stages of fracture repair
- Created by: KRCcook
- Created on: 15-10-16 16:26
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- (2) Stages of Fracture Healing: Repair Phase
- periosteum cells replicate + transform
- periosteal cells proximal to the fracture gap => chondroblasts => hyaline cartilage
- periosteal cells distal to the fracture gap => osteoblasts => woven bone
- fibroblasts in the granulation tissue => chondroblasts => hyaline cartilage
- two new tissues grow in size until united with their counterparts from other parts of the fracture
- processes happen inheterogenous tissue (fracture callus.)
- fracture gap bridged by hyaline cartilage / woven bone, restors some original strength
- replacement of the hyaline cartilage and woven bone with lamellar bone.
- known as endochondralossification with respect to the hyaline cartilage andbony substitution with respect to the woven bone.
- mineralized matrix penetrated by channels containing a micro vessel and osteoblasts
- lamellar bone is in the form of trabecular bone
- woven bone + cartilage of original fracture callus is replaced by trabecular bone, restors most of bone's original strength.
- lamellar bone is in the form of trabecular bone
- mineralized matrix penetrated by channels containing a micro vessel and osteoblasts
- known as endochondralossification with respect to the hyaline cartilage andbony substitution with respect to the woven bone.
- replacement of the hyaline cartilage and woven bone with lamellar bone.
- fracture gap bridged by hyaline cartilage / woven bone, restors some original strength
- processes happen inheterogenous tissue (fracture callus.)
- two new tissues grow in size until united with their counterparts from other parts of the fracture
- fibroblasts in the granulation tissue => chondroblasts => hyaline cartilage
- periosteal cells distal to the fracture gap => osteoblasts => woven bone
- periosteal cells proximal to the fracture gap => chondroblasts => hyaline cartilage
- periosteum cells replicate + transform
- (3) Stages of Fracture Healing: Remodelling
- substitutes trabecular bone with compact bone
- trabecular bone resorbed by osteoclasts, creates shallow resorption pit "Howship's lacuna"
- osteoblasts deposit compact bone in resorption pit.
- racture callus remodeled into a newshape close to the bone's original shape / strength
- takes 3 to 5 years depending onfactors such as age or general condition
- racture callus remodeled into a newshape close to the bone's original shape / strength
- osteoblasts deposit compact bone in resorption pit.
- trabecular bone resorbed by osteoclasts, creates shallow resorption pit "Howship's lacuna"
- substitutes trabecular bone with compact bone
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