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In Vivo Quantification of Hip Arthrokinematics during Dynamic Weight-bearing Activities using Dual Fluoroscopy
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ProDisc-C: an in vivo kinematic study.

Neil Duggal1, Rudolf Bertagnoli, Doron Rabin

  • 1Division of Neurosurgery, London Health Sciences Center, London, Ontario, Canada. neil.duggal@lhsc.on.ca

Journal of Spinal Disorders & Techniques
|December 15, 2010
PubMed
Summary
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The ProDisc-C artificial disc increases cervical spine range of motion and shifts the center of rotation anteriorly at the surgical level. It also alters disc height and alignment at adjacent levels, impacting overall spinal biomechanics.

Area of Science:

  • Spine biomechanics
  • Orthopedic surgery
  • Artificial disc replacement

Background:

  • Cervical arthroplasty aims to preserve motion at the functional spinal unit (FSU) post-discectomy.
  • The biomechanical effects of the ProDisc-C artificial disc on in vivo kinematics and sagittal alignment require further investigation.

Purpose of the Study:

  • To quantify cervical spine biomechanical changes following ProDisc-C artificial disc implantation.
  • To assess the impact of ProDisc-C on range of motion, disc height, and sagittal alignment.

Main Methods:

  • Prospective study of 22 patients with single-level cervical spondylosis.
  • Collection and analysis of flexion/extension lateral radiographs pre- and post-ProDisc-C surgery.
  • Calculation of disc height, FSU angle, ROM, and COR using computer-assisted methods; statistical comparison using paired t-tests.

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Main Results:

  • ProDisc-C increased segmental ROM (P=0.03) and anteriorly shifted COR X (P=0.004) at the surgical level.
  • Significant increases in disc height were observed at the surgical level (P<0.0001).
  • Changes in disc height and FSU angle occurred at the inferior adjacent level, with no significant changes at the superior adjacent level.

Conclusions:

  • ProDisc-C enhances segmental ROM and shifts the COR anteriorly at the index level.
  • Disc height increases at the surgical level, while the surgical level becomes more lordotic.
  • The inferior adjacent level exhibits increased kyphosis post-implantation.