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Posterior interosseous nerve palsy

N Suematsu¹, T Hirayama

¹Department of Orthopaedic Surgery, Kitami Red Cross Hospital, Kitami, Japan.

Journal of Hand Surgery (Edinburgh, Scotland)

|May 8, 1998

Summary

This study classified non-traumatic posterior interosseous nerve paralysis into three types based on muscle involvement. Findings associate specific paralysis types with distinct compression sites within the supinator muscle.

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Area of Science:

Orthopedics
Neurology
Anatomy

Background:

Posterior interosseous nerve (PIN) palsy can result from various causes, leading to motor deficits.
Understanding the anatomical sites of nerve compression is crucial for diagnosis and treatment.

Purpose of the Study:

To investigate the relationship between clinical presentation of non-traumatic PIN palsy and specific anatomical locations of nerve compression.
To classify PIN palsy into distinct types based on affected muscle groups.

Main Methods:

Clinical assessment of eleven patients with non-traumatic PIN palsy.
Correlation of clinical findings with presumed sites of nerve compression within the supinator muscle.

Main Results:

Type 1 paralysis (drop finger and thumb) indicated simultaneous compression of the recurrent and descending branches of the PIN at the entrance and within the supinator muscle.
Type 2 paralysis (drop fingers) was associated with compression of the recurrent branch alone.
Type 3 paralysis (drop thumb) was linked to compression of the descending branch alone.

Conclusions:

The study identifies distinct patterns of PIN compression corresponding to clinical presentations.
Compression at the exit point of the supinator muscle is implicated in Types 2 and 3 PIN palsy.
Differentiating compression sites aids in targeted management of posterior interosseous nerve paralysis.

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