A previously healthy 4-year-old boy presented to the emergency department with leg pain and an inability to bear weight on his left side. While jumping on a trampoline with his father at home, he had leaped higher than usual, landed on his feet, and then felt the leg pain. Physical examination was notable for knee swelling and tenderness to palpation on the left side. What is the most likely mechanism of this injury?
一个既往健康的4岁男孩因腿部疼痛且左下肢无法负重至急诊科就诊。在家中与父亲一起玩蹦床时，他跳得比平时高，双脚着地后随即感到腿部疼痛。体格检查显著发现左侧膝关节肿胀及压痛。该损伤最可能的机制是什么？
A. Avulsion of the patellar tendon髌腱撕脱
B. Bending of the bone骨骼弯曲
C. Blunt trauma钝性创伤
D. Compressive axial forces on the bone骨骼轴向受压
E. Twisting around a planted foot固定足部扭转
答案解析：
X光片显示胫骨近端干骺端有一处无移位的骨折，并延伸至生长板。最终诊断为蹦床骨折。儿童蹦床骨折通常表现为横向的胫骨近端骨折，这是由于弹跳时骨骼受到轴向压缩力所致。当较重的人同时跳跃并产生更大的反弹力时，此类损伤的风险会增加。这些骨折若累及生长板，可能会导致肢体生长发育异常。
正确答案：D
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