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.
Observational (n=119)
Relative Risk: 9.5
Because the femoral head/neck junction is preserved in hip resurfacing, patients may be at greater risk of impingement, leading to abnormal wear patterns and pain. We assessed femoral head/neck offset in 63 hips undergoing metal-on-metal hip resurfacing and in 56 hips presenting with non-arthritic pain secondary to femoroacetabular impingement. Most hips undergoing resurfacing (57%; 36) had an offset ratio or= 50.5 degrees. Most hips undergoing resurfacing have an abnormal femoral head/neck offset, which is best assessed in the sagittal plane.
Beaulé et al. (Mon,) conducted a 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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