Reference system for implantation of condylar total knee prostheses
First Claim
1. A reference system for the implantation of condylar total knee prostheses, comprising:
- a measuring rod;
at least two attachment arms for attaching said measuring rod laterally to the tibia so that said measuring rod extends parallel to the longitudinal axis of the tibia;
a guide rail on said measuring rod;
an adjustable measuring carriage on said guide rail for displacement longitudinally thereon;
longitudinal scale means for determining the longitudinal position of said measuring carriage relative to said guide rail;
guide rods extending from said measuring carriage;
cutting block means removably mounted on said guide rods for movement in a direction substantially perpendicular to the frontal plane of the knee for positioning said cutting block means in a predetermined fixed position in front of the knee so that said cutting block means functions as a gauge for osteotomies;
an alignment bar mounted on said measuring rod as a continuation of said measuring rod substantially in the direction of the pelvis and having a length sufficient to extend at least to a position adjacent the pelvis; and
an alignment element adjustably mounted on said alignment bar for adjustment in a direction substantially perpendicular to the sagittal plane and relative to a predetermined reference point on the pelvic bone for determining the correct position of the lower leg during the operation.
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0 Petitions
Accused Products
Abstract
A reference system for the implantation of condylar total knee prostheses comprises a measuring rod (1) parallel to the longitudinal axis of the tibia (T) having at least two attachment arms (2) for lateral attachment to the outside of the tibia (T), a guide rail (9) connected to the measuring rod having a measuring scale (10) thereon and an adjustable measuring carriage (11) to which a cutting block (15) for performing the necessary osteotomies is affixed for movement in two directions so that cutting block can be displaced and fixed in such a way that by slots therein, the osteotomy can be carried out at the right place. For determining the position, there is attached to the measuring rod an alignment bar (20) which forms the continuation of the measuring rod toward the pelvis and has a length such that the end reaches to the pelvis. Disposed at the top of the alignment bar is a movable alignment element which can, for setting purposes, be moved along the alignment bar at right angles to the sagittal plane and fixed. By means of a specific point of reference on the pelvic bone, i.e., a screw in the spina iliaca anterior superior, the tibia can be brought into the correct position during the operation.
259 Citations
20 Claims
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1. A reference system for the implantation of condylar total knee prostheses, comprising:
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a measuring rod; at least two attachment arms for attaching said measuring rod laterally to the tibia so that said measuring rod extends parallel to the longitudinal axis of the tibia; a guide rail on said measuring rod; an adjustable measuring carriage on said guide rail for displacement longitudinally thereon; longitudinal scale means for determining the longitudinal position of said measuring carriage relative to said guide rail; guide rods extending from said measuring carriage; cutting block means removably mounted on said guide rods for movement in a direction substantially perpendicular to the frontal plane of the knee for positioning said cutting block means in a predetermined fixed position in front of the knee so that said cutting block means functions as a gauge for osteotomies; an alignment bar mounted on said measuring rod as a continuation of said measuring rod substantially in the direction of the pelvis and having a length sufficient to extend at least to a position adjacent the pelvis; and an alignment element adjustably mounted on said alignment bar for adjustment in a direction substantially perpendicular to the sagittal plane and relative to a predetermined reference point on the pelvic bone for determining the correct position of the lower leg during the operation. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20)
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Specification