Measuring the Tibia: Trotter's Error Revisited.

Area of Science:

• Forensic Anthropology
• Human Osteology
• Biometric Analysis

Background:

• Trotter and Gleser's classic study defined tibia length measurement consistent with condylar-malleolar length.
• Subsequent research by Jantz et al. indicated Trotter's measurements omitted the malleolus, affecting stature estimation.
• The World War 2 (WW2) and Terry collections were impacted, with the WW2 sample no longer available for direct examination.

Purpose of the Study:

• To investigate uniformity in tibia measurement between the Terry and WW2 collections.
• To identify morphological differences between the Terry and WW2 tibia samples.
• To assess the continued validity of the 10 mm adjustment for malleolus omission in stature estimation.

Main Methods:

• Analysis of Trotter's "ordinary length" tibia measurement to infer her method for "maximum length."
• Comparison of measurement techniques and morphological characteristics between the Terry and WW2 collections.
• Evaluation of the proposed 10 mm adjustment based on observed data.

Main Results:

• No significant evidence of differential measurement between the WW2 and Terry collections, barring one minor series.
• Identification of slight morphological variations in the distal and/or proximal tibia between the Terry and WW2 samples.
• Confirmation that the 10 mm adjustment for malleolus omission remains valid despite observed morphological differences.

Conclusions:

• Trotter's tibia measurements, despite a documented omission, can still be reliably used for stature estimation with appropriate adjustments.
• The slight morphological differences between skeletal collections do not invalidate the established adjustment factor.
• The 10 mm adjustment proposed by Jantz et al. is supported by this re-analysis for accurate stature estimation in forensic contexts.