Analysis of volume differences between the sockets and the electronic AAOP files showed that 20 of the 30 sockets had volumes that were within a range of -1.
1 percent volume difference of the electronic AAOP files.
In other words, the sockets were consistently smaller or consistently larger throughout the surface than the electronic AAOP files.
1% of the electronic AAOP files), but a large range in radii differences and a large SD of the mean radial error (Table 3, columns 5-6 and column 8, respectively).
Sockets were smaller than the electronic AAOP files over the crest of the tibia for almost all sockets (except those for Companies 6 and 10), though the degree of error varied considerably by manufacturer.
We compared centrally fabricated socket shapes and electronic AAOP shape files to assess the accuracy of the central fabrication process for 10 selected manufacturers.
25 mm, between the fabricated sockets and the electronic AAOP files.
While the consistent undersizing is problematic, accommodating for it in clinical practice is relatively easy by simply enlarging the overall socket size in the electronic AAOP file before sending it to this manufacturer.
A very precise assessment was conducted of the match between sockets made by central fabrication facilities and the corresponding electronic AAOP files.
Abbreviations: AAOP = American Academy of Orthotists and Prosthetists, CAD/CAM = computer-aided design/computer-aided manufacturing, LDT = linear displacement transducer, NIH = National Institutes of Health, PETG = polyethylene terephthalate glycol, PT = patellar tendon, RVDT = rotary variable differential transducer, SD = standard deviation.