Abstract
Screw fixation can be extremely difficult to achieve in osteoporotic (OP) bone because of its low strength. This study determined how pullout strength is affected by placing different bone screws at varying angles in normal and OP bone models. Pullout tests of screws placed axially, and at angles to the pullout axis (ranging from 10 degrees to 40 degrees), were performed in 0.09 g cm(-3), 0.16 g cm(-3) and 0.32 g cm(-3) polyurethane (PU) foam. Two different titanium alloy bone screws were used to test for any effect of thread type (i.e. cancellous or cortical) on the screw pullout strength. The cancellous screw required a significantly higher pullout force than the cortical screw (p
| Original language | English |
|---|---|
| Pages (from-to) | 822-828 |
| Number of pages | 7 |
| Journal | Medical Engineering & Physics |
| Volume | 32 |
| Issue number | 8 |
| DOIs | |
| Publication status | Published - 1 Oct 2010 |
Keywords
- Pullout strength
- Osteoporosis
- Screw insertion angle
- Bone screws