抄録
We provided physical therapy for a patient with tendinitis of the Achilles tendon. She had pain with plantar flexion on standing. The characteristic finding of plantar flexion on standing in this case was varus instability in the foot from the early stage of movement, and the foot varus angle became largest in plantar flexion. Because the difference of muscle strength between the digitus primus side and the digitus minimus side was thought to be the cause of instability of the foot, we measured it using a hand-held dynamometer. From this measurement, weakness of output of muscle strength on the digitus minimus side was clear, and the following two problems were apparent: shift of the joint motion axis during ankle dorsal flexion, and decline of the muscle strength of the peroneus brevis, gastrocnemius and soleus. Instability in plantar flexion was improved by physical therapy paying attention to the joint motion shift and improvement of the pain was achieved.
