Validation of an impact hammer to assess the mechanical properties of a tissue during osteotomy

Léo Lamassoure (1) , Justine Giunta , Giuseppe Rosi (1) , Anne-Sophie Poudrel (1) , Romain Bosc (2) , Guillaume Haiat (1)

1 MSME - Laboratoire Modélisation et Simulation Multi-Echelle
2 IMRB - Institut Mondor de Recherche Biomédicale

Osteotomies are performed with a surgical mallet and an osteotome to cut cartilage and bone tissues in a controlled manner. However, such interventions are difficult and mostly based on the surgeon proprioception. It remains difficult to assess the properties of the bone tissue being osteotomized. A mispositioning of the osteotome or too strong impacts may lead to uncontrolled bone fractures, which may have dramatic consequences. The objective of this study is to determine whether a hammer instrumented with a piezoelectric force sensor (impact hammer) can be used to retrieve information on the mechanical properties of the tissue located around the tip of the osteotome. First, the impact hammer was used to impact 100 samples made of different composite materials and of different thickness values. The signal corresponding to the variation of the force as a function of time was recorded and two indicators were derived for each impact. Support Vector Machines (SVM) learning techniques showed that it was possible to predict the material of a sample impacted by the osteotome with an estimated 89% prediction performance, and to estimate its thickness with an error below 10%. Second, an animal model was used to investigate whether it was possible to detect the apparition of cracks and changes of bone properties during an osteotomy. The same hammer was used to perform osteotomies on rabbit nasal bones and the experiments were filmed to track the progression of the osteotome. The results showed that the arrival of the osteotome at the frontal bone was consistently characterized by a significant change in one of the indicators. Moreover, that same indicator appears to be strongly correlated to the displacement of the osteotome. Based on these results, navigation and decision-support tools could be developed to allow surgeons to adapt their surgical strategy in a patient-specific manner.

Domaines: Acoustique [physics.class-ph]; Vibrations [physics.class-ph]

Léo Lamassoure, Justine Giunta, Giuseppe Rosi, Anne-Sophie Poudrel, Romain Bosc, et al.. Validation of an impact hammer to assess the mechanical properties of a tissue during osteotomy. Forum Acusticum, Dec 2020, Lyon, France. pp.1801-1802, ⟨10.48465/fa.2020.1129⟩. ⟨hal-03235367⟩