Ulnar nerve compression is common at the elbow, but less common at the wrist. The purposes of this study are to report a series of 9 patients with pure ulnar nerve deep branch compression by a ganglion and to evaluate the outcome following a surgical treatment. According modified Bishop's scoring system, the investigators would evaluate postoperative results of this uncommon nerve lesion.

Pre- and post-operative physical examination include assessment of tenderness and strength (grip and pinch). Grip strength and tip pinch strength between the thumb and index finger are measured using the E-LINK system. According Bishop's scoring system, the investigators redesign a questionnaire for comprehensive assessment of this uncommon nerve lesion.

Inclusion Criteria:

Ulnar nerve deep branch compression by a ganglion -

Exclusion Criteria:

Ulnar nerve deep branch compression caused by other reasons

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