Both of the following conditions would have local epicondyle tenderness.

Extensors

Lateral epicondyle: tennis elbow.

Pain is triggered by resisted wrist extension, because the forearm extensors are affected and this exertion induces tenderness.

Flexors

Medial epicondyle: golfer’s elbow.

Conversely, pain is triggered by resisted wrist flexion.

References

1. Walker, B. R., Colledge, N. R., Ralston, S., & Penman, I. D. (2014;2013;). Davidson’s principles and practice of medicine (22nd ed.). Edinburgh: Churchill Livingstone/Elsevier.
2. Tennis Elbow (Lateral Epicondylitis). (2017). OrthoInfo. Retrieved 11 April 2017, from http://orthoinfo.aaos.org/topic.cfm?topic=a00068
3. Tennis Elbow and Golfer’s Elbow. (2017). Patient.info. Retrieved 11 April 2017, from https://patient.info/doctor/tennis-elbow-and-golfers-elbow