During young and middle age it's absolutely important to do knee exercises. If knee is totally damaged then there is an option of knee replacement which can give a fresh new lease of life.
Watch the full video on this topic by Dr. K. Mukunth.
Dr. K. Mukunth, MBBS, MS(ORTHO), FIA(GER), EXE.HIP.FEL(UK)
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Consultant Orthopedic Surgeon
Kauvery Hospital, Chennai