c6aa2781_Bony_Landmark__0
[1] The site of the wrist extensors or the "mobile wad of 3" the brachioradialis, extensor carpi radialis longus, and the extensor carpi radialis brevis; also the brachioradialis originates from here [2] Stand at the patient's side and hold the anterior lateral aspect of the arm, move upward in a linear fashion from the lateral epicondyle, and palpate a short bony ridge, palpate up and down the ridge to get a good feel for its prominence [3] Located on the posterior distal end of the humerus above the lateral epicondyle [0] 
Lateral supracondylar ridge
Bony Landmark