Figure 4.

Forest plot summarizing the effects of postoperative protein supplementation (PS) plus exercise training (ET) on changes in muscle strength of (a) the involved leg and (b) the contralateral uninvolved leg over the overall follow-up period. The square represents the point estimate of the intervention effect for each trial. The horizontal line links the lower and upper limits of the 95% CI for the given effect. The area of the squares indicates the relative weight of the trials in the meta-analysis. Trial results plotted on the right-hand side of the vertical axis indicate effects in favor of protein supplementation. The combined effects are plotted using black diamonds. 95% CI, 95% confidence interval; Std, standard; IV, inverse variance; TJA, total joint arthroplasty.