The fifth extensor compartment contains only the extensor digiti minimi tendon, running over the distal ulna. The EDM has two slips in this compartment in approximately 70% of individuals.
| Location | Dorsal wrist, over the distal radioulnar joint |
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Guides the little finger extensor across the back of the wrist and allows independent little finger extension.
Fifth compartment release is performed for EDM tenosynovitis and as part of rheumatoid dorsal wrist synovectomy. The two EDM slips within the compartment are identified to ensure complete decompression. ECU tendon subluxation (sixth compartment) is assessed simultaneously as the fifth and sixth compartments share the distal ulna.
Inflammatory tenosynovitis of the extensor digiti minimi in its compartment producing ulnar dorsal wrist pain, released surgically in refractory cases.
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