The article "Results of 189 wrist replacements. A report from the Norwegian Arthroplasty Register" by Krukhaug at al. (2011) seems to represent a new trend in the reports of register studies. The advantage of arthroplasty register studies is the comparison of a very high number of implants operated in several clinics and thus, false results from inferior surgical skill and other nonprosthetic factors may be minimized. In the register study by Krukhaug et al. a comparison of three different wrist prostheses with 23, 76, and 90 (84) patients in each group has been carried out (the smallest group includes three different types of a developing prosthesis). This number is far beyond the lowest number of implants reported by any arthroplasty register in the literature. Only 52% of the wrist replacements performed in Norway in the same period was reported to the Arthroplasty Register compared to 99% for knee replacements according to the Norwegian Patient Register.
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