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Factors Associated with Conversion from Conservative to Surgical Treatment in Single-Level Lumbar Spinal Stenosis Patients

보존적 치료 중인 단분절 요추관 협착증 환자에서 수술적 치료로 전환과 관련된 연관 인자

  • Ahn, Young-Joon (Department of Orthopedic Surgery, National Police Hospital) ;
  • Im, Se-Hyuk (Department of Orthopedic Surgery, National Police Hospital) ;
  • Park, Byung-Kyu (Department of Orthopedic Surgery, National Police Hospital)
  • 안영준 (국립경찰병원 정형외과) ;
  • 임세혁 (국립경찰병원 정형외과) ;
  • 박병규 (국립경찰병원 정형외과)
  • Received : 2018.10.19
  • Accepted : 2018.12.04
  • Published : 2018.12.30

Abstract

Study Design: Retrospective study of prospectively-collected data. Objectives: To determine the factors associated with conversion from conservative to surgical treatment in single-level lumbar spinal stenosis patients. Summary of Literature Review: Various reports have presented clinical outcomes after the surgical and nonsurgical treatment of spinal stenosis. However, few reports have investigated factors predicting conversion to surgery during the course of conservative treatment. Materials and Methods: We analyzed 40 patients who visited our hospital from May 2010 to May 2015 and were traceable for at least 3 years after being advised to undergo surgery following 3 months of conservative treatment. Of these patients, 20 underwent surgery and 20 did not. We then investigated the factors associated with conversion to surgical treatment. Clinical assessments were conducted using a questionnaire, and the overall area of the spinal canal and the muscle area within the spinal canal were measured using magnetic resonance imaging. Results: The average area of the spinal canal was $81.40{\pm}53.61mm^2$ in the surgical group, compared to $127.75{\pm}82.55mm^2$ in the nonsurgical group (p=0.042). The muscle area in the spinal canal was $5.17{\pm}1.30cm^2$ in the surgical group, whereas it was $6.40{\pm}1.56cm^2$ in the nonsurgical group (p=0.010). The patients in the surgical group were more likely to have experienced repetitive strain and to have frequently visited health clubs (p=0.047, p=0.037, respectively). However, regular stretching was more common in the nonsurgical group (p=0.028). Conclusions: The factors associated with conversion to surgical treatment were a narrow spinal canal, a small muscle area within the spinal canal, visiting health clubs, repetitive sprain, and not stretching. A small muscle area within the spinal canal can be considered as a key factor related to surgical conversion.

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