Decreased neck muscle strength is highly associated with pain in cervical dystonia patients treated with botulinum toxin injections.

Objectives: To compare the isometric neck muscle strength of cervical dystonia patients treated with botulinum toxin injections with that of healthy control subjects and to evaluate the association between neck strength, neck pain, and disability in these patients.

Design: Clinical cross-sectional study.

Setting: Outpatient rehabilitation and neurology clinics in a Finnish hospital.