Knee replacement surgery

Ligament balancing in computer-aided knee replacement surgery

Knee replacement surgeons cannot currently quantitatively predict the optimal trade-off between alignment and soft tissue balancing. This inability in frequent revision procedures mainly performed because of instability, which is primarily attributable to incorrect ligament balancing. Because there is not yet unanimity regarding how to optimally measure or implement soft tissue balance, we provide means to acquire a variety of measurements. The first approach consists of a distraction device to apply separating forces between the tibia and femur, coupled with a computer-assisted surgical navigation system. The second approach is a model which helps surgeons to release the ligament intra-operatively by providing them with information about ligament lengths throughout the range of motion of the knee. The distraction device is currently in an integration process.

References :

- Cinquin P., Marmignon C., Lavallée S., Distracteur de genou, demande de brevet français 03/02413, international PCT/FR2004/050089

- Marmignon C, Lemniei A., Cinquin P., Robotized distraction device for knee replacement surgery, Computer Assisted Radiology and Surgery conference, 18th : 638-643, 2004

Collaborations : Hôpitaux de Grenoble (Dr Julliard, Pr Merloz, Dr Plaweski, Dr Tonetti, Pr Saragaglia) – Neurolab, Canada (Dr Hodgson) – PRAXIM-Medivision

Status : One thesis defended in 2004. On-going evolutions and industrial project.

Contact :

Laboratoire TIMC-IMAG, Domaine de la Merci, 38706 La Tronche Cedex

Grenoble INP
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