A new hip epiphyseal prosthesis: design revision driven by a validated numerical procedure

Saulo Martelli, Fulvia Taddei, Luca Cristofolini, Enrico Schileo, Neil Rushton, Marco Viceconti

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    12 Citations (Scopus)


    An innovative epiphyseal device has been recently proposed claiming an effective bone-prosthesis load transfer and a nearly physiological bone stresses distribution. However preliminary experimental tests showed a 23% weakening of the femoral neck after implantation. Aim of this study was to revise the prosthesis geometry with the goal of enhancing the femoral neck strength after implantation, while maintaining unchanged the initial conceptual design. To this aim, the risk of femoral neck fractures, prosthesis fractures, aseptic loosening and excessive bone resorption were addressed through a validated finite element procedure following a systematic approach. The initial prosthesis geometry was revised to reduce each investigated failure risk below the threshold of acceptance (100%). The new geometry was re-assessed to verify the effectiveness of the revision. The first design was predicted to locally induce high bone strains and cement stresses, which translated in a risk of bone and cement failure exceeding the threshold of acceptance (>100%). The revised design preserved a good stability of the device, contemporary reducing the risk for bone (45%) and cement (60%) failure. If results will be confirmed by statistical and clinical experimentations, current clinical indications for hip epiphyseal devices might be extended.

    Original languageEnglish
    Pages (from-to)1203-1211
    Number of pages9
    JournalMedical Engineering and Physics
    Issue number10
    Publication statusPublished - Dec 2011


    • Epiphyseal hip prostheses
    • Failure risk
    • Femoral head resurfacing
    • Finite element model
    • Hip prosthesis biomechanics
    • In vitro simulation
    • Numerical pre-clinical validation


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