Increased loosening of cemented straight stem prostheses made from titanium alloys. An analysis and comparison with prostheses made of cobalt-chromium-nickel alloy

Citation
Tb. Maurer et al., Increased loosening of cemented straight stem prostheses made from titanium alloys. An analysis and comparison with prostheses made of cobalt-chromium-nickel alloy, INT ORTHOP, 25(2), 2001, pp. 77-80
Citations number
17
Categorie Soggetti
Ortopedics, Rehabilitation & Sport Medicine
Journal title
INTERNATIONAL ORTHOPAEDICS
ISSN journal
03412695 → ACNP
Volume
25
Issue
2
Year of publication
2001
Pages
77 - 80
Database
ISI
SICI code
0341-2695(200104)25:2<77:ILOCSS>2.0.ZU;2-L
Abstract
We studied the rate of aseptic loosening of three different types of femora l sterns in primary total hip replacement. After a median follow-up of 10.2 years 4/147 CoCrNi (SS77) straight stems (type M.E. Muller) were revised. After a median follow-up of 7.7 years 32/239 Ti-6Al-7Nb (SS77) were revised and after a median follow-up of 5.2 years 52/203 SLS Titanium alloy stems were revised. Whereas the first two stems are of identical design (smooth-b lasted, anterior and posterior collar), the SLS stem design is different. S urgical procedure and cementing technique have remained unchanged. There is a significantly higher risk of failure for smaller titanium stem sizes and in males and patients who are physically active. This indicates that the g reater elasticity of the Titanium alloy is one of the factors responsible f or loosening.