Injury to which growth site can significantly affect subsequent growth and development?

• A. Epiphyseal cartilage plate.
• B. Articular cartilage.
• C. Medullary cavity.
• D. Periosteum.

Answer: (A)

Longitudinal bone growth in children occurs at the epiphyseal cartilage plate, the growth plate. This area is where chondrocytes divide and are gradually replaced by bone, lengthening the bone as the child grows. If the growth plate is injured, this process can be interrupted, potentially causing a shortened limb or angular deformity as growth stops or misaligns in that region. The timing and location of the injury matter, and growth can be left affected until the plate fuses after puberty, at which point further length growth stops.

Injury to the other structures doesn’t have the same impact on future length. Articular cartilage covers joint surfaces and influences joint function rather than bone length. The medullary cavity mainly houses bone marrow and is not responsible for longitudinal growth. The periosteum contributes to bone growth in thickness and to healing, but it is not the site of lengthwise growth like the growth plate.