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Dimensional control of knee prosthesis0 pages
Example of SOLEX application - n° 3
Dimensional control of knee prosthesis
Objective
Quickly and accurately to check the geometry
of the pieces making up the prosthesis
femoral piece
femur-tibia
interface
Main components
Solex pneumatic micro-measuring systems
Dedicated air gauge
Advantage
With a suitable air gauge the Solex flowmeter
takes a rapid and accurate angle measurement of
a part.
tibial base
Figure 1 - Complete knee prosthesis
Application
The complete knee prosthesis is made up of three parts:
The femoral part is a metal articular surface fixed to the femur.
The polyethylene femur-tibia interface slides and stabilises the articulation between
femur and tibia.
The tibia base is a metal part fixed into the tibia on which the articulated joint rests.
The geometry of the mechanical parts is the determining element in enabling the patient's
knee prosthesis to provide a normal function and improve quality of life.
The micro-measuring principle is based on taking a direct reading of the fall or rise in
pressure following any variation in a flow of air through an orifice.
An air gauge specific to this application is shown in figure 2. The tibia base angle along with
the inserted depth of the femur-tibia interface are measured, using the measurement
principle shown in figure 3.
www.solex-metrology.com
solex@kep-technologies.com
