Cubital Tunnel Syndrome with First Dorsal Interosseous Muscle Weakness and Decreased Ulnar Nerve Conduction Velocity
Clinical Scenario
This protocol addresses cubital tunnel syndrome presenting with first dorsal interosseous muscle weakness or intrinsic hand muscle atrophy, confirmed by decreased ulnar nerve conduction velocity across the elbow on electrodiagnostic studies.
Electrodiagnostic finding: decreased ulnar nerve conduction velocity
Key Diagnostic Findings
Electrodiagnostic workup demonstrates decreased conduction velocity in the ulnar nerve at the elbow. Clinically, patients present with decreased 2-point discrimination, weakness on strength testing (grip and apposition pinch), and may show visible intrinsic hand muscle atrophy.
Treatment Approach (Overview)
The structured regimen for this presentation centres on surgical decompression of the ulnar nerve at the cubital tunnel. The specific operative technique — and whether nerve transposition or an alternative procedure is indicated — depends on intraoperative findings and the patient's individual anatomy.
The complete decision algorithm, indications, and procedural details are available in the full protocol.
References
DOI: 10.1016/j.jhsg.2022.07.008
- Moderate findings of EDX include decreased conduction velocity.
- Decreased 2-point discrimination, weakness on strength testing (grip and apposition pinch).
- The procedure involves releasing the points of compression from the ulnar nerve without mobilizing it anterior to the medial epicondyle and performing a soft tissue stabilization procedure.
- In situ decompression was the treatment of choice for the majority of members in patients without ulnar nerve subluxation.
- Currently, history or examination consistent with ulnar nerve instability, recurrent disease, and muscle atrophy are the most common indicators for transposition.
- Current indications for medial epicondylectomy include patients with hypermobile nerves, pre-existing vascular disease where transposition could potentially worsen ischemia, and thin patients.
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