The polyethylene tibial component to be 
tested was first shipped to the Kelsh 
Division potted with epoxy in an aluminum 
block. Our technicians carefully milled 
each corner of the block to a common base 
of elevation, and drilled 76pm (.003") 
diameter control points on two of these 
surfaces, precisely 88.9mm (3.500") apart. 
SUM tS 2.30002-03. PATIRUR is 3% stats REPONENT OP EPTKTED VALNES IS  -3. 
     
              
      
       
   
   
    
  
  
STRIP RUBBER ! OP 9, 1 = 9701 ] 70 16. ‘conrom INTERVAL IS  3.90-02. 
10 1 
106.2990 81.0999 31.5000 29.0999 76. 37000 78.2908 65.3999 — 67.8998 — 15,7998 — 75,0000 45,0999 
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CC BB ana 99 8900 — 77777 ses 
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BD an 999 8808 7777? 3666660606660 6606660660 
a 9 ea 1177 6666 66666666 
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3 96.2000 93.0000 20.7000 63.2998 22. 000 00 22.0999 65,0998 25.3999 
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82.1000 00.2000 39.1000 6.0000 87.7000 80.7000 95.7000 3.8000 36.6090. 84.1000 
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15 42.7000 70.5000 11.5000 — 65.7000 33.1000 13.7000 etn 17 .3000 28.9000 PII ap sets 
3 22222222 14419 2 
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16 79. 2. 20.7000 92.3999 57.8999 39.2000 34.9000 39,0220 56.5999 8 — 31.0999 
oar orm TOOK 0.27 SECONDS, 
Figure 3 — The original computer plot from 
the M.I.T. "CONTUR" program of one poly- 
ethylene socket. 
The Kelsh K-460 Universal Stereometric 
Camera was used to obtain the metric 
photographs. The K-460 is shown in Figure 
4, and was adapted for convergent photogra- 
phy at a 237mm focusing distance as shown 
in Figure 5. A 35mm slide projector beam 
was directed between the camera heads. A 
glass slide with a textured pattern was 
placed in the projector, and a first surface 
mirror was mounted between the camera 
heads to direct the textured pattern down 
on the tibial component. Because of the 
reflective nature of the surface of the 
37 
  
Figure 4 — The Kelsh K-460 Universal 
Stereometric Camera. 
FIRST SURFACE 
MIRROR @ 45° 
P.D.= 145mm 
FOCUS=237mm 
=~ 
-—— 
I0° CONVERGENT 
(TYP) 
=i 
  
  
X / Tom LENS 
237mm EXTENSION 
FOCUS V / ~TIBIAL SPACERS 
COMPONENT 
ALUMINUM BLOCK 
  
  
  
  
  
7777777727777 77747777 97777777 7777777 AZ 
Figure 5 — The Kelsh K-460 was adapted for 
a 237mm focusing distance and 10? convergent 
photography to capture the tibial prosthesis.