Silvio Pflugi1, Li Liu2, Timo M Ecker3, Steffen Schumann4, Jennifer Larissa Cullmann5, Klaus Siebenrock6, Guoyan Zheng7. 1. Institute for Surgical Technology and Biomechanics, University of Bern, Bern, Switzerland. silvio.pflugi@istb.unibe.ch. 2. Institute for Surgical Technology and Biomechanics, University of Bern, Bern, Switzerland. li.liu@istb.unibe.ch. 3. Department of Orthopedic Surgery, Inselspital, University of Bern, Bern, Switzerland. TimoMichael.Ecker@insel.ch. 4. Institute for Surgical Technology and Biomechanics, University of Bern, Bern, Switzerland. steffen.schumann@istb.unibe.ch. 5. Department of Radiology, Inselspital, University of Bern, Bern, Switzerland. jennifer.cullmann@insel.ch. 6. Department of Orthopedic Surgery, Inselspital, University of Bern, Bern, Switzerland. klaus.siebenrock@insel.ch. 7. Institute for Surgical Technology and Biomechanics, University of Bern, Bern, Switzerland. guoyan.zheng@istb.unibe.ch.
Abstract
PURPOSE: To evaluate a low-cost, inertial sensor-based surgical navigation solution for periacetabular osteotomy (PAO) surgery without the line-of-sight impediment. METHODS: Two commercial inertial measurement units (IMU, Xsens Technologies, The Netherlands), are attached to a patient's pelvis and to the acetabular fragment, respectively. Registration of the patient with a pre-operatively acquired computer model is done by recording the orientation of the patient's anterior pelvic plane (APP) using one IMU. A custom-designed device is used to record the orientation of the APP in the reference coordinate system of the IMU. After registration, the two sensors are mounted to the patient's pelvis and acetabular fragment, respectively. Once the initial position is recorded, the orientation is measured and displayed on a computer screen. A patient-specific computer model generated from a pre-operatively acquired computed tomography scan is used to visualize the updated orientation of the acetabular fragment. RESULTS: Experiments with plastic bones (eight hip joints) performed in an operating room comparing a previously developed optical navigation system with our inertial-based navigation system showed no statistically significant difference on the measurement of acetabular component reorientation. In all eight hip joints the mean absolute difference was below four degrees. CONCLUSION: Using two commercially available inertial measurement units we show that it is possible to accurately measure the orientation (inclination and anteversion) of the acetabular fragment during PAO surgery and therefore to successfully eliminate the line-of-sight impediment that optical navigation systems have.
PURPOSE: To evaluate a low-cost, inertial sensor-based surgical navigation solution for periacetabular osteotomy (PAO) surgery without the line-of-sight impediment. METHODS: Two commercial inertial measurement units (IMU, Xsens Technologies, The Netherlands), are attached to a patient's pelvis and to the acetabular fragment, respectively. Registration of the patient with a pre-operatively acquired computer model is done by recording the orientation of the patient's anterior pelvic plane (APP) using one IMU. A custom-designed device is used to record the orientation of the APP in the reference coordinate system of the IMU. After registration, the two sensors are mounted to the patient's pelvis and acetabular fragment, respectively. Once the initial position is recorded, the orientation is measured and displayed on a computer screen. A patient-specific computer model generated from a pre-operatively acquired computed tomography scan is used to visualize the updated orientation of the acetabular fragment. RESULTS: Experiments with plastic bones (eight hip joints) performed in an operating room comparing a previously developed optical navigation system with our inertial-based navigation system showed no statistically significant difference on the measurement of acetabular component reorientation. In all eight hip joints the mean absolute difference was below four degrees. CONCLUSION: Using two commercially available inertial measurement units we show that it is possible to accurately measure the orientation (inclination and anteversion) of the acetabular fragment during PAO surgery and therefore to successfully eliminate the line-of-sight impediment that optical navigation systems have.
Entities:
Keywords:
Computer-assisted surgery; Inertial measurement unit; Navigation system; PAO surgery
Authors: Silvio Pflugi; Rakesh Vasireddy; Till Lerch; Timo M Ecker; Moritz Tannast; Nane Boemke; Klaus Siebenrock; Guoyan Zheng Journal: Int J Comput Assist Radiol Surg Date: 2017-11-29 Impact factor: 2.924
Authors: Christoph E Albers; Piet Rogers; Nicholas Wambeek; Sufian S Ahmad; Piers J Yates; Gareth H Prosser Journal: J Hip Preserv Surg Date: 2017-09-14