 Have you ever broken a bone?  Which one?  How long did it take to heal? BELLWORK

11/5/13 FRACTURES AND HEALING

 Fracture = Broken bone  Healing time depends on which bone it is, and severety of fracture BONE FRACTURES

 Open (compound) – broken bone penetrates skin  Closed (simple) – bone does not penetrate skin OPEN VS. CLOSED

 Completely through bone at a right angle to axis of bone  Associated with trauma TRANSVERSE

 Occurs at any other angle than a right angle OBLIQUE FRACTURE

 Spiral fractures are caused by twisting a bone excessively  Common in sports fractures SPIRAL FRACTURE

 Incomplete break to the convex surface of the bend in the bone  Common in children because their bones are more flexible GREENSTICK

 Bone breaks into many fragments  Common in older age due to brittle bones  High impact or crushing injury COMMINUTED

 Broken bone ends are forced into each other  Common in fall injuries when one tries to break their fall with outstretched arms IMPACTED

 Incomplete  Usually caused from repeated stress/pressure to tibia or fibula FISSURE/HAIRLINE

 1. Blood vessels rupture when the bone breaks creating a blood filled swelling called a hematoma.  2. Soft callus forms from some cartilage matrix, bone matrix, and collagen fibers.  3. Osteoblasts (form bone) and osteoclasts (dissolve bone cell) form bony callus.  4. Bony callus is remodeled by osteoclasts. FRACTURE HEALING

 Put the following steps in order and describe what happens at each step.  Bony callus  Remodeling  Soft callus  Hematoma EXIT TICKET