Occupational manual activity is reflected on the patterns among hand entheses

Area of Science:

• Anthropological sciences
• Paleoanthropology
• Bioarchaeology

Background:

• Entheses (bone sites where tendons attach) are used as occupational stress markers in anthropology.
• Understanding how entheseal surfaces react to mechanical loading is crucial but not well-established.
• Previous studies often relied on occupation-at-death, with limited understanding of specific habitual activity impacts.

Observation:

• A skeletal sample of 45 adult males from mid-19th century Basel with documented occupations was analyzed.
• A three-dimensional quantification system was employed to examine hand entheseal patterns.
• Principal component analysis and correlation tests assessed entheseal patterns against age, body mass, and bone length.

Findings:

• Previously proposed entheseal patterns were confirmed in the sample.
• Individuals with similar occupations exhibited similar entheseal patterns, independent of age, body mass, or bone length.
• Distinct entheseal patterns were associated with different types of manual labor and muscle group usage.

Implications:

• Hand entheseal patterns can reliably indicate habitual manual activity and associated muscle use.
• This research refines the use of entheses as occupational stress markers in anthropological studies.
• The findings provide a more nuanced understanding of skeletal adaptations to mechanical loading from daily activities.