𝔖 Bobbio Scriptorium
✦   LIBER   ✦

Friction moments of large metal-on-metal hip joint bearings and other modern designs

✍ Scribed by N.E. Bishop; F. Waldow; M.M. Morlock

Publisher
Elsevier Science
Year
2008
Tongue
English
Weight
737 KB
Volume
30
Category
Article
ISSN
1350-4533

No coin nor oath required. For personal study only.

✦ Synopsis

Modern hip joint replacements are designed to minimise wear problems. The most popular metal-on-polyethylene components are being updated by harder metal and ceramic combinations. However, this has also been shown to influence the friction moments, which could overload the interface between the implant and the body. In this study custom test apparatus was used to measure the joint moments in various modern bearings under simulated physiological joint conditions. The largest moments in serum were measured for large diameter metal-metal bearings (<8 Nm for standard bearings), followed by metal-polyethylene, and the lowest moments were for small diameter ceramic-ceramic and ceramic-metal combinations. Water as a lubricant was found to double the moments in comparison with serum. In metal-metal bearings moments were reduced by increasing loading frequency. Swing phase load and a rest period between load cycles had little effect. The moment magnitudes are within the turn-out capacity measured for press-fit cups and might become critical with higher joint loads.

📜 SIMILAR VOLUMES

A meta-analysis of design- and manufactu
A meta-analysis of design- and manufacturing-related parameters influencing the wear behavior of metal-on-metal hip joint replacements
✍ Jan Philippe Kretzer; Jennifer A. Kleinhans; Eike Jakubowitz; Marc Thomsen; Chri 📂 Article 📅 2009 🏛 Elsevier Science 🌐 English ⚖ 142 KB

## Abstract This article aims to clarify the influence of design‐ and manufacturing‐related parameters on wear of metal‐on‐metal (MoM) joint bearings. A database search for publications on wear simulator studies of MoM bearings was performed. The results of published studies were normalized; groups

Effect of bearing size on the long-term
Effect of bearing size on the long-term wear, wear debris, and ion levels of large diameter metal-on-metal hip replacements—An in vitro study
✍ Ian Leslie; Sophie Williams; Chris Brown; Graham Isaac; Zhongmin Jin; Eileen Ing 📂 Article 📅 2008 🏛 John Wiley and Sons 🌐 English ⚖ 394 KB

## Abstract Hip resurfacing arthroplasty has become a popular alternative to conventional hip surgery. Surface replacements with bearing sizes of 55 mm (__n__ = 5) and 39 mm (__n__ = 5) were tested in a hip simulator for 15 million cycles (Mc). Wear debris was isolated from the serum lubricant and