Dr Sushil Kulkarni is A Reliable and Best Knee Replacement Surgeon in PCMC and Best Knee Replacement Surgeon in PUNE. It wouldn’t be wrong if we assume our mobility is strongly based on our lower limbs. Knee also provides better stability and strength to our skeletal structure. It is formed where the femur (thigh bone) meets the tibia (leg bone) and the patella (knee cap). The bones are encased in a fibrous sheath called the capsule. The ends of the femur and tibia and the under surface of the patella are covered with a smooth glistening white tissue called the articular cartilage which provides a low friction surface for movement.