The Relationship Between Canal Diameter and the Dorr Classification.

Autor: Karayiannis PN; Primary Joint Unit, Musgrave Park Hospital, Belfast Health and Social Care Trust, Belfast, Northern Ireland., Cassidy RS; Primary Joint Unit, Musgrave Park Hospital, Belfast Health and Social Care Trust, Belfast, Northern Ireland., Hill JC; Primary Joint Unit, Musgrave Park Hospital, Belfast Health and Social Care Trust, Belfast, Northern Ireland., Dorr LD; Dorr Institute for Research and Education, Pasadena, CA., Beverland DE; Primary Joint Unit, Musgrave Park Hospital, Belfast Health and Social Care Trust, Belfast, Northern Ireland.
Jazyk: angličtina
Zdroj: The Journal of arthroplasty [J Arthroplasty] 2020 Nov; Vol. 35 (11), pp. 3204-3207. Date of Electronic Publication: 2020 Jun 01.
DOI: 10.1016/j.arth.2020.05.066
Abstrakt: Background: Particularly in broach-only uncemented total hip arthroplasty, a narrow femoral canal presents a technical challenge. Traditionally such femurs have been considered to be Dorr A. To our knowledge, however, no study has reported on the relationship between isthmus width and the Dorr classification.
Methods: We reviewed 500 high-quality, hard copy radiographs. Dorr classification and isthmus canal width were measured using an electronic caliper by 5 independent observers with intraobserver and interobserver error calculated. For this study, we defined a narrow canal as being ≤10 mm at its narrowest point (isthmus).
Results: Eight percent (40) were Dorr A, 85% (424) Dorr B, and 7% (36) Dorr C. With respect to isthmus width for Dorr A, 63% (25) were ≤10 mm compared to just 13% (55) of Dorr B. However, overall because there were more Dorr B femurs, 69% of those with an isthmus of ≤10 mm were Dorr B.
Conclusion: In this population, almost 70% of patients with an isthmus ≤10 mm were Dorr B, with only 30% being Dorr A. When using a broach-only technique, isthmus width should be routinely measured on the preoperative anteroposterior radiographs so as to alert the surgeon to potential problems.
(Crown Copyright © 2020. Published by Elsevier Inc. All rights reserved.)
Databáze: MEDLINE
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