Conservative treatment versus hip arthroscopy in patients with femoroacetabular impingement : a multilevel meta-analysis of randomized controlled trials.

A closer look at the forest plots ( Figure 8 and Figure 9 ; Supplementary Figures a to f, Supplementary Figure h) shows that the HAS subgroup has better mean values in almost every examined outcome parameter except for NRS ≤ 12 months post-intervention (Supplementary Figure g), which did not reach statistical significance.

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