Elbow crutch is provided so as to unload the injured Knee and it can only be unloaded if it is taken on the opposite side. It may sound odd, but it is a scientific fact.

I hope, Shahruhkh Khan is attempting this under medical supervision, and not my common man's thinking.

Dr Deepak Goyal
Cartilage, Arthroscopy and Knee Surgery

pic: from Ahmedabad Mirror