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#knee joint #bending knee #patella function #leg anatomy #joint angle #knee bend

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#hamstring muscle #back of thigh #leg anatomy #posterior thigh muscles #leg muscle group

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#patella shape #knee bone #round bone #leg anatomy

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#quadriceps muscle #upper leg area #thigh muscle #leg anatomy #muscle group #quad location

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#patella #kneecap #knee bone location #pointing to kneecap #leg anatomy