A Clinical Evaluation of Metal Ion Release From Metal-on-Metal Cementless Total Hip Arthroplasty

2014-07-23 21:20:14 | BioPortfolio


A clinical Evaluation to determine metal ion release from 4th generation metal-on-metal hip articulating surfaces in cementless total hip arthroplasty.


This evaluation is being conducted to investigate the extent of metal ion release and its incorporation into the surrounding tissue resulting from metal on metal articulating surfaces in cementless total hip arthroplasty.

The amount of metallic ions released post operatively will be assessed by the concentration of Cobalt, Chromium and Molybdenum present in urine and analysed by I.C.P.M.S. (Inductive Coupled Plasma Mass Spectroscopy). The amounts of metallic ions released will be related to the hip function and range of motion measured pre-operatively and post-operatively. Secondary performance of the metal-on-metal articulation will be determined by radiographic evaluation and incidence of complications / revision rates.

Study Design

Endpoint Classification: Safety Study, Intervention Model: Single Group Assignment, Masking: Open Label, Primary Purpose: Treatment




metal on metal hip arthroplasty


Avon Orthopaedic Centre
United Kingdom




Biomet, Inc.

Results (where available)

View Results


Published on BioPortfolio: 2014-07-23T21:20:14-0400

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Medical and Biotech [MESH] Definitions

Neutral or negatively charged ligands bonded to metal cations or neutral atoms. The number of ligand atoms to which the metal center is directly bonded is the metal cation's coordination number, and this number is always greater than the regular valence or oxidation number of the metal. A coordination complex can be negative, neutral, or positively charged.

Proteases which use a metal, normally ZINC, in the catalytic mechanism. This group of enzymes is inactivated by metal CHELATORS.

The technique of washing tissue specimens with a concentrated solution of a heavy metal salt and letting it dry. The specimen will be covered with a very thin layer of the metal salt, being excluded in areas where an adsorbed macromolecule is present. The macromolecules allow electrons from the beam of an electron microscope to pass much more readily than the heavy metal; thus, a reversed or negative image of the molecule is created.

A family of soluble metal binding proteins that are involved in the intracellular transport of specific metal ions and their transfer to the appropriate metalloprotein precursor.

Types of prosthetic joints in which both wear surfaces of the joint coupling are metallic.

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