Compartment Tendon Associated Pathology 1 EPB APL De Quervain's tenosynovitis 2 ECRL ECRB Intersection syndrome 3 EPL Drummer's wrist, traumatic rupture with distal radius fx 4 EIP EDC Posterior interosseous nerve Extensor tenosynovitis 5 EDM Vaughn-Jackson Syndrome 6 ECU Snapping ECU