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Livia is two weeks status post right total knee arthroplasty. During a supine active straight leg raise, the patient is unable to extend the knee fully. Upon examination, the patient can achieve full knee extension passively. Which of the following is the MOST likely cause of the patient's deficit?  

A. Tightness of the posterior capsule of the knee  

B. Femoral nerve impairment  

C. Popliteus muscle spasm 

D. Restricted inferior patellofemoral mobility

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