Identifying multiple reports from the same study.

摘要

To the Editor:We read with interest the article "A systematic review assessing the effectiveness of alendronate in reducing peri-prosthetic bone loss after ce-mentless primary THA" (http:// www.orthosupersite.com/view. aspx?rid=81547) in the April 2011 issue of ORTHOPEDICS. Two studies referenced in the article likely reported the same study (Tapaninen et al and Venesmaa et al). We compared the 2 articles strictly following the instructions of the Cochrane Handbook for Systematic Reviews of Interventions (Table).