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Lumbar spinal fusion using the Diapason system

Y Musha1, Y Okajima, M Motegi

  • 1Department of Orthopaedic Surgery, Toho University School of Medicine, Tokyo, Japan.

Journal of Spinal Disorders
|January 1, 1995
PubMed
Summary

The Diapason system achieved 97.1% bony union in lumbar spinal fusion for degenerative diseases. This semirigid fusion method demonstrated excellent clinical results and satisfactory outcomes in patients.

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Area of Science:

  • Spinal Surgery
  • Orthopedic Biomechanics
  • Spinal Fusion Devices

Background:

  • Lumbar spinal fusion is a common surgical procedure.
  • Evaluating the efficacy and biomechanical properties of spinal fusion systems is crucial.
  • The Diapason system is a spinal instrumentation used for lumbar fusion.

Purpose of the Study:

  • To evaluate the clinical outcomes and bony union rates of the Diapason system in lumbar spinal fusion.
  • To assess the intervertebral angulatory motion after surgery.
  • To investigate the biomechanical rigidity of the Diapason system through experimental study.

Main Methods:

  • Retrospective analysis of 34 patients undergoing lumbar spinal fusion with the Diapason system for degenerative diseases.
  • Clinical assessment using the Japanese Orthopaedics Association (JOA) score and radiographic evaluation of bony union and angulatory motion.

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  • Biomechanical testing to evaluate the system's rigidity and response to loading.

    • Main Results:

    • A mean improvement rate of 84.3% in JOA score was observed.
    • Successful arthrodesis (bony union) was achieved in 97.1% of patients.
    • Angulatory motion significantly decreased from 3 months to 1 year post-surgery, with 89.8% of segments showing no motion at 1 year. Biomechanical study indicated system elasticity rather than loosening.

    Conclusions:

    • The Diapason system provides satisfactory bony union in posterolateral lumbar fusion.
    • The semirigid nature of the Diapason system leads to excellent clinical results.
    • The system demonstrates good stability and efficacy for lumbar spinal fusion procedures.