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Letters to the Editor   |    
Relationship Between Polyethylene Wear and Osteolysis in Hips with a Second-Generation Porous-Coated Cementless Cup
Iain Chambers, FRCS1
1 18 Cloverdale GardensHigh HeatonNewcastle upon Tyne, NE7 7QJUnited Kingdomiain_claire_chambers@yahoo.co.uk
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The author did not receive grants or outside funding in support of his research or preparation of this manuscript. He did not receive payments or other benefits or a commitment or agreement to provide such benefits from a commerical entity. No commerical entity paid or directed, or agreed to pay or direct, any benefits to any research fund, foundation, educational institution, or other charitable or nonprofit organization with which the author is affiliated or associated.

The Journal of Bone and Joint Surgery, Incorporated
J Bone Joint Surg Am, 2004 May 01;86(5):1097-1098
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Extract

To The Editor:I read with interest the article "Relationship Between Polyethylene Wear and Osteolysis in Hips with a Second-Generation Porous-Coated Cementless Cup After Seven Years of Follow-up" (2003;85:1095-9), by Orishimo et al. However, the study methodology and the interpretation of the results are questionable.First, the study design analyzes retrospective radiographs, which presumably were not performed as part of the current study and may not have been sufficiently controlled to provide standardized projections. I am part of a team involved in radiographic assessment of total hip replacements, and one problem that we encountered when attempting to measure cup wear was the apparent alteration in cup inclination due to minor differences in patient positioning, which produced apparent differences in polyethylene wear. It seems that, even with the most exact measuring equipment, if radiographs are not standardized, then inconsistencies will occur.
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