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Revision surgery. Forest plot comparing risk ratios of revision and planned revision surgery after total hip arthroplasty versus hemiarthroplasty in displaced femoral neck fractures in the healthy elderly. Mantel-Haenszel statistical method was used with the ‘random effects’ analysis method for dichotomous data. M-H Mantel-Haenszel, THA total hip arthroplasty, HA hemiarthroplasty
