Table 2.

Mechanical test and stereology results for cement-bone specimens prepared from post-mortem retrievals and laboratory prepared constructs (previously reported). Compression test results were not performed in the previous laboratory prepared specimens. Test parameters were all significantly lower (p<0.0001) for the post-mortem retrievals as tested using two-sample t-tests. There were 49 post-mortem retrieval specimens and 21 laboratory prepared specimens.

	Post-mortem Retrievals			Laboratory Prepared
Parameter	Mean	Standard Deviation	Range	Mean	Standard Deviation	Range
Interface tensile stiffness (MPa/mm)	16	35	0.01 – 180	208	131	61.7 – 587
Interface compressive stiffness (MPa/mm)	28	58	0.06 – 346	277	158	84 – 630
Compression test stiffness (MPa/mm)	47	61	0.27 – 332
Compression test offset (mm)	0.039	0.045	0 – 0.16
Failure strength (MPa)	0.21	0.32	0 – 1.02	3.0	1.4	1.2 – 6.4
Stereology contact fraction (CF)	0.11	0.17	0 – 0.72	1.6	0.97	0.5 – 4.1
Stereology intersection fraction (IF)	0.72	0.62	0.01 – 3.3	2.7	1.24	1.2 – 6.3
Interface gap thickness (mm)	0.33	0.28	0.024–1.38	0.013	0.023	0 – 0.08