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Sex determination from femur. short note’s 5 marks

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Sex Determination from Femur

The femur is one of the most reliable long bones for sex determination from skeletal remains. Sexual differences become apparent only after puberty. Sex determination from the femur alone carries about 80% accuracy (Krogman).
Male (right) and female (left) femurs - the neck angle is more obtuse in the male
Male (right) and female (left) femurs - note the more obtuse neck angle in the male

Morphological Differences

FeatureMale FemurFemale Femur
HeadLarger; forms about 2/3rd of a sphereSmaller; forms less than 2/3rd of a sphere
Neck angleObtuse angle (~125° with the shaft)Almost a right angle with the shaft
General sizeLarger, heavier, rougherSmaller, slender, smoother
ShaftRougher, with prominent ridges and muscle attachmentsSmoother, thinner
CondylesLarger articular surfacesSmaller articular surfaces

Metric (Measurement-Based) Criteria

These are more objective and are preferred in forensic practice:

1. Vertical Diameter of the Femoral Head

The single most important metric for sex determination from the femur.
MeasurementSex
> 47 mmMale
45-47 mmIndeterminate
< 45 mmFemale
  • PC Dikshit values: Male = 47-49 mm; Female = 43-45 mm
  • Stewart's sectioning system: <43 mm = Female; 44-46 mm = Indeterminate; >47 mm = Male

2. Bicondylar Width (Distal End)

MeasurementSex
> 78 mm (or 74-89 mm range)Almost certainly Male
< 74 mm (or 67-76 mm range)Almost certainly Female

3. Total Length

Males have longer femurs (arm and leg bones are ~8% longer in males), but length alone has >10% overlap and cannot be used as a sole determinant.

4. Trochanteric Oblique Length

  • Male: ~390 mm
  • Female: ~450 mm (female pelvis is wider, altering this measurement)

Accuracy of Sex Determination

According to Krogman's accuracy estimates:
MethodAccuracy
Entire skeleton100%
Pelvis alone95%
Long bones (including femur)~80%
Long bones without pelvis/skull~50-60%

Key Points to Remember

  1. Sexual differences in the skeleton appear only after puberty - cannot sex pre-pubertal bones reliably.
  2. The femur is not used alone - it is assessed with the pelvis, skull, and other bones for better accuracy.
  3. The vertical diameter of the femoral head is the single most useful metric parameter.
  4. There is always a zone of overlap (indeterminate range), especially in the 44-46 mm range for femoral head diameter.
  5. Discriminant function analysis using multiple femoral measurements (introduced by Fischer in the 1940s) greatly improves accuracy over single-variable methods.
  6. Racial variation must be considered - reference values may differ across populations.
Sources: The Essentials of Forensic Medicine and Toxicology (36th ed., 2026); PC Dikshit Textbook of Forensic Medicine and Toxicology; Parikh's Textbook of Medical Jurisprudence; Forensic Anthropology: A Comprehensive Introduction (2nd ed.)
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