Surgery – Instruments – Orthopedic instrumentation
Patent
1996-04-23
1998-05-12
Buiz, Michael
Surgery
Instruments
Orthopedic instrumentation
606 86, 606 89, A61B 1715
Patent
active
057498768
DESCRIPTION:
BRIEF SUMMARY
The present invention relates to an apparatus for resection of the condyles of the knee for putting a prosthesis into place, comprising a femoral cutting device of the type including a support element equipped with a lower baseplate able to cooperate, in a bearing manner, with the femoral condyles, a guide for blades for femoral cuts, called anterior cut, beveled anterior cut, beveled posterior cut, posterior cut and distal cut, the guide being fixed to the support element and comprising at least one block which is adjustable in height in relation to said support element, an intramedullary femoral rod for orientation and centering of the device, and means for tracing the anterior cortical portion of the femur, said means being integral with the guide.
The invention also relates to a method for putting such an apparatus into position.
It has a particularly important, although not exclusive, application in the field of knee arthroplasty, the aim of which is to restore the articular function of the knee whose condylar surfaces have been progressively damaged as a result of arthrosis.
It is known that arthroplasty affords good results only if the prostheses are put into place with precision, which necessitates an ancillary preparation apparatus permitting, on the one hand, an exact orientation of the cutting guides in order to reproduce the mechanical alignment of the lower limb being treated, and, on the other hand, a balance between the cuts on the tibial and femoral articular surfaces in order to obtain a good stability over the whole area of the knee joint.
To do this, it is necessary that the prosthesis respect precisely the mechanical axis 1 of the lower limb being treated (see FIG. 1), which axis passes through the center 2 of the femoral head 3, through the center 4 of the knee joint 5, and through the center 6 of the ankle joint 7.
Now, the mechanical axis 1 forms, together with the anatomical axis 8 of the femur 9, an angle of between 3.degree. and 90.degree., depending on the individual, and is in contrast substantially superposed with the anatomical axis 10 of the tibia 11, except in the case of deformation.
The correct orientation of the resecting apparatus, and its positioning in a simple and reliable manner as a function of the different axes, is thus of paramount importance to the practitioner.
A large number of ancillary apparatuses for femoral and/or tibial cutting are already known.
The document FR A 2,679,766 describes, for example, a femoral cutting device which permits a correct positioning of the prosthetic implants in the frontal and sagittal planes.
However, such a device has disadvantages.
This is because it requires several guides for cutting blades of different dimensions in order to adapt to the different joint sizes. This results in the risk of mistakes during the positioning of the guide, this positioning in most cases being preselected by trial and error. Furthermore, a long time is taken in putting the guide into position, and the cost and the size of the components of the device taken as a whole are also considerable.
A resecting apparatus is also known (FR-A-2,664,157) which includes a cutting blade guide in two blocks, namely a first block integral with the support element for the beveled cuts and the posterior cut, and a second block which is adjustable in height in relation to the first one in order to effect the anterior cut.
Here, once again, such an apparatus presents disadvantages associated with its lack of adaptability to the dimensions of the patient's condyles.
The document FR 2,629,339 describes for its part installation equipment for a tibial element, comprising an external guide rod integral with the tibial cutting guide and designed to be fixed temporarily on a portion of the tibia.
Such equipment also has disadvantages. It is not in fact very reliable because it is difficult to control and has a tendency to produce a cut which is not perfectly orthogonal to the anatomical axis of the tibia.
Installation apparatuses for a tibial element are also known which com
REFERENCES:
patent: 4892093 (1990-01-01), Zarnowski et al.
patent: 5474559 (1995-12-01), Bertin et al.
De Roaldes Olivier
Duvillier Eric
Gineston Jean-Marie
Biomicron
Buiz Michael
Ortho Diffusion & Recherche
Reip David O.
LandOfFree
Apparatus for resection of the condyles of the knee for putting does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Apparatus for resection of the condyles of the knee for putting , we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Apparatus for resection of the condyles of the knee for putting will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-975539