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The upper limb consists of the arm, forearm, wrist, and hand bones. The humerus is the single bone of the upper arm region. Proximally, it has a large, spherical, smooth head that articulates with the glenoid cavity of the scapula to form the glenohumeral or shoulder joint. The margin of the head is the anatomical neck, a residual epiphyseal plate. Laterally it extends to form bony projections called the greater tubercle and the lesser tubercle. Next to the tubercles is the surgical neck, a...
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Is there something new regarding triceps brachii muscle insertion?

Flávia Emi Akamatsu1, José Renato Negrão2, Marcelo Bordalo Rodrigues3

  • 1PhD, Department of Surgery, Laboratory of Medical Research 02 - Division of Human Structural Topography, Faculdade de Medicina, Universidade de São Paulo (FMUSP), Brazil. Intellectual and scientific content of the study, acquisition of data, technical procedures, manuscript writing, final approval.

Acta Cirurgica Brasileira
|November 25, 2020
PubMed
Summary

The triceps brachii muscle tendon (TBMT) has a distinct distal pre-tricipital space at its olecranon insertion. This anatomical finding, confirmed by MRI, is crucial for accurate elbow diagnosis and treatment.

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Area of Science:

  • Anatomy
  • Radiology
  • Orthopedics

Background:

  • The insertion anatomy of the triceps brachii muscle tendon (TBMT) onto the ulna has been debated.
  • Clarifying the TBMT insertion is important for understanding elbow joint mechanics and potential pathologies.

Purpose of the Study:

  • To anatomically describe the triceps brachii muscle tendon insertion on the ulna.
  • To investigate the presence and characteristics of a pre-tricipital space using magnetic resonance imaging (MRI).

Main Methods:

  • Anatomical dissection of 41 elbows to examine the TBMT insertion.
  • Analysis of elbow plastination slices to identify any spaces within the TBMT.
  • Review of MRI scans to visualize and measure the pre-tricipital space.

Main Results:

  • A consistent distal pre-tricipital space was identified on the medial aspect of the TBMT insertion site in all dissected elbows.
  • MRI confirmed the presence and appearance of this space, with measurements showing no significant difference between right and left elbows or between elbow flexion and extension.
  • Measurement variability was low (coefficient of variation <10%), indicating reliability.

Conclusions:

  • The study confirms the existence of a distinct pre-tricipital space at the triceps brachii muscle tendon insertion.
  • Understanding this anatomical space is vital for clinicians to prevent misdiagnosis and avoid unnecessary interventions related to the elbow.