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.
journal_name
BMC Musculoskelet Disordjournal_title
BMC musculoskeletal disordersauthors
Wang X,Lindstroem R,Carstens NP,Graven-Nielsen Tdoi
10.1186/s12891-017-1454-zsubject
Has Abstractpub_date
2017-03-13 00:00:00pages
102issue
1issn
1471-2474pii
10.1186/s12891-017-1454-zjournal_volume
18pub_type
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