Enthesis

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Connective tissue which attaches tendons or ligaments to bones

title: "Enthesis" type: doc version: 1 created: 2026-02-28 author: "Wikipedia contributors" status: active scope: public tags: ["musculoskeletal-system"] description: "Connective tissue which attaches tendons or ligaments to bones" topic_path: "general/musculoskeletal-system" source: "https://en.wikipedia.org/wiki/Enthesis" license: "CC BY-SA 4.0" wikipedia_page_id: 0 wikipedia_revision_id: 0

::summary Connective tissue which attaches tendons or ligaments to bones ::

::data[format=table title="Infobox anatomy"]

FieldValue
NameEnthesis
ImageJoint.svg
CaptionTypical joint
::

| Name = Enthesis | Latin = | Image = Joint.svg | Caption = Typical joint | Image2 = | Caption2 = | Precursor = | System = | Artery = | Vein = | Nerve = | Lymph =

The enthesis (plural entheses) is the connective tissue which attaches tendons or ligaments to a bone.

There are two types of entheses: fibrous entheses and fibrocartilaginous entheses.

In a fibrous enthesis, the collagenous tendon or ligament directly attaches to the bone.

In a fibrocartilaginous enthesis, the interface presents a gradient that crosses four transition zones:

  1. Tendinous area displaying longitudinally oriented fibroblasts and a parallel arrangement of collagen fibres
  2. Fibrocartilaginous region of variable thickness where the structure of the cells changes to chondrocytes
  3. Abrupt transition from cartilaginous to calcified fibrocartilage—often called 'tidemark' or 'blue line'
  4. Bone

Clinical significance

A disease of the entheses is known as an enthesopathy or enthesitis.

Enthetic degeneration is characteristic of spondyloarthropathy and other pathologies.

The enthesis is the primary site of disease in ankylosing spondylitis.

Society and culture

Bioarchaeology

Entheses are widely recorded in the field of bioarchaeology, in which the presence of anomalies at these sites, called entheseal changes, has been used to infer repetitive loading to study the division of labour in past populations. Several different recording methods have been proposed to record the variety of changes seen at these sites. Previous studies have shown that, whichever recording method is used, certain entheseal changes occur more frequently in older individuals. Moreover, research demonstrates that diseases, such as ankylosing spondylitis and calcific tendinitis, also have to be taken into consideration. Nevertheless, experimental studies relying on virtual anthropological methods of analysis (e.g.,"Validated Entheses-based Reconstruction of Activity" 1.0 and 2.0 ) have demonstrated how loading history (physical activity) can increase the relative three-dimensional (3D) size of muscle attachment sites and their subtle surface changes.

History

"Enthesis" is rooted in the Ancient Greek word, "ἔνθεσις" or "énthesis," meaning "putting in," or "insertion." This refers to the role of the enthesis as the site of attachment of bones with tendons or ligaments. Relatedly, in muscle terminology, the insertion is the site of attachment at the end with predominant movement or action (opposite of the origin). Thus the words (enthesis and insertion [of muscle]) are proximal in the semantic field, but insertion in reference to muscle can refer to any relevant aspect of the site (i.e., the attachment per se, the bone, the tendon, or the entire area), whereas enthesis refers to the attachment per se and to ligamentous attachments as well as tendinous ones.

References

References

  1. "enthesis". [[General Electric.
  2. (2012). "Structural Interfaces and Attachments in Biology". Springer.
  3. (January 2014). "Cellular therapy in bone-tendon interface regeneration". Organogenesis.
  4. (May 2017). "The tendon-to-bone attachment: Unification through disarray". Nature Materials.
  5. (April 2006). "Where tendons and ligaments meet bone: attachment sites ('entheses') in relation to exercise and/or mechanical load". Journal of Anatomy.
  6. (2011-01-01). "A Companion to Paleopathology". Wiley-Blackwell.
  7. (1995-12-01). "Activity-induced musculoskeletal stress markers (MSM) and subsistence strategy changes among ancient Hudson Bay Eskimos". International Journal of Osteoarchaeology.
  8. (2013-03-01). "Recording Specific Entheseal Changes of Fibrocartilaginous Entheses: Initial Tests Using the Coimbra Method". International Journal of Osteoarchaeology.
  9. (2016-09-01). "The New 'Coimbra Method': A Biologically Appropriate Method for Recording Specific Features of Fibrocartilaginous Entheseal Changes". International Journal of Osteoarchaeology.
  10. (June 2004). "Enthesopathies--proposal of a standardized scoring method and applications". Collegium Antropologicum.
  11. (March 2007). "The study of entheses: proposal of a standardised scoring method for twenty-three entheses of the postcranial skeleton". Collegium Antropologicum.
  12. "Practical protocol for scoring the appearance of some fibrocartilaginous entheses on the human skeleton".
  13. (June 2010). "Enthesopathies as occupational stress markers: evidence from the upper limb". American Journal of Physical Anthropology.
  14. (June 2016). "In search of consensus: Terminology for entheseal changes (EC)". International Journal of Paleopathology.
  15. (2016). "Morphometric patterns among the 3D surface areas of human hand entheses". American Journal of Biological Anthropology.
  16. (May 2018). "A repeatable geometric morphometric approach to the analysis of hand entheseal three-dimensional form". American Journal of Physical Anthropology.
  17. (2013-03-01). "The Categorisation of Occupation in Identified Skeletal Collections: A Source of Bias?". International Journal of Osteoarchaeology.
  18. (December 2015). "Evaluating the efficiency of different recording protocols for entheseal changes in regards to expressing activity patterns using archival data and cross-sectional geometric properties". American Journal of Physical Anthropology.
  19. (July 2012). "The effect of age, sex, and physical activity on entheseal morphology in a contemporary Italian skeletal collection". American Journal of Physical Anthropology.
  20. (2017-06-20). "The new Coimbra method for recording entheseal changes and the effect of age-at-death". BMSAP.
  21. (March 2013). "Do diseases cause entheseal changes at fibrous entheses?". International Journal of Paleopathology.
  22. Karakostis, Fotios Alexandros. (2025-04-16). "Introducing "Validated entheses-Based reconstruction of activity 2.0" (VERA 2.0): Semi-automated 3D analysis of bone surface changes". PLOS ONE.
  23. Karakostis, Fotios Alexandros. (May 2023). "Statistical protocol for analyzing 3D muscle attachment sites based on the "Validated Entheses-based Reconstruction of Activity" (VERA) approach". International Journal of Osteoarchaeology.
  24. (November 2019). "Experimental proof that multivariate patterns among muscle attachments (entheses) can reflect repetitive muscle use". Scientific Reports.
  25. (December 2019). "Experimental evidence that physical activity affects the multivariate associations among muscle attachments (entheses)". The Journal of Experimental Biology.
  26. (February 2022). "Effects of selective breeding for voluntary exercise, chronic exercise, and their interaction on muscle attachment site morphology in house mice". Journal of Anatomy.
  27. (2023-01-31). "Climbing influences entheseal morphology in the humerus of mice: An experimental application of the VERA methodology". American Journal of Biological Anthropology.

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musculoskeletal-system