Patent ID: 7101377

Claim:
A device for determining optimal dimensions of components of a knee endoprosthesis, including A) an angular element ( 7 ) comprising a first plate ( 9 ) and a second plate ( 10 ), said first plate defining a plate longitudinal axis ( 8 ), said second plate being arranged at a right angle to said first plate and defining a central axis ( 19 ) extending perpendicularly to the first plate ( 9 ); and B) a first caliper ( 16 ) that is releasably fastened on the second plate ( 10 ) in a manner that permits said first caliper to be displaced parallel to the central axis ( 19 ), said first caliper having a bearing surface ( 25 ) extending essentially parallel to the first plate ( 9 ) for resting against a tibial plateau ( 29 ) when a knee joint is bent, C) said first plate ( 9 ) comprising a bottom surface ( 17 ), a top surface ( 18 ), a first end portion ( 12 ) intersecting the plate longitudinal axis ( 8 ), and a second end portion ( 13 ) intersecting the plate longitudinal axis ( 8 ); D) said second plate ( 10 ) comprising a top end portion ( 14 ), a bottom end portion ( 15 ), and a substantially planar inner side ( 23 ) adjoining the second end portion ( 13 ) so that the angular element ( 7 ) may be connected to the femur ( 5 ) in such a way that the inner side ( 23 ) may be brought to rest against a distal end face ( 28 ) of the femur and the first plate ( 9 ) is arranged anteriorly to the femur ( 5 ) with the plate longitudinal axis ( 8 ) extending parallel to a longitudinal axis of the femur ( 5 ); E) a second caliper ( 11 ) having a second bearing surface ( 24 ) extending substantially parallel to the inner side ( 23 ) and designed to rest against the tibial plateau ( 29 ) when the knee joint is straightened, said second bearing surface, with the second end portion ( 13 ), is displaceable parallel to the longitudinal axis ( 8 ) and releasably fastenable on the first plate ( 9 ); F) a first inlay ( 22 ) having a bottom end face ( 27 ) facing the first caliper ( 16 ), said first inlay ( 22 ) being arranged between the bottom end portion ( 15 ) and the first caliper ( 16 ) so as to be displaceable coaxially with the central axis ( 19 ) and releasably fastenable on the second plate ( 10 ), said first caliper ( 16 ) being displaceable relative to the first inlay ( 22 ); and G) a second inlay ( 21 ) having an anterior end face ( 26 ) facing the second caliper ( 11 ), said second inlay ( 21 ) being arranged between the second end portion ( 13 ) and the second caliper ( 11 )so as to be displaceable coaxially to the plate longitudinal axis ( 8 ) and releasably fastenable on the first plate ( 9 ), said second caliper ( 11 ) being displaceable relative to the second inlay ( 21 ).