In vitro monitoring of rabbit anterior cruciate ligament damage by acoustic emission.
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Date
2000-06
Authors
Journal Title
Journal ISSN
Volume Title
Publisher
Medical Engineering Physics
Abstract
Anterior cruciate ligament (ACL) rupture is a major clinical problem leading to instability and degeneration of the knee joint.
The problem is compounded by the limited ability of the ACL to heal when ruptured. The existing knowledge regarding the way
the ACL ruptures is limited, and this investigation is an attempt to understand the nature of the ruptures using the rabbit as a model.
A total of 16 rabbit tibia–ACL–femur complexes were stretched in tension to complete rupture. Four specimens were stretched to
failure at a displacement rate of 0.5 mm/min and 12 specimens at 10 mm/min. Acoustic emission (AE) transducers were placed
on both the tibia and the femur, and stress wave signals generated during the tensile test were recorded. Fibre fractures produced
the highest amplitude signals with a relatively longer rise time. Other failure modes such as matrix failure and debonding produced
lower amplitude signals with shorter rise times. We also noted that few events were recorded during the initial period of tensile
loading (the elastic phase). The activity then increased significantly after maximum load was reached. The location information
provided by the acoustic emission system was consistent with the final site of rupture. We have shown that AE can be used to
characterise ligament damage, with fibre pull-outs and fibre fracture producing the highest signal amplitudes.
Description
Published Journal Article
Keywords
Acoustic emission monitoring, Anterior cruciate ligament rupture, Tensile testing, Ligament failure modes
Citation
Azangwe, G. 2000. In vitro monitoring of rabbit anterior cruciate ligament damage by acoustic emission. Medical Engineering Physics, 279-283.