Traumatic Patellar Fractu...

A 45 year male came to the O.P.D. with complaints of instability and defect in his left knee since 6 months. Patient gave history of trauma due to fall as he was under alcohol influence while walking 6 months back.  On examination, emptiness was present in left knee with intercondylar articulation surface of tibia and femur visible. A swelling was seen in anterior aspect of left distal third thigh, which on palpation was the superior part of the patella. The lower pole of patella was palpable just above the left tibial tuberosity.The radiograph confirmed superior fragment of patella lying in the distal third aspect of thigh and lower fragment close to tibial tuberosity.Suggest a suitable diagnosis and treatment for the same.