Hip prosthesis (titanium), with a ceramic head and polyethylene acetabular cup This will guide the need for further investigations if needed. THA prosthetic designs have been evolving since their inception.Ĭontemporary THA techniques have evolved into press-fit femoral and acetabular components.īearing surfaces are the surfaces which articulate in the prosthetic joint. The femoral head and the acetabular liner can be used in different combinations.
Metal-on-metal (MoM): Although falling out of favor, MoM has historically demonstrated better wear properties from its MoP counterpart.Ceramic-on-ceramic (CoC): CoC has the best wear properties of all THA bearing surfaces.Ceramic-on-polyethylene (CoP): becoming an increasingly popular option.Metal-on-polyethylene (MoP): MoP has the longest track record of all bearing surfaces at the lowest cost.These will give different appearance on radiograph depending on the configuration. MoM has lower linear-wear rates and decreased volume of particles generated. However, the potential for pseudotumor development as well as metallosis-based reactions (type-IV delayed hypersensitivity reactions) has resulted in a decline in the use of MoM. MoM is also contraindicated in pregnant women, patients with renal disease, and patients at risk of metal hypersensitivity. įemoral component or stem: this refers to the prosthesis which is implanted into the femur. They can be described by length, taper, and presence of a collar. Attached to the femoral component is the neck and head which in most prostheses can be altered in size to create a stable joint. Prosthesis fixation: Femoral stem fixation can be either cemented or non-cemented (biological) fixation.
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