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The ball joint is modeled as a sphere attached to a rotating flexible beam and it is in contact with a semi-spherical rigid socket.
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Due to stress shielding, rigid sockets may reduce the acetabular bone quality (Wright et al. 2001, Huo and Osier 2008).
Based on the bending stiffness of socket joints obtained through experiments, the finite element models of single-layer elliptical paraboloid latticed shells with the semi-rigid socket joints are established.
Recently, Zilkens et al. (2011) used "ein bild" radiographic analysis (EBRA) to show that there was no effect when using additional screw fixation in rigid cementless press-fit sockets.
Thinner polyethylene may lead to increased socket rigidity, resulting in greater constraints at the bone-cement interface; indeed, this has been observed with other types of rigid cemented cups (Nich et al. 2003).
The pelvic socket (acetabulum) is substituted with a rigid or soft spherical shell called the acetabular cup (Farag 2013).
Each segment was assumed as a rigid body and linked together by ball and socket joints.
You will need: 1/4 inch socket from a socket set.
To our knowledge, only Thanner et al. (2000) have performed a radiostereometric analysis-based (RSA) randomized controlled trial (RCT); they found no effect of the additional screw fixation in a rigid metal-backed modular titanium-mesh HA- (hydroxyapatite-) coated socket.
It is thought that the titanium shell may act as a shock absorber between the very rigid alumina and the probably porotic bone, solving the problem of socket fixation reported when a bulky alumina cup was cemented into the acetabulum [ 28].
The ball-and-socket joint is an elaborate structure allowing both the rigid connection and flexible movement of neighboring elements.
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