association between late sagittal decompensation, pseudoarthrosis, or proximal adjacent fractures and
osteoporosis was insignificant. The difference between immediate postoperative LL and PI (PIDiff) had a significant association with
sagittal decompensation and pseudoarthrosis.
Conclusions: Osteoporosis did not influence the degree of correction, late sagittal decompensation, proximal adjacent fractures, and
pseudoarthrosis in LDK. PIDiff had a significant association with sagittal decompensation and pseudoarthrosis.
Keywords: Lumbar degenerative kyphosis; Bone mineral density; Surgery; Outcome; Osteoporosis
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