International Orthopaedics

, Volume 36, Issue 7, pp 1341–1347 | Cite as

Biomechanical reconstruction of the hip: comparison between modular short-stem hip arthroplasty and conventional total hip arthroplasty

  • Florian SchmidutzEmail author
  • Marc Beirer
  • Patrick Weber
  • Farhad Mazoochian
  • Andreas Fottner
  • Volkmar Jansson
Original Paper



Short-stem hip arthroplasty preserves femoral bone stock which includes the femoral neck. This implies that the stem has to follow the anatomy of the femoral neck. Therefore, it has been questioned whether biomechanical reconstruction of the hip can be safely achieved with SHA.


Biomechanical reconstruction of the hip was analysed for 50 modular short-stem hip arthroplasties (SHA) and compared to 50 conventional total hip arthroplasties (THA). Biomechanical parameters were analysed on pre- and postoperative pelvic overviews and compared to those of the contralateral side.


The position of the acetabular cup (vertical and horizontal hip centre of rotation) changed slightly and was comparable for both groups. Horizontal femoral offset increased more in SHA (6.2 mm) than in THA (2.0 mm). Compared to the contralateral side it was significantly greater after SHA (+3.6 mm) but almost balanced after THA (−0.2 mm). Limb length increased with both procedures (8.0 mm SHA, 9.1 mm THA), but showed a significantly greater discrepancy after SHA (3.3 mm) as compared to THA (1.3 mm). According to the different implant designs, the stem-shaft axis showed a wider varus-valgus range for SHA (6.2° varus to 8.8° valgus) than for THA (2.6° varus to 3.3° valgus).


Horizontal femoral offset increased more with modular SHA than with conventional THA, but was within a beneficial range. Restoration of limb length appears more difficult in SHA and has a tendency to prolong limb length, which is probably related to the higher femoral resection level. This should be taken into consideration when considering SHA for a patient as well as during implantation.


Contralateral Side Limb Length Resection Level Postoperative Difference Biomechanical Reconstruction 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.



The first author gratefully thanks Nora Goudsouzian for the careful proofreading of the manuscript.

Conflict of interest

The authors declare that they have no conflict of interest.


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Copyright information

© Springer-Verlag 2012

Authors and Affiliations

  • Florian Schmidutz
    • 1
    Email author
  • Marc Beirer
    • 2
  • Patrick Weber
    • 1
  • Farhad Mazoochian
    • 1
  • Andreas Fottner
    • 1
  • Volkmar Jansson
    • 1
  1. 1.Department of Orthopaedic SurgeryUniversity Hospital of Munich (LMU), Campus GrosshadernMunichGermany
  2. 2.Department of Trauma SurgeryTechnical University of Munich (TUM)MunichGermany

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