Introduction Wolff's Law bone remodels in response to mechanical stress Piezoelectic charges bone remodels is response to electric charges compression side is electronegative and stimulates osteoblast formation tension side is electropostive and stimulates osteoclasts Hueter-Volkmann Law theory that bone remodels in small packets of cells known as Basic Multicellular Units (BMUs) theory suggest that mechanical forces influence longitudinal growth compressive forces inhibit growth may play role in scoliosis Remodeling Mechanism Cortical bone remodels by osteoclastic tunneling (cutting cone) osteoclastic resorption > layering of osteoblasts > layering of lamellae > cement line laid down osteoclast make up head of cutting cone, followed by capillaries and then osteoblasts which lay down the osteoid to fill the cutting cone sclerostin inhibits osteoblastogenenesis to decrease bone formation cortical bone continues to change over time cortical area decreases as age increases linked to increase fracture risk medullary canal volume increases as age increases Cancellous bone remodels by osteoclastic resorption osteoblastic deposition of layers of lamellae
QUESTIONS 1 of 12 1 2 3 4 5 6 7 8 9 10 11 12 Previous Next Sorry, this question is for PEAK Premium Subscribers only Upgrade to PEAK Sorry, this question is for PEAK Premium Subscribers only Upgrade to PEAK Sorry, this question is for PEAK Premium Subscribers only Upgrade to PEAK Sorry, this question is for PEAK Premium Subscribers only Upgrade to PEAK Sorry, this question is for PEAK Premium Subscribers only Upgrade to PEAK Sorry, this question is for PEAK Premium Subscribers only Upgrade to PEAK Sorry, this question is for PEAK Premium Subscribers only Upgrade to PEAK (OBQ10.16) The femur radiograph of a healthy 25-year-old female is compared to the femur radiograph of a healthy 85-year-old female. Which of the following best describes the 25-year-old's femur? Tested Concept QID: 3104 Type & Select Correct Answer 1 Increased cortical thickness and a smaller medullary canal volume 93% (2065/2222) 2 Decreased cortical thickness and a larger medullary canal volume 2% (52/2222) 3 Equivalent cortical thickness and medullary canal volume 1% (28/2222) 4 Increased cortical thickness and larger medullary canal volume 3% (57/2222) 5 Decreased cortical thickness and a smaller medullary canal volume 0% (10/2222) L 1 Question Complexity C Question Importance Select Answer to see Preferred Response SUBMIT RESPONSE 1 Review tested concept Sorry, this question is for PEAK Premium Subscribers only Upgrade to PEAK Sorry, this question is for PEAK Premium Subscribers only Upgrade to PEAK Sorry, this question is for PEAK Premium Subscribers only Upgrade to PEAK (OBQ04.231) A 25-year-old male sustains a transverse humeral shaft fracture and undergoes open reduction and internal fixation with rigid compression plating. What kind of bone healing would be expected with this type of fracture fixation? Tested Concept QID: 1336 Type & Select Correct Answer 1 Primary bone healing through haversian remodeling 93% (1940/2081) 2 Secondary healing through callus formation 1% (28/2081) 3 Primary healing through callus formation 2% (40/2081) 4 Endochondral ossification 2% (38/2081) 5 Secondary healing through osteonal cutting cones 1% (28/2081) L 1 Question Complexity C Question Importance Select Answer to see Preferred Response SUBMIT RESPONSE 1 Review tested concept
All Videos (0) Podcasts (1) Basic Science⎪Bone Remodeling Team Orthobullets (5) Basic Science - Bone Remodeling Listen Now 18:57 min 10/16/2019 128 plays (1)
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