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Pelvis and Hip Measurements and Lines
Julia R. Crim, MD; Cheryl A. Petersilge, MD, MBA
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TERMINOLOGY

  • Synonyms

    • Center-edge angle = angle of Wiberg = lateral center-edge angle
    • Anterior center-edge angle = vertical center anterior margin angle (VCA)
  • Definitions

    • Acetabular depth: Coverage of femoral head by acetabulum
      • Measured by center-edge angle of Wiberg
        • Use both lateral and anterior center-edge angle
    • Coxa profunda: Descriptor for deep acetabulum
      • Medial wall of acetabulum medial to ilioischial line
      • Center-edge angle > 40°
    • Protrusio acetabulae: Descriptor for deep acetabulum
      • Medial cortex of femoral head medial to ilioischial line
    • Acetabular version: Relationship of anterior and posterior rims of acetabulum
      • Anteversion: Anterior rim is medial to posterior rim
      • Retroversion: Anterior rim is lateral to posterior rim
    • Femoral version: Rotation of femoral neck relative to femoral condyles
      • Anteversion: Femoral neck axis is anterior to axis of femoral condyle
      • Retroversion: Femoral neck axis is posterior to axis of femoral condyle
    • Sourcil: Weight-bearing portion of acetabular roof
      • Demarcated by sclerotic subchondral bone plate
    • Hilgenreiner line: Horizontal line joining superior margins of triradiate cartilage

IMAGING ANATOMY

  • Overview

    • Acetabular Roof Morphology

      • Acetabular Depth

        • Acetabular Version

          •  Femoral Head Coverage

            • Femoral Head Morphology

              • Femur

                • Mechanical Axis of Lower Extremity

                  ANATOMY IMAGING ISSUES

                  • Acetabular Overcoverage

                    • Acetabular Undercoverage

                      • Decreased Femoral Head-Neck Offset

                        Selected References

                        1. Tannast M et al: What are the radiographic reference values for acetabular under- and overcoverage? Clin Orthop Relat Res. ePub, 2014
                        2. Nepple JJ et al: Coxa profunda is not a useful radiographic parameter for diagnosing pincer-type femoroacetabular impingement. J Bone Joint Surg Am. 95(5):417-23, 2013
                        3. Anderson LA et al: Coxa profunda: is the deep acetabulum overcovered? Clin Orthop Relat Res. 470(12):3375-82, 2012
                        4. Werner CM et al: Normal values of Wiberg's lateral center-edge angle and Lequesne's acetabular index--a coxometric update. Skeletal Radiol. 41(10):1273-8, 2012
                        5. Delaunay S et al: Radiographic measurements of dysplastic adult hips. Skeletal Radiol. 26(2):75-81, 1997
                        6. Notzli HP et al: The contour of the femoral head-neck junction as a predictor for the risk of anterior impingement. J Bone Joint Surg. 84:556-560, 2002
                        7. Reynolds D et al: Retroversion of the acetabulum. J Bone Joint Surg. 81-B:281-288, 1999
                        8. Tonnis D et al: Diminished femoral antetorsion syndrome: a cause of pain and osteoarthritis. J Ped Orthop. 11:419-431, 1991
                        Related Anatomy
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                        References
                        Tables

                        Tables

                        TERMINOLOGY

                        • Synonyms

                          • Center-edge angle = angle of Wiberg = lateral center-edge angle
                          • Anterior center-edge angle = vertical center anterior margin angle (VCA)
                        • Definitions

                          • Acetabular depth: Coverage of femoral head by acetabulum
                            • Measured by center-edge angle of Wiberg
                              • Use both lateral and anterior center-edge angle
                          • Coxa profunda: Descriptor for deep acetabulum
                            • Medial wall of acetabulum medial to ilioischial line
                            • Center-edge angle > 40°
                          • Protrusio acetabulae: Descriptor for deep acetabulum
                            • Medial cortex of femoral head medial to ilioischial line
                          • Acetabular version: Relationship of anterior and posterior rims of acetabulum
                            • Anteversion: Anterior rim is medial to posterior rim
                            • Retroversion: Anterior rim is lateral to posterior rim
                          • Femoral version: Rotation of femoral neck relative to femoral condyles
                            • Anteversion: Femoral neck axis is anterior to axis of femoral condyle
                            • Retroversion: Femoral neck axis is posterior to axis of femoral condyle
                          • Sourcil: Weight-bearing portion of acetabular roof
                            • Demarcated by sclerotic subchondral bone plate
                          • Hilgenreiner line: Horizontal line joining superior margins of triradiate cartilage

                        IMAGING ANATOMY

                        • Overview

                          • Acetabular Roof Morphology

                            • Acetabular Depth

                              • Acetabular Version

                                •  Femoral Head Coverage

                                  • Femoral Head Morphology

                                    • Femur

                                      • Mechanical Axis of Lower Extremity

                                        ANATOMY IMAGING ISSUES

                                        • Acetabular Overcoverage

                                          • Acetabular Undercoverage

                                            • Decreased Femoral Head-Neck Offset

                                              Selected References

                                              1. Tannast M et al: What are the radiographic reference values for acetabular under- and overcoverage? Clin Orthop Relat Res. ePub, 2014
                                              2. Nepple JJ et al: Coxa profunda is not a useful radiographic parameter for diagnosing pincer-type femoroacetabular impingement. J Bone Joint Surg Am. 95(5):417-23, 2013
                                              3. Anderson LA et al: Coxa profunda: is the deep acetabulum overcovered? Clin Orthop Relat Res. 470(12):3375-82, 2012
                                              4. Werner CM et al: Normal values of Wiberg's lateral center-edge angle and Lequesne's acetabular index--a coxometric update. Skeletal Radiol. 41(10):1273-8, 2012
                                              5. Delaunay S et al: Radiographic measurements of dysplastic adult hips. Skeletal Radiol. 26(2):75-81, 1997
                                              6. Notzli HP et al: The contour of the femoral head-neck junction as a predictor for the risk of anterior impingement. J Bone Joint Surg. 84:556-560, 2002
                                              7. Reynolds D et al: Retroversion of the acetabulum. J Bone Joint Surg. 81-B:281-288, 1999
                                              8. Tonnis D et al: Diminished femoral antetorsion syndrome: a cause of pain and osteoarthritis. J Ped Orthop. 11:419-431, 1991