| Autor: |
Andrew, Schoenfeld, Gregory, Vrabec, Suneel, Battula, Ann, Salvator, Glen, Njus |
| Rok vydání: |
2008 |
| Předmět: |
|
| Zdroj: |
American journal of orthopedics (Belle Mead, N.J.). 37(9) |
| ISSN: |
1934-3418 |
| Popis: |
The cortical self-tapping screw (STS) has replaced the non-STS as an aid in fracture fixation. In a recent biomechanical investigation, Berkowitz and colleagues found that STS pullout strength increased with insertion depth up to 1 mm past the far cortex only. In the present study, we wanted to apply a standardized protocol of assessing pullout strength to STSs of different compositions and manufacturers while eliminating the sample-size and block-variance issues that affected the previous investigation. Ninety STSs were randomly divided into 5 groups, each representing a different insertion depth. Peak force was determined with trials ending in screw pullout or failure. A statistically significant difference in pullout strength was identified with insertion depths up to 1 mm past the far cortex. No block variance was detected. These results support the recommendation that STSs be inserted only 1 mm past the far cortex in healthy cortical bone. |
| Databáze: |
OpenAIRE |
| Externí odkaz: |
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