Where was the incision made for the lateral tennis elbow procedure?

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The incision is placed over the lateral epicondyle, the outer elbow bump where the common extensor tendon attaches (primarily the extensor carpi radialis brevis). Making the cut here gives direct access to the diseased tendon origin so the surgeon can clean up or lengthen the extensor tissues and relieve the painful area. Placing the incision elsewhere wouldn’t reach the injured tendon origin: the medial epicondyle is for the flexor-pronator group and relates to medial elbow problems, the olecranon is the back of the elbow and would target different structures, and an anterior elbow crease wouldn’t expose the extensor origin.