Related Experiment Video
Updated: Oct 1, 2026
Individualized Stem-positioning in Calcar-guided Short-stem Total Hip Arthroplasty
Published on: February 27, 2018
Primary stability in cementless femoral stems: custom-made versus conventional femoral prosthesis
Christian Götze1, Wolfram Steens, Volker Vieth
1Department of Orthopaedics, University Hospital of Muenster, Albert-Schweitzer-Str. 33, D-48129 Muenster, Germany. chrgoetze@uni-muenster.de
Objective:
To compare a custom-made femoral stem with a conventional cementless stem for initial stability in human femurs.
Design:
The bone-femoral prosthesis interface motion was measured in vitro using displacement transducers. Combined axial and torsional loads simulating single-leg stance, loading were applied.
Background:
The custom-made prosthesis is a cementless femoral stem fabricated from the patient's CT-reconstruction. To justify its clinical use its design has to be tested regarding his primary stability.
Methods:
Seven pairs of human cadaveric femurs were used for testing the custom-made prosthesis versus a conventional cementless stem. Subsidence, rotation and interface motion were measured with load cycles up to 2000 N.
Results:
The critical interface motion of 150 microm for the cementless prosthesis was not exceed for both types of prosthesis. The custom-made prosthesis enlarged in its metaphyseal part showed a decrease of dynamic micromotions and rotation behavior in the proximal region compared to the Alloclassic prosthesis stem.
Conclusions:
The initial stability of the custom-made femoral stem was comparable to that of a conventional femoral stem.
Relevance:
The data set for initial stability justifies the clinical use of a custom-made femoral stem in primary hip replacement. An individualized stem fit into the endosteal cortical bone decrease micromotion.