Yan 2009.

Methods	Randomised controlled trial, parallel arms
Participants	26 patients (28 elbows) with recalcitrant lateral epicondylitis. The mean duration of conservative care was 23. 0 months (4 ‐ 60 months). The mean follow‐up was 17.4 months (4 ‐ 32 months)
Interventions	n=13 elbows treated with an open Nirschl procedure n=15 with an arthroscopic Nirschl procedure
Outcomes	Baseline and follow‐up: Pain: using VAS (visual analog scale) scores; Function: Mayo 12 points elbow scores; Time of return to work or sports; Participant satisfaction with procedure
Notes	Authors state in abstract that participants treated with the open surgical technique had 'better function in the return‐to work and sports' than the arthroscopic group