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Skeletal Radiology

, Volume 39, Issue 2, pp 203–204 | Cite as

Cam-type FAI: is the alpha angle the best MR arthrography has to offer? (Skeletal Radiol. 2009;38(9):855–62)

  • Derek G. LohanEmail author
  • Leanne L. Seeger
  • Kambiz Motamedi
  • Sharon Hame
  • James Sayre
Letter to the Editor

The authors welcome this opportunity to respond to and clarify a number of issues raised by the letter of Drs. Beaulé and Rakhra in relation to our recent paper entitled “Cam-type FAI: is the alpha angle the best MR arthrography has to offer?” [1]

Drs. Beaulé and Rakhra express concern regarding our use of intra-operative femoral head–neck osteochondroplasty/arthroscopic debridement in differentiating between the presence or absence of cam-type femoral-acetabular impingement (FAI). Specifically, they refer to the potential of the introduction of significant observer bias using this approach, drawing particular attention to the discrepancy in experience between the two surgeons involved in this study (i.e. 10 versus 25 years). However, as stated in their letter, surgical intervention for FAI has gained mainstream acceptance only as recently as the turn of the century. Regardless of the existence or otherwise of a learning curve, both of these surgeons have therefore had similar time...

Keywords

Femoral Neck Femoral Head Alpha Angle Arthroscopic Debridement Trochanteric Osteotomy 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.

Notes

Open Access

This article is distributed under the terms of the Creative Commons Attribution Noncommercial License which permits any noncommercial use, distribution, and reproduction in any medium, provided the original author(s) and source are credited.

References

  1. 1.
    Lohan DG, Seeger LL, Motamedi K, Hame S, Sayre J. Cam-type FAI: is the alpha angle the best MR arthrography has to offer? Skeletal Radiol. 2009;38:855–62.CrossRefGoogle Scholar
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    Eijer H, Leunig M, Mahomed MN, Ganz R. Cross-table lateral radiographs for screening of anterior femoral head-neck offset in patients with femoro-acetabular impingement. Hip Int. 2001;11:38–41.CrossRefGoogle Scholar
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    Notzli HP, Wyss TF, Stocklin CH, Schmid MR, Treiber K, Hodler J. The contour of the femoral head-neck junction as a predictor for the risk of anterior impingement. J Bone Joint Surg Br. 2002;84:556–60.CrossRefGoogle Scholar
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    Kassarjian A, Yoon LS, Belzile E, Connolly SA, Millis MB, Palmer WE. Triad of MR arthrographic findings in patients with cam-type femoroacetabular impingement. Radiology. 2005;236(2):588–92.CrossRefGoogle Scholar
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    Nouh MR, Schweitzer ME, Rybak L, Cohen J. Femoroacetabular impingement: can the alpha angle be estimated? Am J Roentgenol. 2008;190:1260–2.CrossRefGoogle Scholar

Copyright information

© The Author(s) 2009

Open AccessThis is an open access article distributed under the terms of the Creative Commons Attribution Noncommercial License (https://creativecommons.org/licenses/by-nc/2.0), which permits any noncommercial use, distribution, and reproduction in any medium, provided the original author(s) and source are credited.

Authors and Affiliations

  • Derek G. Lohan
    • 1
    Email author
  • Leanne L. Seeger
    • 1
  • Kambiz Motamedi
    • 1
  • Sharon Hame
    • 1
  • James Sayre
    • 1
  1. 1.David Geffen School Of Medicine At UCLALos AngelesUSA

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