Comparison of primary stability of short and standard hip stems: in vitro tests with cyclic loading
- The long-term success of a total hip arthroplasty depends on the correct fixation and stability of the implant. Short stem prostheses allow for more tissue-sparing procedures and a more physiologic loading of the proximal femur compared to standard stem pros-theses. Standard stem prosthesis are more established in clinical practice, but require more extensive bone resection and can lead to stressThe long-term success of a total hip arthroplasty depends on the correct fixation and stability of the implant. Short stem prostheses allow for more tissue-sparing procedures and a more physiologic loading of the proximal femur compared to standard stem pros-theses. Standard stem prosthesis are more established in clinical practice, but require more extensive bone resection and can lead to stress shielding effects (Bieger et al., 2013). The purpose of this study was to evaluate the primary stability of short stem and stand-ard stem under cyclic loading. For this purpose, the differences in per cycle motion and migration of the two prostheses were analyzed. For the test series, six paired femora were implanted either with a short stem prosthesis (optimys, Mathys) or with a standard stem prosthesis (CBC Evolution, Mathys). After specimen preparation, the femora were embedded with a 6 deg dorsal tilt in the sagittal plane and an 8 deg oblique plane and subjected to dynamic loads ranging from 100 N to 1600 N for 30000 cycles (at 2 Hz). Migration and per cycle motion of the stems were an-alyzed using digital image correlation. The total migration of the optimys stem was in average at 428 µm (± 601 µm). The CBC stem had a mean total migration of 1949 µm (± 2135 µm). The standard stem prosthesis therefore migrated further in the femoral canal than the short stem prosthesis. The mean per cycle motion of the optimys stem was about 246 µm (± 113 µm) and about 331 µm (± 171 µm) for the CBC stem. The short stem prosthesis had a lower per cycle motion than the standard stem prosthesis. The results show that the total migration and the per cycle motion of the optimys is lower than of the CBC Evolution. From this it can be concluded that the primary stability of the short stem prosthesis is at least as good as of the standard stem prosthesis.…
Document Type: | Bachelor Thesis |
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Zitierlink: | https://opus.hs-offenburg.de/8643 | Bibliografische Angaben |
Title (English): | Comparison of primary stability of short and standard hip stems: in vitro tests with cyclic loading |
Author: | Kira Kiefer |
Advisor: | Steffen Wolf, Werner Schmölz |
Year of Publication: | 2024 |
Publishing Institution: | Hochschule Offenburg |
Granting Institution: | Hochschule Offenburg |
Contributing Corporation: | Universitätsklinik für Orthopädie und Traumatologie Innsbruck |
Place of publication: | Offenburg |
Publisher: | Hochschule Offenburg |
Page Number: | IX, 49, [13] |
Language: | English | Inhaltliche Informationen |
Institutes: | Fakultät Maschinenbau und Verfahrenstechnik (M+V) |
Collections of the Offenburg University: | Abschlussarbeiten / Bachelor-Studiengänge / BM |
DDC classes: | 600 Technik, Medizin, angewandte Wissenschaften |
GND Keyword: | Endoprothese; Hüftgelenk; Medizintechnik |
Tag: | total hip arthroplasty | Formale Angaben |
Open Access: | Closed |
Licence (German): | Urheberrechtlich geschützt |