Possibility of clinical application of tremor in the upper limb

A procedure to evaluate the function of the glenohumeral joint (i.e., shoulder joint) for persons with shoulder disorders was proposed by analyzing tremor. In order to compare subjects with shoulder disorders to healthy subjects without disorders, characteristics of tremor for the healthy persons under various angles of glenohumeral joint and under the dominant and no-dominant sides of the upper limb were obtained by peak frequency and power spectrum as basic data. As for the persons with rotator cuff injury, the ratio of total powers for the affected side and the healthy side was obtained as the affective side ratio. The ratio showed the characteristic of the persons with the disorder, and discriminated the total power spectra of persons who were healthy and those with disorders.