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. Author manuscript; available in PMC: 2009 Dec 8.
Published in final edited form as: J Orthop Res. 2009 Mar;27(3):340–346. doi: 10.1002/jor.20777

Table 3.

Micro-crack data for the cement and bone. Mean and standard deviation values (in parentheses) are shown for 19 cement-bone fatigue specimens. The Bonferroni corrected p-values are for paired t-tests of length sums between cement and bone.

Pre-existing
cracks		 Growth from
pre-existing
cracks		 New Cracks Total Crack
Growth
Crack Number (N) Cement 93 (62) 40 (34)
Bone 11 (16) 5 (4)
Average Length (mm) Cement 0.09 (0.03) 0.07 (0.02)
Bone 0.08 (0.06) 0.09 (0.06)
Length Sum (mm) Cement 9.28 (7.27) 0.59 (2.25) 2.96 (2.55) 3.54 (3.66)
Bone 1.05 (1.72) 0.13 (0.22) 0.43 (0.40) 0.56 (0.56)
Bonferroni Corrected P-value 0.0003 0.399 0.0009 0.0052