Stem trunnion taper junction wear with femoral head of a total modular prosthesis


  • Constantin Tiganesteanu Institute of Solid Mechanics of the Romanian Academy, Bucharest, Romania
  • Liviu Florin Isvoranu Institute of Solid Mechanics of the Romanian Academy, Bucharest, Romania
  • Stefan Alexandru Ilas Institute of Solid Mechanics of the Romanian Academy, Bucharest, Romania


total modular hip prosthesis, fretting wear, fretting fatigue, wear, stem trunnion taper junction


The introduction of modular hip total prostheses has led to notable facilities, as well as micro-movement problems and fretting wear of modular junctions. The wear of the stem trunnion taper junction with the femoral head of the modular total hip prosthesis is a less well-researched or less published. The total ceramic-to-ceramic hip replacement (CoC) has a substantially lower wear rate than the metal-topolyethylene (MoP) joints, as shown in many papers. However, the revision rates of the CoC and MoP are comparable. To try to explain this discrepancy, wear on both bearing surfaces and the taper-trunnion interface of a 36 mm CoC BIOLOX delta, mounted on titanium trunnions (Ti6Al4V) 12/14, was studied. After 5 million cycles, the total average wear of the ceramic joint surfaces was 0.25 mm3, and the titanium trunnion was 0.29 mm3. This metal wear can provide an explanation for the adverse reaction to the metal debris found in contemporary CoC hip joints. Therefore, it is essential to take into account taper-trunnion wear in the pre-clinical testing of artificial hip joints.


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