ASTM F1223 – Standard Test Method for Determination of Total Knee Replacement Constraint

This test method covers the establishment of a database of total knee replacement (TKR) motion characteristics with the intent of developing guidelines for the assignment of constraint criteria to TKR designs.  This test method covers the means by which a TKR constraint may be quantified according to motion delineated by the inherent articular design as determined under specific loading conditions in an in vitro environment.  Tests deemed applicable to the constraint determination are antero-posterior draw, medio-lateral shear, rotary laxity, valgus-varus rotation, and distraction, as applicable.  Also covered is the identification of geometrical parameters of the contacting surfaces which would influence this motion and the means of reporting the test results.  This test method is not a wear test.

Example of test results are shown below.

ASTM F1223 Graph 1 Update 12-1-15

ASTM F1223 Graph 2 Update 12-1-15

ASTM F1223 Graph 3 Update 12-1-15

Photos of Test