Key result
A femoral head/neck offset ratio ≤0.15 was associated with a 9.5-fold increased relative risk of having an alpha angle ≥50.5 degrees.
Why the study?
What is the relationship between femoral head/neck offset ratio and alpha angle in hips undergoing resurfacing or with femoroacetabular impingement?
Population
63 hips undergoing metal-on-metal hip resurfacing and 56 hips presenting with non-arthritic pain secondary…
Design
Cross-sectional
Authors
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May inform FAI screening via offset ratio in resurfacing candidates; hypothesis-generating and requires prospective validation before practice change.
Observational (n=119)
What is the relationship between femoral head/neck offset ratio and alpha angle in hips undergoing resurfacing or with femoroacetabular impingement?
Relative Risk: 9.5
Most hips undergoing resurfacing have an abnormal femoral head/neck offset, which correlates with an increased alpha angle and is best assessed in the sagittal plane.
Beaulé et al. (2007) conducted an observational in Hip resurfacing and femoroacetabular impingement (n=119). Femoral head/neck offset ratio ≤0.15 vs. Offset ratio >0.15 was evaluated on Alpha angle ≥50.5 degrees (RR 9.5). A femoral head/neck offset ratio ≤0.15 was associated with a 9.5-fold increased relative risk of having an alpha angle ≥50.5 degrees.
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