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Related Experiment Videos

Mastication causing segmental spinal motion in common cervical orthoses.

Kingsley R Chin1, Joshua D Auerbach, Samuel B Adams

  • 1Division of Spine Surgery, Department of Orthopaedics, Hospital of the University of Pennsylvania and the University of Pennsylvania School of Medicine, Philadelphia, PA 19104, USA. kingsleychin@hotmail.com

Spine
|February 17, 2006
PubMed
Summary
This summary is machine-generated.

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Cervical orthoses increase upper cervical spine motion during chewing. A two-poster brace is recommended for unstable spines, while a soft collar is suggested for stable spines to manage motion during mastication.

Area of Science:

  • Orthopedics and Biomechanics
  • Spinal Surgery
  • Rehabilitation Engineering

Background:

  • Cervical orthoses are commonly prescribed for spinal stabilization post-trauma or fusion.
  • Continuous wear, including during mastication, is sometimes recommended.
  • Understanding the impact of orthoses on cervical motion during eating is crucial.

Purpose of the Study:

  • To quantify segmental cervical spine motion during mastication.
  • To evaluate the effect of various cervical orthoses on this motion.

Main Methods:

  • In vivo fluoroscopic imaging was used to measure cervical spine motion.
  • Seven asymptomatic volunteers chewed gum under different orthotic conditions.
  • Segmental motion was quantified from fluoroscopy video stills.

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Main Results:

  • All tested cervical orthoses increased occiput-C1 and C1-C2 motion compared to no brace.
  • The two-poster brace resulted in the most motion at occiput-C1 (6.3 degrees).
  • Motion was greatest at the upper cervical levels and diminished below C4.

Conclusions:

  • The two-poster brace, with mandibular component removal, may help limit upper cervical motion in unstable spines during mastication.
  • A soft collar worn backward is proposed for stable spines.
  • Patient education on appropriate orthosis selection for mastication is recommended.