While insurance will only cover crutches, this knee scooter has really enhanced his mobility. It also ensures that he doesn't bang his foot inadvertantly trying to catch himself. You can either rent or buy them at many places.
It also gives him that freedom of wind in his hair as he goes honking out of control down the parking garage ramps
On another note, found some more views of th x-rays...I haden't realized that the bones were also shifted in the "z" axis: