|
Year |
2003 |
|---|---|
|
Question Number |
168. |
|
Category |
Musculoskeletal Trauma |
Question
Sterilization by irradiation significantly decreases the structural and mechanical properties of an allograft at what dosage?
1- 1 Mrad
2- 2 Mrad
3- 3 Mrad
4- 4 Mrad
5- 5 Mrad
Figures
Answer (click for answer)
218.
In goat bone patellar bone allografts Gibbons and Butler note that "Based on individual paired contrasts between treatment and control, significant differences were also found in the material properties of the tendon midsubstance. he maximum stress, maximum strain, and streain energy density to maximum stress were significantly reduced following 3 Mrad, but not 2 Mrad of irradiation."
Reference: Buckwalter JA, Einhorn TA, Simon SR (eds): Orthopaedic Basic
Science: Biology and Biomechanics of the Musculoskeletal System.
Rosemont, IL, American Academy of Orthopaedic Surgeons, 2000,
pp 582-616.
Gibbons MJ, Butler DL, Grood ES, et al: Effects of gamma
irradiation on the initial mechanical and material properties of goat
bone-patellar tendon-bone allografts. J Orthop Res 1991;9:209-