fabella; lateral fabella

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Introduction

A sesamoid bone in the tendon of the lateral head of the gastrocnemius muscle.

Epidemiology

  • present in 39% of people 2024
  • a century ago, 11% of the world's population had it

Pathology

Evolution

  • lateral fabella may have played a role in evolution of straight-legged, bipedal locomotion of humans, possibly beginning with Australopithecus[2]

More general terms

Additional terms

References

  1. Stedman's Medical Dictionary 27th ed, Williams & Wilkins, Baltimore, 1999.
  2. 2.0 2.1 Fragoso Vargas NA, Berthaume MA Easy to gain but hard to lose: the evolution of the knee sesamoid bones in Primates-a systematic review and phylogenetic meta-analysis. Proc Biol Sci. 2024 Jan;291(2030):20240774. PMID: https://www.ncbi.nlm.nih.gov/pubmed/39255841
  3. Sky News. Sept 11, 2024 https://news.sky.com/story/tiny-knee-bone-linked-to-arthritis-may-have-helped-humans-walk-upright-scientists-suggest-13212472