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. Author manuscript; available in PMC: 2015 Jul 8.
Published in final edited form as: Acta Orthop Scand. 2003 Jun;74(3):239–247. doi: 10.1080/00016470310014139

Table 2.

Mechanical interfacial shear properties. Mean value (SD)

Treatment Without bone graft With bone graft
Ti HA Ti HA
Primary implants
  Shear strength (MPa) 0.26 (0.21) 2.3 (1.22)1 4.2 (2.3) 3.4 (1.1)
  Shear stiffness (MPa/mm) 0.91 (0.87) 15 (7.23)2 19 (9.4) 19 (2.9)
  Energy to failure (J/m) 0.80 (0.30) 6.8 (1.4)1 13 2.8) 9.9 (1.2)
Revised implants
  Shear strength (MPa) 0.16 (0.07) 0.85 (0.72)3 1.0 (0.9) 3.1 (0.6)5
  Shear stiffness (MPa/mm) 0.43 (0.31) 7.0 (6.7)4 4.1 (3.5) 24 (6.2)6
  Energy to failure (J/m) 0.5 (0.1) 2.6 (0.8)3 3.1 (1.0) 10 (0.6)7
1

Without a bone graft, HA implants differed from Ti implants (p = 0.003)

2

Without a bone graft, HA implants differed from Ti implants (p = 0.001)

3

Without a bone graft, HA implants differed from Ti implants (p = 0.04)

4

Without a bone graft, HA implants differed from Ti implants (p = 0.04)

5

With a bone graft, HA implants differed from Ti implants (p = 0.0003)

6

With a bone graft, HA implants differed from Ti implants (p = 0.00001)

7

With a bone graft, HA implants differed from Ti implants (p = 0.0001)