Decreased muscle strength and mobility of the neck in patients with rheumatoid arthritis and atlantoaxial disorders.
OBJECTIVE
To compare neck muscle strength and mobility of the cervical spine in rheumatoid arthritis (RA) patients with and without atlantoaxial (AA) disorders (anterior atlantoaxial subluxation [AAS], AA impaction).


METHODS
Clinical cross-sectional study.


METHODS
Outpatient rheumatology and rehabilitation clinics in a Finnish hospital.


METHODS
Patients with RA (N=124; mean age +/- standard deviation, 62+/-12y [corrected]) on a waiting list for orthopedic surgery. Thirty (24%) patients presented with AA disorders (16 with anterior AAS, 8 with AA impaction, 6 with a combination of anterior AAS and AA impaction).


METHODS
Not applicable.


METHODS
Neck function was measured by isometric neck strength and mobility tests, neck pain by a visual analog scale, erosion of the hands and feet by radiography, and the patients' function by the Health Assessment Questionnaire (HAQ).


RESULTS
Maximal neck muscle strength against flexion, extension, and rotation was lower in patients with AA disorders compared with the other patients in both women (P=.012) and men (P=.017). Mobility was lowest in the AA impaction group in all measured directions (P<.001). Peripheral erosive disease was more frequent in the group with AA disorders. They also had longer disease duration and were more disabled (HAQ) than the other patients.


CONCLUSIONS
Neck muscle strength is significantly decreased in patients with AA disorders. Mobility of the cervical spine is most limited in patients with AA impaction, but can be normal in cases with solitary anterior AAS.
Häkkinen
Arja
A
Department of Physical Medicine and Rehabilitation, Jyväskylä Central Hospital, Jyväskylä, Finland. arja.hakkinen@ksshp.fi
Neva
Marko Henrik
MH
Kauppi
Markku
M
Hannonen
Pekka
P
Ylinen
Jari
J
Mäkinen
Heidi
H
Jäppinen
Irma
I
Sokka
Tuulikki
T
D001172:Arthritis, Rheumatoid / Q000503:physiopathology*; D001268:Atlanto-Axial Joint / Q000503:physiopathology*; D002574:Cervical Vertebrae / Q000503:physiopathology*; D016009:Chi-Square Distribution; D003430:Cross-Sectional Studies; D005260:Female; D006801:Humans; D008297:Male; D008875:Middle Aged; D009334:Neck Muscles / Q000503:physiopathology*; D019547:Neck Pain / Q000503:physiopathology; D010147:Pain Measurement; D016059:Range of Motion, Articular