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An 11-year-old boy falls on an outstretched hand and presents with the injury depicted in Figure A. What portion of the physis in Figure B does this injury most commonly occur?
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A 5-year-old boy sustains the fracture shown in Figure A. One year later, a repeat radiograph is taken (Figure B). Injury to the physis occurred through which cellular layer at the time of the initial injury?
Hypertrophic zone, zone of maturation
Hypertrophic zone, zone of degeneration
Hypertrophic zone, zone of provisional calcification
Premature arrest following growth plate injury is attributed to what mechanism?
Proliferation of the perichondrial ring of LaCroix
Initiation of Wolff's law
Disruption of the Heuter-Volkmann principle
Vascular invasion across the physis
An 11-year-old boy sustained an ankle injury while playing football. Figure 20 shows an AP radiograph obtained the day of injury. Treatment should consist of
closed manipulation and a long leg cast.
closed manipulation and a short leg walking cast.
a long leg cast and long-term follow-up to rule out growth arrest.
open reduction and internal fixation with a transphyseal lag screw and a non-weight-bearing cast.
open reduction and internal fixation with fixation parallel to the physis and a non-weight-bearing cast.
Growth at the distal humerus physis accounts for what percentage of humeral length?