護理師協助一位活動受限的病人從病床移動到椅子上，下列哪項動作展現了正確的身體力學？
A nurse is assisting a client with limited mobility to move from the bed to a chair. Which action by the nurse demonstrates proper body mechanics?
- AFlexing the knees and hips while maintaining a straight back✓ 正解屈膝與髖部，同時保持背部挺直
- BKeeping the feet close together to maintain a narrow base of support雙腳併攏以維持狹窄的支撐基底
- CHolding the client close to the nurse's outstretched arms將病人拉離護理師伸直的手臂
- DTwisting the trunk to pivot the client toward the chair扭轉軀幹以將病人轉向椅子
人體工學（Body mechanics）的核心在於透過正確的姿勢與肌肉運用，降低護理師受傷風險並維持病人安全。正確的身體力學應包含：擴大支撐面（雙腳張開）、降低重心（彎曲膝蓋與髖關節）以及保持脊椎平直。透過膝蓋發力取代背部肌肉，能避免腰椎受力過大。選項A正確運用了這些原則。其餘選項皆會導致重心不穩、扭力過大或增加背部負擔，均屬錯誤的實作方式。
The core of body mechanics is to use correct posture and muscle activation in order to reduce the nurse's risk of injury while keeping the patient safe. Correct body mechanics require widening the base of support (feet apart), lowering the center of gravity (flexing the knees and hips), and maintaining a straight back. Using the knees to generate force, rather than the back muscles, prevents excessive load on the lumbar spine. Option A correctly applies these principles. The remaining options destabilize the center of gravity, generate excessive torque, or increase strain on the back, and are therefore incorrect.