The alpha angle is an important indicator of femoroacetabular impingement of the cam type in patients with hip pain, yet its normal limits remain a matter of debate. A recent study examined the threshold value of the alpha angle in asymptomatic individuals using radiography, computed tomography and magnetic resonance imaging. It was found that the values differ significantly according to the imaging method. Consequently, there is no single value that reliably defines cam morphology, and measurements must be interpreted together with the clinical history.
Femoroacetabular Impingement
Wide variation in alpha angle measurement: a systematic review
Dr Alexandros P. Tzaveas
Orthopaedic Surgeon
Medical Disclaimer
This article is for information only and does not constitute medical advice. For an individual assessment, please consult your doctor.
Summary
- The alpha angle is an important indicator of femoroacetabular impingement of the cam type in patients with hip pain, yet its normal limits remain a matter of debate.
- A recent study examined the threshold value of the alpha angle in asymptomatic individuals using radiography, computed tomography and magnetic resonance imaging.
- It was found that the values differ significantly according to the imaging method.
- Consequently, there is no single value that reliably defines cam morphology, and measurements must be interpreted together with the clinical history.
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