Table 2.

Potential radial nerve compression sites that may lead to RTS

Order	Location	Basis for compression	Sensory involvement
1	Lateral elbow joint in radial head	Osteoarthritis or fibrous bands anterior to the radiocapitellar joint or synovitis of the radiocapitellar joint.	May engage sensory area
2	Leash of Henry	An arcade of anastomosing branches of the recurrent radial artery at the radial neck	May engage sensory area
3	Fibrous edge of the ECRB	The leading (medial proximal) edge of the extensor carpi radialis brevis	May engage sensory area
4	The arcade of Frohse	The proximal edge of the superficial layer of supinator muscle	Does not engage sensory area
5	Distal edge of radial tunnel	The distal edge of supinator muscle	Does not engage sensory area