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Z Orthop Unfall. 2015 Feb;153(1):46-50. doi: 10.1055/s-0034-1396230. Epub 2015 Feb 27.

[Anatomic reconstruction of hip joint biomechanics: conventional vs. short-stem prosthesis].

[Article in German]

Author information

1
Klinik und Poliklinik für Orthopädie und Unfallchirurgie, Universität zu Köln.
2
Arcus Kliniken Pforzheim.
3
Labor für Biomechanik, Klinik und Poliklinik für Orthopädie und Orthopädische Chirurgie, Justus-Liebig-Universität Gießen.
4
Zentrum für Orthopädie, Unfallchirurgie und Sportmedizin, Orthopädie Kurpfalz, Speyer-Mannheim-Heidelberg.

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.

PMID:
25723580
DOI:
10.1055/s-0034-1396230
[Indexed for MEDLINE]

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