1 / 23

Ligaments and Tendons

Ligaments and Tendons. Ligaments. Augment the mechanical stability of joints Guide joint motion Prevent excessive motion. Tendons. Attach muscle to bone Transmit tensile loads from muscle to bone. Composition. Dense connective tissue (parallel-fibers of collagen)

oona
Download Presentation

Ligaments and Tendons

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript

  1. Ligaments and Tendons

  2. Ligaments • Augment the mechanical stability of joints • Guide joint motion • Prevent excessive motion

  3. Tendons • Attach muscle to bone • Transmit tensile loads from muscle to bone

  4. Composition • Dense connective tissue (parallel-fibers of collagen) - Sparsely vascularized • Cellular (fibroblasts) – 20 % • Extracellular (80%) - 70% H2O - 30% solids –collagen, ground substance, elastin

  5. Composition • Collagen - ligaments - 75% of solids - tendons – 75%+ of solids

  6. Ligament/Tendon Schematic

  7. Ligament/Tendon Schematic

  8. Ligament versus Tendon

  9. Tendon - Structure and Function • sustain high tensile forces • flexible

  10. Ligament - Structure and Function • pliant and flexible • strong and inextensible/inelastic

  11. Injury is affected by: • Rate of impact • Amount of load

  12. Load Deformation Tendon 3 4 2 1

  13. ACL Injury

  14. ACL Injury Microfailure Load Physiological Loading Complete Failure Injury Joint Displacement Clinical Test

  15. Load Deformation Ligamentum Flavum

  16. Factors affecting Mechanical Properties • Maturation - 20  # & quality of cross-links  tensile strength and collagen fiber diameter (hypertrophy)

  17. Factors affecting Mechanical Properties • Aging – collagen content  stiffness, strength & ability to withstand deformation • Pregnancy and postpartum – tensile strength & stiffness in tendons 

  18. Factors affecting Mechanical Properties • Physical Training - tendon tensile strength and ligament-bone interface strength - ligaments become stronger and stiffer, collagen fibers increase in diameter

  19. Factors affecting Mechanical Properties • Immobilization -  tensile strength of ligaments, more elongation, less stiff -  in cross-links -After 8 weeks of immobilization  12 months to recover strength & stiffness

  20. Effects of Immobilization

  21. Effects of Immobilization

  22. Exercise Control 100 Recovery (ligament substance) Immobility Recovery (insertion site) Structural/mechanical properties (Experimental/Control x 100) 50 0 0 Weeks Months Time Effects of Immobilization

  23. Factors affecting Mechanical Properties • NSAIDS -  tensile strength possibly due to  cross-linkage • Local Cortisone - alters collagen organization in tendon - random versus parallel

More Related