Posterior Interosseous Nerve Compression G56.80 354.8

synonyms: PIN Compression, PIN Syndrome, Posterior interosseous nerve syndrome, PIN palsy, Posterior interosseous nerve palsy

PIN Compression ICD-10

• G56.80 - Other specified mononeuropathies of unspecified upper limb
• G56.81 - Other specified mononeuropathies of right upper limb
• G56.82 - Other specified mononeuropathies of left upper limb

• G56.90 - Unspecified mononeuropathy of unspecified upper limb
• G56.91 - Unspecified mononeuropathy of right upper limb
• G56.92 - Unspecified mononeuropathy of left upper limb

PIN Compression ICD-9

• 354.8 other mononeuritis of upper limb

PIN Compression Etiology / Epidemiology / Natural History

• May occur in up to 5% of pts with Lateral Epicondylitis .

PIN Compression Anatomy

• Most common site of compression is the arcade of Frohse.
• Other sites of compression: leash of Henry, ECRB / ECRL, Supinator muscle.
• PIN innervates the  EDC followed by the ECU, EDQ, EIP.
• In terms of recovery after nerve injury the EIP is the most distal muscle innervated recovers last. First to return is EDC followed by the ECU, EDQ.  Last is EIP.

PIN Compression Clinical Evaluation

• Pain located directly over the site of PIN compression 3-4 cm distal to the lateral epicondyle (Werner CO, Acta Orthop Scand Supp 1979 174:1)

PIN Compression Xray / Diagnositc Tests

PIN Compression Classification / Treatment

PIN Compression Associated Injuries / Differential Diagnosis

PIN Compression Complications

PIN Compression Follow-up Care

PIN Compression Review References

• Lubahn JD, JAAOS 1998;6:378