Ex Vivo Evaluation of Cementless Acetabular Cup Stability Using Impact Analyses with a Hammer Instrumented with Strain Sensors

Antoine Tijou (1, 2) , Giuseppe Rosi (1, 2) , Philippe Hernigou (3) , Charles-Henri Flouzat-Lachaniette (4) , Guillaume Haiat (1, 2)

1 MSME - Laboratoire de Modélisation et Simulation Multi Echelle
2 MSME - Laboratoire Modélisation et Simulation Multi-Echelle
3 BCR - Biomécanique cellulaire et respiratoire
4 Hôpital Henri Mondor

The acetabular cup (AC) implant stability is determinant for the success of cementless hip arthroplasty. A method based on the analysis of the impact force applied during the press-fit insertion of the AC implant using a hammer instrumented with a force sensor was developed to assess the AC implant stability. The aim of the present study was to investigate the performance of a method using a hammer equipped with strain sensors to retrieve the AC implant stability. Different AC implants were inserted in five bovine samples with different stability conditions leading to 57 configurations. The AC implant was impacted 16 times by the two hammers consecutively. For each impact; an indicator I S (respectively I F) determined by analyzing the time variation of the signal corresponding to the averaged strain (respectively force) obtained with the stress (respectively strain) hammer was calculated. The pull-out force F was measured for each configuration. F was significantly correlated with I S (R 2 = 0.79) and I F (R 2 = 0.80). The present method has the advantage of not modifying the shape of the hammer that can be sterilized easily. This study opens new paths towards the development of a decision support system to assess the AC implant stability.

Mots clés: total hip arthroplasty; implant stability; acetabular cup; impact

Domaines: Acoustique [physics.class-ph]

Antoine Tijou, Giuseppe Rosi, Philippe Hernigou, Charles-Henri Flouzat-Lachaniette, Guillaume Haiat. Ex Vivo Evaluation of Cementless Acetabular Cup Stability Using Impact Analyses with a Hammer Instrumented with Strain Sensors. Sensors, 2017, ⟨10.3390/s18010062⟩. ⟨hal-02387502⟩