The purpose of this systematic review is to describe the pathoanatomy, presentation, diagnostic workup, treatment modalities, and outcomes of posterior interosseous nerve (PIN) palsy in patients with rheumatoid arthritis (RA). All reported cases of PIN palsy in patients with RA were reviewed to yield 72 cases of PIN palsy in 70 patients. The male-to-female ratio was 1:2.7. Pain involving the elbow was very common (20/33 cases reporting this information), and paralysis or weakness of digit extension was noted in 27/33 cases and 6/33 cases, respectively. Only 1 of the 54 cases undergoing surgical intervention reported persistent weakness, and this 1 patient had undergone a 3-month trial of conservative management. In conclusion, Appropriate pharmacologic management in conjunction with magnetic resonance imaging (MRI) and ultrasound monitoring may be used for conservative management, but surgical decompression should still be utilized for patients with a compressive disease pathology who fail to improve with 6 weeks of conservative treatment, or for those with advanced disease on initial presentation.
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