Muscles that cross the both the hip and knee can affect the mobility

 Muscles that cross the both the hip and knee can affect the mobility of either of the joints. Using approximately 400-500 words, describe how and why maintaining the position of full knee extension limits the ability to maximally flex the hip both actively and passively.  Does maintaining excessive hip flexion limit the ability to accomplish full knee extension?  Consequently, describe how and why maintaining the position of full knee flexion limits the ability to maximally extend the hip both actively and passively.  Does maintaining excessive hip extension limit the ability to accomplish full knee flexion?  Include at least two scholarly references (using APA formatting and style) to guide your answers.