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Related Concept Videos

Bones of the Lower Limb: Femur and Patella01:16

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The femur is the body's longest and strongest bone spanning the thigh region. Its head articulates with the acetabulum of the hip bone to form the hip joint. A minor indentation on the medial side of the femoral head, called the fovea capitis, serves as the site of attachment for the ligament of the head of the femur. This weak ligament spans the femur and acetabulum and supports the hip joint. The narrowed region below the head is the neck of the femur. The inclination angle between the...
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Related Experiment Video

Updated: Apr 17, 2026

Quantification of Levator Ani Hiatus Enlargement by Magnetic Resonance Imaging in Males and Females with Pelvic Organ Prolapse
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Does pelvic width influence patellar tracking? A radiological comparison between sexes.

C-C Wu1

  • 1Department of Orthopedic Surgery, Chang Gung Memorial Hospital, Chang Gung University, Kweishan, Taoyuan, Taiwan.

Orthopaedics & Traumatology, Surgery & Research : OTSR
|February 5, 2015
PubMed
Summary

Pelvic width does not differ between sexes. Apparent wider pelvis in women is due to height, not increased Q-angle, suggesting other factors cause patellar mal-tracking.

Keywords:
Anatomic axisMechanical axisPatellar trackingPelvic widthQ-angle

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Area of Science:

  • Orthopedics
  • Radiology
  • Anatomy

Background:

  • Pelvic width is theorized to influence patellar tracking via the quadriceps angle (Q-angle).
  • Common assumptions suggest wider pelvis and larger Q-angles in females compared to males.
  • Radiologic assessment offers an objective method to evaluate these anatomical relationships.

Purpose of the Study:

  • To investigate the accuracy of the assumption that pelvic width differs between sexes.
  • To radiologically compare pelvic width and its relation to lower extremity anatomy in males and females.
  • To determine if observed differences in pelvic width correlate with the quadriceps angle.

Main Methods:

  • Retrospective analysis of full-length standing X-rays from 100 adult patients (50 male, 50 female) aged 18-30 with unilateral lower extremity injury.
  • Measurement of pelvic width as the distance between bilateral femoral head centers.
  • Comparison of pelvic width and normalized pelvic width (to femur or combined femur-tibia length) between sexes.

Main Results:

  • No statistically significant difference in absolute pelvic width between males and females (P=0.74).
  • Significant differences observed in femur length and combined femur-tibia length between sexes (P<0.001).
  • Normalized pelvic width showed significant differences between sexes (P<0.001), and strong correlation between mechanical and anatomical axes angles (r=0.89).

Conclusions:

  • Absolute pelvic width is not a differentiating factor between male and female individuals.
  • Apparent relative pelvic width in females is likely attributable to differences in body height, not inherent pelvic structure.
  • Findings suggest that factors other than pelvic width differences are more critical in predisposing individuals to patellar mal-tracking.