The evidence that tennis elbow is caused by poor muscle strength and improper tennis stroke is strong. The lesion may be at the lateral epicondyle (70 to 80% of patients), at the musculotendinous junction at the level of the radial head or, rarely, at the medial condyle. Anti-inflammatory steroid injections in the condylar lesions are helpful. Sinusoidal wave stimulation of the affected muscles, or repetitive active wrist dorsiflexion, is important in the early stages. The recurrence rate drops sharply when patients adhere to a progressive exercise program.
网球肘由肌肉力量不足和网球击球动作不当引起的证据很充分。病变可能位于外侧髁（70%至80%的患者）、桡骨头水平的肌腱结合处，或极少情况下位于内侧髁。对髁部病变进行抗炎类固醇注射是有帮助的。在早期，对受影响的肌肉进行正弦波刺激或反复主动腕背伸很重要。当患者坚持渐进性锻炼计划时，复发率会大幅下降。
