Abstract:
Rehabilitation is an important branch of biomedical engineering
specializations that is exceedingly related to the healthcare delivery and its
improvement, one of the most important topics of rehabilitation is prosthesis
that is related to resolving the problems of the amputations and artificial
joints. The later has been widespread recently due to the bone diseases and
traumas.
Subsidence, stress shielding, fatigue fracture, stiffness mismatching
and expensive prices are the most common problems with metallic artificial
hip joint, which led to presence of different artificial joints modalities with
different qualities. This research aims to enhance the healthcare by providing
an artificial hip joint that proposes a reasonable solution for these problems,
and that through design a hybrid joint composed of hybrid stem that consist
of core and coat with two different materials CoCrMo and PEEK for each of
them respectively. The CoCrMo core exhibits elevated mechanical properties
and optimal corrosion resistance under friction condition and has an elliptical
geometry that permit handling the maximum load that is applied on the joint.
On the other hand the S-shape PEEK coat provides high flexibility and
osteointegration that makes it able to handle the rest of the load that is
applied on the joint. For the suggested design, special mechanical analysis
tests using finite element analysis methods were carried out then repeated 10
times with gradient of 12.8º in the range of motion angle to check the
efficiency of the proposed design, it was observable that the highest value of
the maximum stress presented in the model analysis was 345.34 MPa, this
means the suggested materials and dimensions provides efficient of 64%.
Finally, the proposed design was printed as 3D prototype to verify the
reasonability of the model dimensions.
