Trabecular bone is replaced _____. A only after severe skeletal injuries such as complete fractures B less frequently than cartilage is replaced C every three to four years on average D once during the lifetime at the beginning of puberty
| A |
only after severe skeletal injuries such as complete fractures
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| B |
less frequently than cartilage is replaced
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| C |
every three to four years on average
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| D |
once during the lifetime at the beginning of puberty
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Trabecular bone, also called cancellous bone, is porous bone composed of trabeculated bone tissue. It can be found at the ends of long bones like the femur, where the bone is actually not solid but is full of holes connected by thin rods and plates of bone tissue. Trabecular bone transfers mechanical loads from the articular surface to the cortical bone. The hydraulic properties absorb shock. The material properties of the bone compartments differ: trabecular bone has lower calcium content and more water content compared to cortical bone.
Trabecular bone is replaced only after several skeletal injuries such as complete fractures. In cancellous bone remodeling occurs on the surface of trabeculae and lasts about 200 days in normal bone. Remodeling begins as early as three to four weeks after fracture. Hence the option A is correct.
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