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Related Experiment Video

Updated: Apr 17, 2026

In Vivo Quantification of Hip Arthrokinematics during Dynamic Weight-bearing Activities using Dual Fluoroscopy

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Cam-type deformities: Concepts, criteria, and multidetector CT features.

J M Mellado¹, N Radi²

¹Hospital Royo Villanova, Zaragoza, España.

|February 10, 2015

Summary

This study reviews proximal femur anatomy and cam-type deformities, which can cause hip pain. It highlights limitations of the alpha angle and proposes imaging parameters for better characterization.

Keywords:

Anatomic variants Choque femoroacetabular Femoroacetabular impingement Femur Fémur Magnetic resonance imaging Multidetector computed tomography Resonancia magnética Tomografía computarizada multidetector Variantes anatómicas

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Area of Science:

Radiology
Orthopedic Surgery
Anatomy

Background:

Interpreting hip pain imaging requires regional anatomy knowledge.
Proximal femur variants like cam-type deformities can be asymptomatic or cause femoroacetabular impingement.
The alpha angle, a key criterion for cam deformities, has limitations.

Purpose of the Study:

To review anatomic variants of the proximal femur's anterior aspect.
To focus on cam-type deformities and their imaging characteristics.
To discuss the correspondence between imaging findings and historical anatomical/anthropological terms.

Main Methods:

Review of regional hip anatomy.
Analysis of cam-type deformities.
Utilizing diagrams and multidetector CT images.
Describing parameters for characterizing deformities across imaging techniques.

Main Results:

Detailed review of proximal femur anterior aspect variants.
Focus on cam-type deformities and their imaging parameters.
Discussion of imaging findings in relation to anatomical and anthropological terminology.

Conclusions:

Understanding proximal femur anatomy is crucial for interpreting hip imaging.
Cam-type deformities require careful characterization beyond the alpha angle.
Imaging findings can be correlated with historical descriptions of these phenomena.