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Review Question - QID 6407

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QID 6407 (Type "6407" in App Search)
An 8-year-old boy sustains a 100% displaced extension-type supracondylar humerus fracture. Examination reveals no sensory deficit. Capillary refill is approximately 1 second. The patient is unable to flex the index distal interphalangeal joint and the thumb interphalangeal joint. The remainder of the motor examination is normal. Which of the following best explains these physical findings?