Net Promoter Score: a prospective, single-centre observational study assessing if a single question determined treatment success after primary or revision hip arthroplasty.

At 12 months, promoters in Group 3 also displayed mostly better PROM scores than detractors, however, these differences were only significant for very few PROM scores (Tables 5 and 6 : Pain intensity at 12 months), while a slightly higher number showed a statistical trend (0.05 < p < 0.1), e.g.

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