Femoral sulcus angle measurements

Area of Science:

• Orthopedic surgery
• Radiology
• Anatomy

Background:

• The femoral sulcus angle is a critical measurement in assessing knee joint alignment and diagnosing conditions like patellofemoral pain syndrome.
• Standardization of radiographic techniques is essential for reproducible clinical measurements.

Purpose of the Study:

• To evaluate the consistency of femoral sulcus angle measurements across three different radiographic knee projections: Merchant, Laurin, and Hughston.
• To determine if alternative radiographic views can reliably replace the Merchant view for measuring the femoral sulcus angle.

Main Methods:

• Seventy-four cadaveric knees were subjected to radiographic imaging using Merchant, Laurin, and Hughston projections.
• The femoral sulcus angle was measured for each projection on all specimens.
• Statistical analysis was performed to compare measurements between the different views.

Main Results:

• Measurements of the femoral sulcus angle showed no significant difference between the Merchant, Hughston, and Laurin projections (P = 0.0007).
• Mean angles were 138.6° (SD 6.9°) for Merchant, 137.4° (SD 7.6°) for Hughston, and 141.6° (SD 6.9°) for Laurin.
• The ranges of measurements were comparable across all three views.

Conclusions:

• The femoral sulcus angle measurement is consistent across Merchant, Laurin, and Hughston radiographic projections.
• Either the Hughston or Laurin view can be utilized as a reliable alternative to the Merchant view for measuring the femoral sulcus angle.
• This finding offers flexibility in radiographic knee imaging protocols.