GANSCUP - Laboratory and clinical validation of the Gravity Assisted Navigation System (GANS) for acetabular cup placement

• Research unit: INNOSUISSE
• Project number: 8568.1;4 LSPP-LS

Short description (English)

GANSCUP - Laboratory and clinical validation of the Gravity Assisted Navigation System (GANS) for acetabular cup placement

Short description (French)

GANSCUP - Laboratory and clinical validation of the Gravity Assisted Navigation System (GANS) for acetabular cup placement

Abstract (English)

Acetabular cup orientation is a key factor determining hip stability and range of motion before impingement. Studies using navigation technology have shown that up to 78% of patients operated even by experienced surgeons may end up with cups outside the so called 'safe zone' acc. Lewinneck'. From latest surgical navigation technology only a small proportion of the population are able to benefit primarily due to high system cost. A new, simple to use, cost effective Gravity Assisted Navigation System (GANS), has shown in vitro precision and accuracy comparable to navigation technology (Echeverri et al., The Journal of Arthroplasty 21(3) 2006). However, differences in pelvic morphology, handling, and intraoperative conditions may have an effect on the clinical precision and accuracy of GANS, which has been estimated as small and clinically insignificant. Therefore this three-part feasibility study is proposed composed of: (a) a mathematical analysis to predict the effects of pelvic morphology on the performance of the GANS, (b) 'merging' both technologies a sensitivity study on the precision and accuracy of the device, and (c) a clinical pilot study with comparison to a surgical navigation system as the gold standard.

Abstract (French)

Acetabular cup orientation is a key factor determining hip stability and range of motion before impingement. Studies using navigation technology have shown that up to 78% of patients operated even by experienced surgeons may end up with cups outside the so called 'safe zone' acc. Lewinneck'. From latest surgical navigation technology only a small proportion of the population are able to benefit primarily due to high system cost. A new, simple to use, cost effective Gravity Assisted Navigation System (GANS), has shown in vitro precision and accuracy comparable to navigation technology (Echeverri et al., The Journal of Arthroplasty 21(3) 2006). However, differences in pelvic morphology, handling, and intraoperative conditions may have an effect on the clinical precision and accuracy of GANS, which has been estimated as small and clinically insignificant. Therefore this three-part feasibility study is proposed composed of: (a) a mathematical analysis to predict the effects of pelvic morphology on the performance of the GANS, (b) 'merging' both technologies a sensitivity study on the precision and accuracy of the device, and (c) a clinical pilot study with comparison to a surgical navigation system as the gold standard.