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Cervical spine reposition errors after cervical flexion and extension.

Xu Wang1,2, René Lindstroem1, Niels Peter Bak Carstens3

  • 1SMI, Department of Health and Science Technology, Faculty of Medicine, Aalborg University, Fredrik Bajers Vej 7D-3, 9220, Aalborg E, Denmark.

BMC Musculoskeletal Disorders
|March 15, 2017
PubMed
Summary
This summary is machine-generated.

The cervical spine shows an average 2° reposition error after flexion and extension movements in healthy adults. This study quantifies single joint reposition errors, revealing variability across cervical joints.

Keywords:
Cervical vertebraeFlexion and extensionFluoroscopyMotionNeckPosition senseRepositioningSpine

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Area of Science:

  • Biomechanical analysis of human movement.
  • Spinal kinematics and joint repositioning.

Background:

  • Upright head and neck posture is a standard baseline for diagnosing cervical spine issues.
  • Variability in cervical joint repositioning after movement is not well-understood.
  • Uncertainty exists regarding evenness of baseline position variance across cervical joints.

Purpose of the Study:

  • To assess reposition errors of the upright cervical spine in healthy adults.
  • To quantify single joint reposition errors following cervical motion.
  • To investigate the variability of cervical joint positions after returning to an upright stance.

Main Methods:

  • Video-fluoroscopy used to measure cervical reposition errors in 20 healthy subjects.
  • Subjects performed flexion and extension movements with specific time intervals.
  • Cervical joint positions analyzed using anatomical landmarks and external markers in Matlab.
  • Reposition errors calculated as constant errors (CEs) and absolute errors (AEs) in degrees.

Main Results:

  • All measured absolute errors (AEs) exceeded the minimal detectable change (MDC).
  • Twelve of twenty-eight constant errors (CEs) also exceeded the MDC.
  • Average AEs were significantly larger after 5-minute intervals compared to 20-second intervals (p < 0.05).

Conclusions:

  • This study provides the first demonstration of single joint reposition errors in the cervical spine.
  • Healthy adults exhibit an average absolute reposition error of 2° for the cervical spine after flexion and extension.
  • Findings highlight the inherent variability in cervical spine repositioning.