Die anatomische Rekonstruktion des Hüftgelenks: ein Vergleich von Kurz- und Standardschaft
Abstract
BACKGROUND: Currently, short cementless femoral stems are alternative implants to treat osteoarthritis in young patients with sufficient bone quality in order to get a more proximal load transfer. The purpose of the present study was to biomechanically compare joint reconstructions resulting from implantations of a short-stemmed and a conventional hip replacement.
METHODS: 100 patients (50 short-stemmed and 50 conventional) were retrospectively examined. For evaluation of biomechanical parameters standardised pre- and postoperative X-rays (pelvic AP views) were used and digitally analysed.
RESULTS: The horizontal femoral off-set increased within both groups (short: 2.0 mm and conventional: 3.3 mm), with a significant increase in the conventional group. The hip centre of rotation was significantly medialised after both procedures (short: 6.0 mm and conventional: 4.2 mm). Limb length was shorter preoperatively at the arthroplasty side, but increased thereafter (short: 2.1 mm and conventional: 2.6 mm). Compared to the native contralateral side the limb length was almost equal after THA (short: 0.7 mm and conventional: 0.8 mm).
CONCLUSIONS: Our study shows that an almost anatomic reconstruction of hip joint biomechanics is possible with a short-stemmed prosthesis compared to a conventional stem, regarding limb length, centre of rotation and offset.
Bibliographical data
Translated title of the contribution | Anatomic reconstruction of hip joint biomechanics: conventional vs. short-stem prosthesis |
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Original language | German |
ISSN | 1864-6697 |
DOIs | |
Publication status | Published - 02.2015 |
Externally published | Yes |
PubMed | 25723580 |
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