Purpose
The purpose of our study was to 3-dimensionally assess cam engagement in male patients
with symptomatic femoroacetabular impingement during motion.
Methods
A total of 13 hips with cam-type impingement were investigated. Patient anatomy and
clinical range of motion were determined. After 3-dimensional segmentation and reconstruction,
the dynamic behavior of the cam lesion was investigated for the previously analyzed
motions.
Results
Important differences in the pattern of cam engagement were noticed. Abutment of the
cam lesion and the acetabular cartilage was observed in flexion in 7 hips (54%) and
in abduction in 11 hips (84%). Internal rotation with the hip in 90° of flexion caused
intrusion of the cam lesion into the joint in 10 of the investigated cases (77%).
Neutral rotation did not cause any conflict between the cam lesion and acetabulum
for the measured range of motion. A similar area in the anterosuperior quadrant of
the acetabulum appeared to be involved in the different motions that were analyzed.
Conclusions
Typically, during internal rotation in 90° of flexion, the centromedial portion of
the cam lesion was found to abut against the anterosuperior quadrant of the acetabular
cartilage. During abduction and flexion, this appeared to be the lateral and medial
portions of the cam lesion, respectively. All motions causing cam intrusion appeared
to focus on the same cartilage area of the acetabulum in its anterosuperior quadrant.
Level of Evidence
Level II, diagnostic study.
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Article info
Publication history
Published online: October 18, 2010
Accepted:
June 29,
2010
Received:
January 11,
2010
Footnotes
Supported by Materialise NV, Heverlee, Belgium, and the Institute for the Promotion of Innovation through Science and Technology in Flanders (I.W.T.-Vlaanderen) through the 0&0 project grant 80192.
Identification
Copyright
© 2011 Arthroscopy Association of North America. Published by Elsevier Inc. All rights reserved.