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01.12.2017 | Research article | Ausgabe 1/2017 Open Access

BMC Musculoskeletal Disorders 1/2017

Cervical spine reposition errors after cervical flexion and extension

Zeitschrift:
BMC Musculoskeletal Disorders > Ausgabe 1/2017
Autoren:
Xu Wang, René Lindstroem, Niels Peter Bak Carstens, Thomas Graven-Nielsen
Wichtige Hinweise

Electronic supplementary material

The online version of this article (doi:10.​1186/​s12891-017-1454-z) contains supplementary material, which is available to authorized users.

Abstract

Background

Upright head and neck position has been frequently applied as baseline for diagnosis of neck problems. However, the variance of the position after cervical motions has never been demonstrated. Thus, it is unclear if the baseline position varies evenly across the cervical joints. The purpose was to assess reposition errors of upright cervical spine.

Methods

Cervical reposition errors were measured in twenty healthy subjects (6 females) using video-fluoroscopy. Two flexion movements were performed with a 20 s interval, the same was repeated for extension, with an interval of 5 min between flexion and extension movements. Cervical joint positions were assessed with anatomical landmarks and external markers in a Matlab program. Reposition errors were extracted in degrees (initial position minus reposition) as constant errors (CEs) and absolute errors (AEs).

Results

Twelve of twenty-eight CEs (7 joints times 4 repositions) exceeded the minimal detectable change (MDC), while all AEs exceeded the MDC. Averaged AEs across the cervical joints were larger after 5 min’ intervals compared to 20 s intervals (p < 0.05).

Conclusions

This is the first study to demonstrate single joint reposition errors of the cervical spine. The cervical spine returns to the upright positions with a 2° average absolute difference after cervical flexion and extension movements in healthy adults.
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