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Updated: Dec 17, 2025

Parameterizing V-notch Weir Equations for Flow Monitoring in a Drainage Control Structure
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The Relationship Between Canal Diameter and the Dorr Classification.

P N Karayiannis1, R S Cassidy1, J C Hill1

  • 1Primary Joint Unit, Musgrave Park Hospital, Belfast Health and Social Care Trust, Belfast, Northern Ireland.

The Journal of Arthroplasty
|June 24, 2020
PubMed
Summary
This summary is machine-generated.

Narrow femoral canals in hip replacement surgery are often challenging. A study found most narrow canals (≤10 mm) were Dorr B, not Dorr A, highlighting the need for preoperative measurement.

Keywords:
Dorr ADorr BDorr CDorr classificationcanal widthcementless total hip arthroplastynarrow canal

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Area of Science:

  • Orthopedic Surgery
  • Biomedical Engineering
  • Radiology

Background:

  • Broach-only uncemented total hip arthroplasty can be technically challenging with narrow femoral canals.
  • Traditionally, narrow femurs are classified as Dorr A, but the relationship with isthmus width is unclear.
  • No prior studies have investigated the correlation between femoral isthmus width and Dorr classification.

Purpose of the Study:

  • To determine the relationship between femoral isthmus width and Dorr classification in the context of total hip arthroplasty.
  • To assess the prevalence of narrow femoral canals (≤10 mm) within different Dorr classifications.

Main Methods:

  • A retrospective review of 500 high-quality radiographs was conducted.
  • Dorr classification and isthmus canal width (≤10 mm defined as narrow) were measured using an electronic caliper.
  • Intraobserver and interobserver errors were calculated for measurements.

Main Results:

  • The study included 8% Dorr A, 85% Dorr B, and 7% Dorr C femurs.
  • 63% of Dorr A femurs had a narrow isthmus (≤10 mm), compared to 13% of Dorr B femurs.
  • However, 69% of all narrow isthmuses (≤10 mm) were found in Dorr B femurs, indicating a higher overall prevalence in this group.

Conclusions:

  • In this cohort, nearly 70% of femurs with a narrow isthmus (≤10 mm) were classified as Dorr B.
  • Preoperative measurement of isthmus width on anteroposterior radiographs is recommended for broach-only techniques.
  • This measurement can alert surgeons to potential technical challenges associated with narrow femoral canals.