FEMUR STEM FITTING METHOD FOR MODULE TYPE KNEE PROTHESIS

摘要

PROBLEM TO BE SOLVED: To obtain a wide variety by providing stem configuration parts having a base end part and a tip part and, besides, a fitting nut for fixing the stem configuration parts to femur configuration parts in a knee prothesis. SOLUTION: A collar 14 is fitted to the upper surface part 40B of a boss 40 by positioning its flat surface part at a swelling part 44 by engagement. A stem 12 is engaged with the collar 14 by putting a tip side connector part 27 through a collar hole 34 to permit an engagement surface or a shoulder part 25 to be supported on the stem support surface of the collar 14. The tip part 24 of the stem 12 penetrates a boss hole 47 and a part of the connecter end part 27 is projected inside the boss circular opening part by extension. The fitting nut 20 is inserted to the boss circular opening part from the lower end of a boss structure part 40 and engaged with the tip side connecter part 27 of the stem 12 by screwing. Then, the spherical engagement surface 60 of the fitting nut 20 is joined to an end wall which is formed to be the same shape in the boss circular opening part.