Jm. Hollis, A 6-DEGREE-OF-FREEDOM TEST SYSTEM FOR THE STUDY OF JOINT MECHANICS AND LIGAMENT FORCES, Journal of biomechanical engineering, 117(4), 1995, pp. 383-389
A joint testing system was designed to transmit a specified motion or
force to a joint in all six degrees of freedom (d.o.f.) using a spatia
l linkage system for position feedback. The precise reproducibility of
position provided by this method of position feedback allows determin
ation of in situ ligament forces for external joint loadings. Load on
the structure of interest is calculated from sir d.o.f. load cell outp
ut after the loaded position is reproduced with all other structures r
emoved. In a test of this system, measured lends showed good agreement
with applied lends.