Thank you for asking the query. Your father's knees are very worn out. He has arthritis in both knees with one of them.worse than the other. It is quite.obvious from the x-rays that this is causing the change in appearance of his legs as well. A knee replacement is the only thing that will help him and also help his mobility. Without the joint replacement he is unlikely to be able to walk or lead a painfree life. Choose a good center offering knee replacements with good physiotherapy services as well. This will help in his overall recovery. Hope this helps. Dr Vinu Raj Consultant Orthopaedic Surgeon MBBS MRCS FRCS(Trauma&Orth)