The Use of the Posterior Lesser Trochanter Line to Estimate Femoral Neck Version

Femoral Neck Anteversion and Lesser Trochanteric Retroversion in Patients With Ischiofemoral Impingement: A Case-Control Magnetic Resonance Imaging Study

“…The angles were measured using a method based on studies performed by Unlu et al 4 and Shon et al 8 The method was developed by our research group. A preview analysis of the first 30 measurements in asymptomatic hips was made by Interclass Correlation IFS was considered as the smallest distance between the lateral cortex of the ischial tuberosity and medial cortex of the lesser trochanter; QFS was considered as the smallest space for passage of the quadratus femoris muscle delimited by the superolateral surface of the hamstring tendons and the posteromedial surface of the iliopsoas tendon or lesser trochanter.…”

Acetabular anteversion is associated with gluteal tendinopathy at MRI

“…FNAA was measured in axial plane and defined as the angle formed by a line bisecting circles of best fit placed within the femoral head and femoral neck and a horizontal line ( Fig. 4c) [13,15]. PLTL was measured in the same axial sequence and defined as the angle formed between a line passing tangential to the posterior cortex of the lesser trochanter and a horizontal line at the level of the largest width of the lesser trochanter ( Fig.…”

“…3. FNA was defined as the femoral neck axis angle (FNAA) minus the posterior lesser trochanter line (PLTL) [13][14][15]. FNAA was measured in axial plane and defined as the angle formed by a line bisecting circles of best fit placed within the femoral head and femoral neck and a horizontal line ( Fig.…”

“…PLTL was measured in the same axial sequence and defined as the angle formed between a line passing tangential to the posterior cortex of the lesser trochanter and a horizontal line at the level of the largest width of the lesser trochanter ( Fig. 4d) [13,15].…”

Automated femoral version estimation without the distal femur

“…CT or MR imaging would permit more accurate measurements by creating 3D models of the femur, however manually selecting the 3D femoral neck axis is challenging. This situation is further hampered in that the scan is limited to the region around the joint to limit radiation exposure, and does not include the distal femur for representation of the posterior condylar line . As such, alternatives to the posterior condylar line must be identified for accurate estimation of version.…”