POSTERIOR INTEROSSEOUS NERVE ENTRAPMENT RELEASE SURGERY: A CASE REPORT AND REVIEW OF THE LITERATURE.

Objective: Describe the clinical and paraclinical characteristics of the PIN syndrome and the result of the PIN entrapment release surgery. Subjects and methods: A case report.

Results: Posterior interosseous nerve entrapment is a rare condition. We report a case of an 18-year-old male patient with no records of medical history. Five months before being admitted to the hospital, the patient began to experience progressive weakness and paralysis in finger extension movements. The patient was diagnosed with posterior interosseous nerve entrapment syndrome and was indicated for nerve release surgery. During the surgery, we found that the patient's posterior interosseous nerve was compressed by the Leash of Henry and by the fibrous band of the supinator muscle at the Arcade of Frӧhse, where the interosseous nerve passes through the supinator. The posterior interosseous nerve was completely released at five most compressed sites, and the patient was discharged after one day with a follow-up appointment and scheduled rehabilitation sessions. After 4 months of surgery, the patient has partially regained the ability to extend their fingers.

Conclusions: Compression of the posterior interosseous nerve is a rare upper limb neurological condition with a very low incidence rate. The typical clinical feature of the disease is a gradual paralysis of fingers extension without loss of wrist extension. The disease is diagnosed through clinical examination and paraclinical. If the cause of compression is at the radial tunnel, the posterior interosseous nerve needs to be decompressed at five most compressed sites. Results of the surgery after 4 months have helped the patient partially regain the ability to extend their fingers, but further long-term monitoring is still needed.