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Summarized effect of more than one study (closed circle) and one study only (open circles) demonstrating time course of (A) quadriceps muscle maximal voluntary strength (MVS) recovery, (B) voluntary muscle activation level (MVA); and (C) Cross-Sectional Area (CSA) or different time points comparing pre- to post-surgery values. Data were presented as effect size and its lower and upper limits of 95% confidence interval.
