Foot and ankle muscle strength in people with gout
This study found that foot and ankle muscle strength in people with gout was different from healthy controls, and that muscle strength in people with gout was inversely correlated with pain and disability scores.
Gout is a common form of inflammatory arthritis in adults caused by the accumulation of monosodium urate (MSU) crystals in articular structures. Chronic gouty arthritis may develop with degenerative joint damage and often affects the structures of the foot and ankle. Despite the importance of lower limb muscle strength in daily activities such as walking, foot and ankle muscle strength in people with gout is poorly documented.
20 patients with currently inactive gout were included in this cross-sectional study, as well as 20 age- and sex-matched healthy controls. Muscle strength was tested by 5 isometric concentric contractions at velocities of 30 degrees/ sec and 120 degrees/ sec for both sides towards plantarflexion, dorsiflexion, inversion and eversion. Patient-reported pain and disability was assessed using the Manchester Foot Pain and Disability Index (MFPDI).
It was found that people with gout have significantly reduced plantarflexion, inversion and eversion ankle and foot muscle strength compared to healthy controls at both high and low contraction velocities. It also showed a negative correlation between muscle strength and pain and disability scores in people with gout, but not in healthy controls. The ankle dorsiflexors did not show the same strength deficits in people with gout, which may be related to crystal deposition patterns and decreased symptoms on the anterior aspect of the ankle.
> From: Stewart et al., Clin Biomech 32 (2017) 207-211. All rights reserved to Elsevier Ltd. Click here for the online summary.