Comparison 7. Harms: arthroscopic surgery versus control.

Outcome or subgroup title	No. of studies	No. of participants	Statistical method	Effect size
7.1 Serious adverse events	8	1206	Risk Ratio (M‐H, Random, 95% CI)	1.35 [0.64, 2.83]
7.2 Total adverse events	9	1326	Risk Ratio (M‐H, Random, 95% CI)	1.15 [0.78, 1.70]
7.3 Progression of knee osteoarthritis	5	533	Risk Ratio (M‐H, Random, 95% CI)	1.25 [1.01, 1.54]
7.4 Subsequent knee surgery (replacement or high tibial osteotomy)	4	864	Risk Ratio (M‐H, Random, 95% CI)	2.63 [0.94, 7.34]