The medial epicondyle groove space is the osseoligamentous tunnel posterior to the medial epicondyle through which the ulnar nerve passes, bounded anteriorly by the medial epicondyle, posteriorly by the olecranon, and roofed by the cubital tunnel retinaculum (Osborne's ligament). This is the most common site of ulnar nerve entrapment in the upper limb.
Cubital tunnel syndrome from ulnar nerve compression in the medial epicondyle groove produces ring and little finger numbness, intrinsic hand weakness, and medial elbow pain. The Tinel sign over the groove reproduces paresthesiae. Simple decompression releases Osborne's ligament; anterior transposition moves the nerve out of the groove. The groove space is measured on MRI for nerve cross-sectional area and flattening ratio.
Ulnar nerve compression in the medial epicondyle groove producing ring and little finger dysaesthesiae, intrinsic hand weakness, and a positive Tinel sign at the elbow, treated by groove decompression or anterior nerve transposition.
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