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Spinal stability and intersegmental muscle forces. A biomechanical model.

M Panjabi1, K Abumi, J Duranceau

  • 1Department of Orthopaedics and Rehabilitation, Yale University School of Medicine, New Haven, Connecticut.

Spine
|February 1, 1989
PubMed
Summary
This summary is machine-generated.

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Intersegmental muscle forces stabilize the spine by reducing motion after injury, except in flexion. The neutral zone (NZ) is a better indicator of spinal instability than range of motion (ROM).

Area of Science:

  • Biomechanics
  • Spinal Anatomy
  • Musculoskeletal System

Background:

  • The human spine requires musculature for load-bearing capacity.
  • Spinal instability is a critical concern in orthopedic research and clinical practice.

Purpose of the Study:

  • To investigate the effect of simulated intersegmental muscle forces on lumbar functional spinal unit instability.
  • To compare the efficacy of Range of Motion (ROM) and Neutral Zone (NZ) as indicators of spinal instability.

Main Methods:

  • In vitro biomechanical testing of fresh lumbar functional spinal units.
  • Application of simulated intersegmental muscle forces under increasing loads.
  • Three-dimensional analysis of spinal motion and stability parameters.

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Main Results:

  • Muscle forces increased flexion ROM but decreased flexion NZ.
  • Muscle forces decreased both ROM and NZ in extension.
  • Lateral bending ROM and NZ were unaffected by muscle forces.
  • Axial rotation ROM decreased significantly, while NZ showed an insignificant decrease.

Conclusions:

  • Intersegmental muscle forces generally maintain or decrease intervertebral motion post-injury, with flexion being an exception.
  • The Neutral Zone (NZ) is proposed as a more sensitive indicator of spinal instability than Range of Motion (ROM).