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Connective Tissue HKIN 473. Group Members: Amy Chu Jesse Godwin Hale Loofbourrow Scott Apperley Greg Kirk Ken Anderson. Overview. Introduction to Connective Tissue Tendons Ligaments Cartilage Conclusion. Introduction.

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Connective tissue hkin 473

Connective TissueHKIN 473

Group Members:

Amy Chu

Jesse Godwin

Hale Loofbourrow

Scott Apperley

Greg Kirk

Ken Anderson


Overview
Overview

  • Introduction to Connective Tissue

  • Tendons

  • Ligaments

  • Cartilage

  • Conclusion


Introduction
Introduction

  • Connective tissues are situated around the body and play numerous roles

  • Components common to connective tissue

    • Collagen Fibers

      • Most abundant (parallel in arrangement)

      • Stronger than steel

    • Reticular Fibers

      • Criss-cross

    • Elastic Fibers

      • Slightly elastic



Tendons function
Tendons: Function

  • Primary Function

    • Attach muscle to bone thereby transmitting tensile loads from muscle to bone to produce movement.

  • Secondary Function

    • Allows the muscle belly to be at an optimal distance from the joint upon which it acts.


Tendons anatomy
Tendons: Anatomy

  • 86% collagen fibers making them very strong

  • The connective tissue that runs the length of the muscle joins together into a bundle of connective tissue, forming the tendon


Tendons physiology
Tendons: Physiology

  • Biomechanical Properties of Tendons

    • 4 regions of the graph

      • (1) concave or “toe,” region. Results form change in the wavy pattern of relaxed collagen fibers which become straighter as the load progresses. Little force is required to elongate tissue initially.

      • (2) linear region. The fibers straighten out and stiffness of the specimen increases rapidly.


Tendons physiology con t

(3) End of linear relation. When the linear region is surpassed major failure of the fiber bundles occurs. Small force reductions in the curve represent early sequential failure of a few greatly stretched fiber bundles.

(4) Maximum load, expressing the ultimate tensile strength of the tissue. Complete failure of the tissue to resist load.

Tendons: Physiology (con’t)


Tendons injury
Tendons: Injury surpassed major failure of the fiber bundles occurs. Small force reductions in the curve represent early sequential failure of a few greatly stretched fiber bundles.

  • The amount of force that the muscle, which the tendon is attached to, can generate and the cross sectional area of the tendon are the major factors in predicting injury.

  • When subjected to loading that exceeds the physiological range, micro-failure takes place even before the yield point is reached.

  • If muscle contracted, the stress on the tendon can be greatly increased with a rapid eccentric contraction.


Tendons viscoelastic behavior
Tendons: Viscoelastic Behavior surpassed major failure of the fiber bundles occurs. Small force reductions in the curve represent early sequential failure of a few greatly stretched fiber bundles.

  • Display rate-dependent behavior under loading (mechanical properties change with different rates of loading).

  • The linear portion of the stress strain curve becomes steeper with increased loading rates. (ie, there is a higher level of stiffness at higher strain rates)

  • With these higher strain rates, tendons can store more energy, require more force to rupture, and undergo greater elongation.


Tendons adaptations
Tendons: Adaptations surpassed major failure of the fiber bundles occurs. Small force reductions in the curve represent early sequential failure of a few greatly stretched fiber bundles.

  • Factors that affect the mechanical properties of tendon include:

    a) Maturation and Aging

    • directly related to quality and number of collagen cross links

      b) Pregnancy

    • tendons and pubic symphysis

      c) Mobilization and Immobilization

      d) NSAID’s

    • short term administration after injury thought to increase rate of biomechanical restoration of tissue.


Ligaments
Ligaments surpassed major failure of the fiber bundles occurs. Small force reductions in the curve represent early sequential failure of a few greatly stretched fiber bundles.


Ligaments function
Ligaments: Function surpassed major failure of the fiber bundles occurs. Small force reductions in the curve represent early sequential failure of a few greatly stretched fiber bundles.

  • Tough, white, fibrous, slightly elastic tissues

  • Connect bone to bone

  • Supporting and strengthening joints

  • Restrict range of motion to prevent excessive movement that could cause dislocation and spraining


Ligaments anatomy
Ligaments: Anatomy surpassed major failure of the fiber bundles occurs. Small force reductions in the curve represent early sequential failure of a few greatly stretched fiber bundles.

  • Ligaments and tendons are regular dense collagen bundles

    • The collagen fibers are closely packed and arranged in parallel to give higher tensile strength

    • Ligaments are strongest with forces parallel to the fiber arrangement (along axis of the fibers)

  • Highly avascular

    • Heal slowly

  • Very similar to tendons


Ligaments examples
Ligaments: Examples surpassed major failure of the fiber bundles occurs. Small force reductions in the curve represent early sequential failure of a few greatly stretched fiber bundles.


Ligaments sprains
Ligaments: Sprains surpassed major failure of the fiber bundles occurs. Small force reductions in the curve represent early sequential failure of a few greatly stretched fiber bundles.

  • Can be caused by the severe stretching or tearing or a ligament

  • Often caused by twisting or wrenching movement

  • Symptoms: pain, swelling, and sometimes bruising

  • Treatment: immediate cold compress and elevation, long term bandaging and/or splinting

    • In rare cases, surgery my be a useful alternative

  • Full recovery may take up to 5 weeks


Cartilage
Cartilage surpassed major failure of the fiber bundles occurs. Small force reductions in the curve represent early sequential failure of a few greatly stretched fiber bundles.


Cartilage anatomy
Cartilage: Anatomy surpassed major failure of the fiber bundles occurs. Small force reductions in the curve represent early sequential failure of a few greatly stretched fiber bundles.

  • Dense network of collagen and elastin fibers

  • Fibers are embedded in a ground substance of chrondroitin sulfate

  • Collagen provides strength

  • Elastin provides elasticity

  • Cartilage is an avascular tissue


Cartilage types
Cartilage: Types surpassed major failure of the fiber bundles occurs. Small force reductions in the curve represent early sequential failure of a few greatly stretched fiber bundles.

  • Three primary types based on proportion of chondrocytes, elastin fibers and collagen fibers

    1. Fibrocartilage

    2. Elastic Cartilage

    3. Hyaline Cartilage


1 firbrocartilage
1. Firbrocartilage surpassed major failure of the fiber bundles occurs. Small force reductions in the curve represent early sequential failure of a few greatly stretched fiber bundles.

  • Large proportion of collagen fibers

  • Provides strength and support

  • Found in the pubic symphysis, intervertebral discs, menisci of the knee

Source: Polychondritis Educational Society, Ltd


2 elastic cartilage
2. Elastic Cartilage surpassed major failure of the fiber bundles occurs. Small force reductions in the curve represent early sequential failure of a few greatly stretched fiber bundles.

  • Chondrocytes reside in a “threadlike network” provided by elastic fibers

  • Provides strength and elasticity while maintaining shape

  • Found in the epiglottis and external ear

Source: Polychondritis Educational Society, Ltd


3 hyaline cartilage
3. Hyaline Cartilage surpassed major failure of the fiber bundles occurs. Small force reductions in the curve represent early sequential failure of a few greatly stretched fiber bundles.

  • Most abundant cartilage composed of fine collagen fibres with many chondrocytes

  • Provides flexibility and support

  • Found in the nose, larynx, bronchi, trachea and on the anterior ends of ribs

Source: Polychondritis Educational Society, Ltd


Cartilage endochondral ossification
Cartilage: Endochondral Ossification surpassed major failure of the fiber bundles occurs. Small force reductions in the curve represent early sequential failure of a few greatly stretched fiber bundles.

  • A further function of Hyaline Cartilage is in the formation of long bones

  • Starting in the fetus, cartilage calcifies until full bone growth has been achieved, typically at the age of 25

Tortora & Grabowski, 2000


Articular cartilage
Articular Cartilage surpassed major failure of the fiber bundles occurs. Small force reductions in the curve represent early sequential failure of a few greatly stretched fiber bundles.

  • Hyaline or Fibrocartilage found in joints on the articulating surfaces of bones

  • Provides a smooth, slippery surface that reduces friction and absorbs shock in joints

Tortora & Grabowski, 2000


Cartilage osteoarthritis
Cartilage: Osteoarthritis surpassed major failure of the fiber bundles occurs. Small force reductions in the curve represent early sequential failure of a few greatly stretched fiber bundles.

  • Painful condition in which the articular cartilage between bones degenerates

  • 11% of people older than 64 years old experience symptoms of osteoarthritis

  • Glucosamine and chondroitin sulfate have been found to relieve some pain symptoms


Cartilage knee menisci
Cartilage: Knee Menisci surpassed major failure of the fiber bundles occurs. Small force reductions in the curve represent early sequential failure of a few greatly stretched fiber bundles.

  • The medial and lateral menisci are wedge-like cushions of fibrocartilage found in the knee joint between the tibia and femur

  • Knee menisci provide stability, support in carrying weight and allow movement in many directions

American Academy of Orthopaedic Surgeons, 2001


Cartilage meniscal tears
Cartilage: Meniscal Tears surpassed major failure of the fiber bundles occurs. Small force reductions in the curve represent early sequential failure of a few greatly stretched fiber bundles.

  • Damage to the menisci can occur in decelerating, twisting, cutting or pivoting

  • Meniscal tears may cause loss of range of motion, pain, stiffness and knee locking

  • Meniscal injuries are hard to heal because of the absence of blood supply

  • Meniscal injuries may require surgical treatment


Thank you
Thank You surpassed major failure of the fiber bundles occurs. Small force reductions in the curve represent early sequential failure of a few greatly stretched fiber bundles.


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