Experimental treatment by open reduction and internal fixation with modified tension band combined with external compression device was used for the patella fractures. Early post operative continuous passive motion and early weight bearing exercise was followed. This method was excellent for treatment of the patella fractures and prevention of post operative complications such as limitation of motion and post-traumatic arthritis of the knee joint. This experimental treatment was performed in 5 patients. and the results are as follows :1. Treatment by modified tension band combined with external fixator is useful for any type of the patella fracture. 2. By continuous passive motion and programed post operative rehabilitation, early painless recovery of wide range of motion of the knee joint and early weight bearing became possible. 3. Complications such as pain on motion, post-traumatic arthritis and limitation of motion of the knee joint was not seen. 4. This method is excellent for treatment of the patella fractures, and we are now trying to memodel the external fixator for cosmetic improvement and prevention of pin site problems.