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PREVALENCE OF PALMARIS LONGUS TENDON AGENESIS IN A POPULATION OF MEDICAL STUDENTS
Paola Dias Tagliacozzo1, Camila Cassillo1, Julio Cesar Gali1
1Pontificia Universidade Catolica de Sao Paulo, Faculdade de Ciencias Medicas e da Saude, Sao Paulo, SP, Brazil.
Acta Ortopedica Brasileira
|February 16, 2026
Summary
The palmaris longus (PL) tendon is absent in 16% of medical students, more commonly in females and on the left side. This agenesis prevalence provides insights into anatomical variations.
Area of Science:
- Anatomy
- Human Variation
- Medical Education
Background:
- The palmaris longus muscle is a superficial forearm muscle.
- Palmaris longus tendon agenesis is a common anatomical variation.
- Understanding prevalence is crucial for clinical and surgical contexts.
Purpose of the Study:
- To determine the prevalence of palmaris longus tendon agenesis.
- To analyze agenesis in relation to gender and limb laterality.
- To contribute data on human anatomical variations.
Main Methods:
- Evaluated 100 medical students (200 antimeres) bilaterally.
- Utilized Schaeffer's test to assess tendon presence.
- Analyzed data for agenesis, gender, and laterality.
Main Results:
- Palmaris longus tendon agenesis observed in 16% (32/200) of antimeres.
- Agenesis was more frequent in females (21%) than males (11%).
- Tendon absence occurred more often in the left upper limb.
Conclusions:
- The prevalence of palmaris longus tendon agenesis is 16% in this medical student cohort.
- Agenesis shows higher frequency in females and on the left side.
- Findings highlight significant population-based variations in palmaris longus tendon presence.
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