Medicare spends an average of $16,500 to $33,000 per patient for the surgery, hospitalization, and recovery from hip and knee replacements, but depending on the provider and where the treatment takes place, the quality and cost of these surgeries can vary greatly.edicare spends an average of $16,500 to $33,000 per patient for the surgery, hospitalization, and recovery from hip and knee replacements, but depending on the provider and where the treatment takes place, the quality and cost of these surgeries can vary greatly.
Ledge means a piece of masonry or wood or stone that juts out into an open space. A mountain climber might use a ledge of rock to support his body from falling, for example.
slate noun (ROCK) âº [ 1  C or U ] a dark grey rock that can be easily divided into thin pieces, or a small, thin piece of this used to cover a roof. âº [ 2  C ] in the past, a small, thin, rectangular piece of slate (= rock), usually in a wooden frame, used for writing on, especially by children.