Stress distribution on proximal ulna with implant
Problems associate with total elbow replacement include infection, poor function, pain, fracture, stiffness or instability of joints, loosening or wear of the artificial parts and failure of the triceps tendon. The presence of the abnormal stress could be the factor that resulted in aseptic...
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| Format: | Theses and Dissertations |
| Language: | English |
| Published: |
2014
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| Subjects: | |
| Online Access: | http://hdl.handle.net/10356/61118 |
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| Institution: | Nanyang Technological University |
| Language: | English |
| Summary: | Problems associate with total elbow replacement include infection, poor function,
pain, fracture, stiffness or instability of joints, loosening or wear of the artificial
parts and failure of the triceps tendon. The presence of the abnormal stress
could be the factor that resulted in aseptic loosening.
This project examined the stress distribution between the intact ulna and
implanted ulna. Three different forces, Axial Anteroposterior (AP) compression,
Anteroposterior compression with the magnitude of 1N applied and 1N-cm on the
torsion were applied. These reaction forces are the main responsible for the
loosening of the elbow prosthesis.
From the results obtained, it was found that the stress experienced by the
insertion of the implant has the most impact on the cortical bone as compared to
intact ulna, with an increase of nine-fold when the AP compression force is
applied, followed by the axial compression force which is 2.5 times as high as
compared to the intact model. This could be an indication that leading to the
component loosening. However, the stress is not altered when the torsion is not
applied. |
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