There are two groups of muscles at the knee. The four quadriceps muscles on the front of the thigh work to straighten the knee from a bent position. The hamstring muscles, which run along the back of the thigh from the hip to just below the knee, help to bend the knee.
Source: NIAMS (NIH)1
Read about these related anatomy topics:
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- Source: NIAMS (NIH): niams.nih.gov/ Health_Info/ Knee_Problems/ default.asp
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