The patella is the largest sesamoid bone in the body.Represent 1% of all skeletal injuries, Most common age group 20 to 50 years old. The function of the patella is to increase the mechanical advantage and leverage of the quadriceps tendon, aid in nourishment of the femoral articular surface, and protect the femoral condyles from direct trauma. 1 Mechanism of injury described here is a indirect as secondary to forcible eccentric quadriceps contraction while the knee is in a semiflexed position 2. A 51 yr old man sustained injury to his right knee joint.x ray radiographs were taken and patient was diagnosed to have post traumatic closed comminuted patella fracture of the right knee joint without neurovascular deficit. Patient underwent patella plate osteosynthesis and post–operative period was uneventful. Patient had no complaints following surgery.