During fracture healing, the first step is:
Fibrocartilaginous callus formation
Formation of a bony callus
Hematoma formation
Remodeling of bone
The Correct Answer is C
A. Fibrocartilaginous callus formation: Fibrocartilaginous callus formation is an early reparative stage that follows hematoma organization, helping bridge the fracture but does not occur first.
B. Formation of a bony callus: Formation of a bony (ossified) callus occurs after the fibrocartilaginous callus is replaced by woven bone during repair.
C. Hematoma formation: Hematoma formation occurs immediately after the fracture as blood vessels rupture, creating a clot that initiates inflammation and brings cells needed for healing.
D. Remodeling of bone: Remodeling is the final phase in which woven bone is replaced by lamellar bone and the medullary canal is restored; it occurs well after initial healing.
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Naxlex Comprehensive Predictor Exams
Related Questions
Correct Answer is B
Explanation
A. Femur:The femur (especially the femoral neck) is a common site of osteoporotic hip fractures but not the single most frequent site overall.
B. Vertebrae:Vertebral bodies are frequently weakened by osteoporosis and commonly fracture, leading to compression fractures and height loss.
C. Humerus:The proximal humerus can fracture with osteoporosis but is less commonly affected than vertebrae and hip.
D. Tibia:The tibia is a strong weight-bearing bone and is a less typical primary site for osteoporosis-related fragility fractures.
Correct Answer is D
Explanation
A. Iron:Iron is essential for hemoglobin and oxygen transport, not a primary structural bone mineral.
B. Sodium: Sodium is an extracellular electrolyte important for fluid balance and nerve function, not bone hardness.
C. Potassium: Potassium is an intracellular electrolyte important for cell function, not the main bone mineral.
D. Calcium: Calcium (along with phosphate in hydroxyapatite) is the primary mineral that gives bone its hardness and compressive strength.
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