Hip Labrum FAI Cam vs. Pincer Alpha Angle Calculator

Classify femoroacetabular impingement (FAI) using alpha angle and crossover sign. Cam FAI: alpha angle greater than 55 degrees on MRI AP view. Pincer FAI: lateral center-edge angle greater than 40 degrees or acetabular retroversion.

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🏅 Sports Note: These calculators provide estimates based on population data and validated formulas. Individual results vary by physiology, training level, and testing conditions. Consult a qualified coach or sports scientist for personalized guidance.
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How It Works

Classify femoroacetabular impingement (FAI) using alpha angle and crossover sign. Cam FAI: alpha angle greater than 55 degrees on MRI AP view. Pincer FAI: lateral center-edge angle greater than 40 degrees or acetabular retroversion

Each component has a specific meaning:

  • Alpha angle — The alpha angle recorded for the scenario being assessed.
  • Crossover sign — The crossover sign recorded for the scenario being assessed.

Note: Interpret the hip fai alpha angle result against the thresholds and context described above.

How to Use

Enter the alpha angle, crossover sign for the scenario you are assessing. Classify femoroacetabular impingement (FAI) using alpha angle and crossover sign. Cam FAI: alpha angle greater than 55 degrees on MRI AP view. Pincer FAI: lateral center-edge angle greater than 40 degrees or acetabular retroversion. Use the hip fai alpha angle result to inform your calculation.

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