Section 20: Fracture Mechanics and Healing 20-1
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1 Section 20: Fracture Mechanics and Healing 20-1
2 20-2 From: Al-Tayyar
3 Basic Biomechanics Bending Axial Loading Tension Compression Torsion Bending Compression Torsion 20-3 From: Le
4 Fracture Mechanics Figure from: Browner et al: Skeletal Trauma 2nd Ed, Saunders, From: Le
5 20-5 From: Al-Tayyar
6 Fracture Mechanics Bending load: Compression strength greater than tensile strength Fails in tension Figure from: Tencer. Biomechanics in Orthopaedic Trauma, Lippincott, From: Le
7 Fracture Mechanics Combined bending & axial load Oblique fracture Butterfly fragment Figure from: Tencer. Biomechanics in Orthopaedic Trauma, Lippincott, From: Le
8 20-8 From: Vanwanseele
9 Bone Healing Direct Primary bone healing Cutting cones Seen with absolute stability Indirect Secondary bone healing Callus formation; resorption at fx site; Seen with relative stability 20-9 From: Justice
10 Inflammation 1-7 days Soft callus 3 weeks Hard callus 3 4 months Remodeling months => years Indirect Stages: From: Justice
11 Relative Stability Motion between fracture fragments that is compatible with fracture healing. Motion is below the critical strain level of tissue repair. Promotes indirect bone healing! Examples: IM nails Bridge plate External Fixator From: Justice
12 Absolute Stability Compression of two anatomically reduced fracture fragments. No displacement of the fracture under functional load. Promotes direct bone healing! Examples: Lag screw Plate => compression, buttress, neutralization Tension band From: Justice
13 Bone Development and Healing The process of bone development is called ossification. There are two types of ossification: endochronal and intramembranous. Bone healing occurs in stages: fracture, granulation, callus, lamellar ll bone, and normal contour From: Ames Chapter 5 The Skeletal System
14 Fracture Repair Step 1: A. Immediately after the fracture, extensive bleeding occurs. Over a period of several hours, a large blood clot, or fracture hematoma, develops. B. Bone cells at the site become deprived of nutrients and die. The site becomes swollen, painful, and inflamed. become deprived of Step 2: Step 2: A. Granulation tissue is formed as the hematoma is infiltrated by capillaries and macrophages, which begin to clean up the debris. B. Some fibroblasts produce collagen fibers that span the break, while others differentiate into chondroblasts and begin secreting cartilage matrix. C. Osteoblasts begin forming spongy bone. D. This entire structure is known as a fibrocartilaginous callus and it splints the broken bone From: Imholtz
15 Fracture Repair Step 3: A. Bone trabeculae increase in number and convert the fibrocartilaginous callus into a bony callus of spongy bone. Typically takes about 6-8 weeks for this to occur. Step 4: A. During the next several months, the bony callus is continually remodeled. B. Osteoclasts work to remove the temporary supportive structures while osteoblasts rebuild the compact bone and reconstruct the bone so it returns to its original shape/structure From: Imholtz
16 Biomechanics Intact/Healing Bone Hierarchical structure Collagen embedded with apatite Decreased modulus with decreased apatite:collagen ratio Fibrils organized to resist force Fibers organized into lamellae Concentric Lemellae make an Osteon From: Justice
17 Strength/Stiffness Strength proportional p to density 2 Modulus proportional to density (2 to 3) Age: increased modulus, bending strength from child to adult, then decrease Holes/defects weaken bone (round better than square) Strength proportional to diameter From: Justice
18 Fracture Mechanics Fracture Callus Moment of inertia proportional to r 4 Increase in radius by callus greatly increases moment of inertia and stiffness x stronger Figure from: Browner et al, Skeletal Trauma nd Ed, Saunders, From: Le x weaker Figure from: Tencer et al: Biomechanics in Orthopaedic Trauma, Lippincott, 1994.
19 Fracture Mechanics Time of Healing Callus increases with time Stiffness increases with time Near normal stiffness at 27 days Does not Figure from: Browner et al, Skeletal Trauma, correspond to 2nd Ed, Saunders, radiographs From: Le
20 Remodeling of Bone Wolff s Law Remodeling balance between bone absorption of osteoclasts and bone formation by osteoblasts osteoporosis increase porosity of bone, decrease in density and strength, increase in vulnerability to fractures piezoelectric effect electric potential created when collagen fibers in bone slip relative to one another, facilitates bone growth use of electric and magnetic stimulation to facilitate bone healing From: Brown
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