[Screw-in Performance of Threaded Cups.]

[Screw-in Performance of Threaded Cups.] Research Abstract Details 

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[Screw-in Performance of Threaded Cups.] Abstract Text:

INTRODUCTION: For threaded cups, cup diameter, the shape of the threads and the shape of the cup have a major influence on the screw-in performance. The designs of standard implants vary greatly, making it difficult to carry out comparative studies to provide clear-cut results on the effect of individual parameters on the insertion process. MATERIAL AND METHODS: 15 different prototype cups were manufactured for this study. Three sizes, three shapes and five thread designs were tested using artificial bone. Screw-in performance was measured with the slope of insertion torque before and after reaching the seating point, the torque at the seating point, the insertion angle and the change of slopes at the seating point. RESULTS: Modified trapezoid threads have the lowest insertion resistance and the clearest seating point as well as the most distinct change of slope at the seating point. Flat threads show lower insertion resistance and more increased slopes at the seating point than sharp threads. The slope of insertion torque before and at the seating point is higher for sharp threads in comparison to the other threads, the change of slop is however low. Larger cups show a higher insertion resistance. CONCLUSION: Screw-in performance is decisively influenced by the design of the threads. Modified trapezoid threads are the easiest to insert with excellent manual control, thus reducing the risk of intra-operative overturning. Flat threads also have a low screw-in resistance. Sharp threads have an unsatisfactory screw-in performance because the seating point cannot be "felt".

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PUBMED ID PMID:

MEDLINE DATE: 2008 Mar-Apr

[Screw-in Performance of Threaded Cups.] Journal Published:

PUBLICATION TYPE: Journal Article

Journal: Zeitschrift für Orthopädie und Unfallchirurgie

VOLUME: 146

Page Numbers: 185-93

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ISSN: 1864-6697

DAY: 11

MONTH: 04

YEAR: 2008

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LANGUAGE: ger

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Grant and Affiliation Information for [Screw-in Performance of Threaded Cups.]

AFFILIATION: Orthopädische Universitätsklinik und Poliklinik Friedrichsheim, Frankfurt a. M.

Country: Germany

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MEDLINETA: Z Orthop Unfall

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