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[Anatomy of the labro-capsular complex]

R Putz1, C Schrank

  • 1Anatomische Anstalt, Ludwig-Maximilians-Universität, Lehrstuhl I, München.

Der Orthopade
|December 16, 1998
PubMed
Summary

The acetabular labrum, composed of collagenous fibers, plays a crucial role in hip joint stability. Its unique structure and innervation allow it to exert significant force, aiding in load-dependent joint incongruity.

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Area of Science:

  • Anatomy
  • Biomechanics
  • Orthopedics

Background:

  • The acetabular labrum is a fibrocartilaginous rim crucial for hip joint function.
  • Its detailed structural, vascular, and neural characteristics are essential for understanding hip biomechanics.

Purpose of the Study:

  • To describe the detailed anatomy and structural composition of the acetabular labrum.
  • To elucidate the vascular and neural supply of the acetabular labrum.
  • To highlight the functional significance of the acetabular labrum in hip joint mechanics.

Main Methods:

  • Histological examination of collagenous fiber arrangement.
  • Vascular casting and dissection to identify blood supply pathways.
  • Nerve tracing studies to determine innervation sources.
  • Functional analysis of labral tensional forces.

Main Results:

  • The acetabular labrum consists of circular collagenous fibers attached to the transverse acetabular ligament.
  • It receives significant blood supply from the superior gluteal, obturator, and medial femoral circumflex arteries.
  • Innervation is provided by branches of the nerve to the quadratus femoris and obturator nerve, with abundant mechanoreceptors.
  • The labrum can generate high tensional forces, contributing to hip joint load management.

Conclusions:

  • The acetabular labrum's intricate structure, vascularization, and innervation support its critical role in hip joint stability and function.
  • Its ability to exert tensional force is vital for managing physiological incongruity and loads within the hip joint.

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