Influence of Assembly Conditions of the Taper Junction of Modular Revision Hip Stems on Connection Strength

Description

In this presentation from the ISTA 2024 conference held in Nashville, key insights were shared regarding the assembly conditions and contamination at the tapered junction of modular revision hip stems and its impact on the connection strength of titanium implants. The speaker began with an overview of the challenging bone situations faced during revision total hip arthroplasty, especially in cases with minimal proximal bone support. They highlighted the adaptability of modern modular implant systems, such as the MLP system, which can be tailored to individual patient needs during surgery.



The aim of the study was to investigate how incorrect assembly and taper contamination affected the strength of the implant connections. A total of 48 neck pieces were analyzed under various conditions, including pristine assemblies and those contaminated by a mixture of bovine blood and porcine bone particles. The study explored the correlation between contamination levels and the necessary number of rotations for tightening locking screws during assembly, confirming that higher contaminations required more rotations to achieve a secure fit.



Results indicated a significant increase in relative motion due to contamination and incomplete assembly, which dramatically affected wear after only one hour of testing. The wear patterns observed were consistent across different contamination scenarios. The study concluded that proper cleaning and assembly of implant components are crucial for ensuring long-term stability and functionality. The findings emphasized the need for surgeons to be vigilant about cleanliness during the assembly of modular implants to enhance their longevity.

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