Zones: reserve (resting), proliferative, hypertrophic (maturation, degeneration, provisional calcification). Regulation: Ihh/PTHrP feedback loop, GH/IGF‑1 axis, local factors (TGF‑β, BMPs, FGFs, Wnt). Hypertrophic zone is weakest → site of Salter‑Harris fractures. Vascular invasion and endochondral ossification occur at metaphyseal side. Clinical: growth arrest, bar formation, angular deformity after physeal injury; SCFE affects hypertrophic zone. Imaging: physeal widening (rickets), metaphyseal lines (growth arrest lines).
Which zone of the epiphyseal growth plate is primarily responsible for the proliferation of chondrocytes?
What is the primary clinical significance of the hypertrophic zone of the growth plate?
In the regulation of the epiphyseal growth plate, which factor is primarily responsible for stimulating chondrocyte proliferation in the proliferative zone?
Which clinical condition is most directly associated with abnormal signaling in the hypertrophic zone of the growth plate?
What is the primary role of the Ihh/PTHrP feedback loop in the growth plate?
Which of the following factors is NOT known to affect the growth plate?
What imaging finding is commonly associated with growth arrest in the growth plate?
Which zone of the growth plate is considered the 'resting' zone and serves as a reservoir for future growth?
What is the most significant consequence of a Salter-Harris Type V fracture?
Which growth plate zone is primarily involved in the process of calcification?
