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Cement collar and longitudinal groove : the effects on mechanical stability with aseptic loosening in Müller straight-stem implants

Nowakowski, Andrej M. and Lüem, Martin and Ochsner, Peter E.. (2008) Cement collar and longitudinal groove : the effects on mechanical stability with aseptic loosening in Müller straight-stem implants. Archives of orthopaedic and trauma surgery, Vol. 128, no. 7. pp. 745-750.

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Official URL: http://edoc.unibas.ch/dok/A5841794

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Abstract

The Müller straight-stem prosthesis (GS-77), in contrast to the Müller SL prosthesis (SL-88), is equipped with a cement collar and longitudinal grooves. Comparative observation of these prostheses suggests that cement collars protect against rapid subsidence and that longitudinal grooves prevent premature formation of a varus tilting deformity.; Because loosening is often observed in the titanium-alloy models of these implants, this retrospective study focused on these models. Differences based on other parameters known to affect mechanical performance were minimized by careful selection: the use of lateralizing implants, patient population characteristics (gender distribution, age, BMI, activity level), and consistency of prosthetic size (10). The comparability of the bending stiffness of both implants in corresponding sizes was verified using finite element method calculations.; Up to the time of revision, 17 GS-77 and 33 SL-88 implants were compared for the amounts of subsidence and prosthetic tilting. Standardized follow-up films were contrasted and radiographically measured. At the time of revision, the GS-77 implants showed subsidence of 4.8 (+/-3.7) mm and the SL-88 implants 8.2 (+/-5.1) mm (p = 0.012). Leaving apart 3 cases with an extreme situation tilting of the GS-77 implants, with 1.2 (+/-0.9) degrees , averaged only two-thirds that of the SL-88 implants, with 1.9 (+/-1.1(p = 0.032). These results support the hypothesis that the cement collar of the Müller straight-stem prosthesis protects against rapid subsidence occurring with aseptic loosening of the implant. The longitudinal grooves appear to counter the development of varus tilting.
Faculties and Departments:03 Faculty of Medicine > Bereich Operative Fächer (Klinik) > Ehemalige Einheiten Operative Fächer (Klinik) > Orthopädie (Valderrabano)
03 Faculty of Medicine > Departement Klinische Forschung > Bereich Operative Fächer (Klinik) > Ehemalige Einheiten Operative Fächer (Klinik) > Orthopädie (Valderrabano)
UniBasel Contributors:Nowakowski, Andrej Maria and Ochsner, Peter
Item Type:Article, refereed
Article Subtype:Research Article
Bibsysno:Link to catalogue
Publisher:Springer
ISSN:0344-8444
Note:Publication type according to Uni Basel Research Database: Journal article
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Last Modified:23 May 2014 08:33
Deposited On:23 May 2014 08:33

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