Hi Everyone; as a result of a major RTA in 2005 I have severe difficulties in my right leg and knee. Had several surgeries and rounds of physio over years but no improvement. Have been told too young for replacement but cannot fully flex or kneel on knee and I walk with limp. Anyone got any ideas they can share re exercise possibilities so I don't lose remaining mobility please? I am unstable on many terrains and my knee regularly gives way.