Augmented marker tracking for peri-acetabular osteotomy surgery.

Pflugi, Silvio; Vasireddy, Radhakrishna Rakesh; Lerch, Till; Ecker, Timo Michael; Tannast, Moritz; Boemke, Nane; Siebenrock, Klaus-Arno; Zheng, Guoyan (2018). Augmented marker tracking for peri-acetabular osteotomy surgery. International Journal of Computer Assisted Radiology and Surgery, 13(2), pp. 291-304. Springer 10.1007/s11548-017-1690-6

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To develop a hybrid augmented marker-based navigation system for acetabular reorientation during peri-acetabular osteotomy (PAO).


The system consists of a tracking unit attached to the patient's pelvis, augmented marker attached to the acetabular fragment and a host computer to do all the computations and visualization. The augmented marker is comprised of an external planar Aruco marker facing toward the tracking unit and an internal inertial measurement unit (IMU) to measure its orientation. The orientation output from the IMU is sent to the host computer. The tracking unit streams a live video of the augmented marker to the host computer, where the planar marker is detected and its pose is estimated. A Kalman filter-based sensor fusion combines the output from marker tracking and the IMU. We validated the proposed system using a plastic bone study and a cadaver study. Every time, we compared the inclination and anteversion values measured by the proposed system to those from a previously developed optical tracking-based navigation system.


Mean absolute differences for inclination and anteversion were 1.34 ([Formula: see text]) and 1.21 ([Formula: see text])[Formula: see text], respectively, for the cadaver study. Mean absolute differences were 1.63 ([Formula: see text]) and 1.55 ([Formula: see text])[Formula: see text] for inclination and anteversion for the plastic bone study. In both validation studies, very strong correlations were observed.


We successfully demonstrated the feasibility of our system to measure the acetabular orientation during PAO.

Item Type:

Journal Article (Original Article)


04 Faculty of Medicine > Pre-clinic Human Medicine > Institute for Surgical Technology & Biomechanics ISTB [discontinued]
04 Faculty of Medicine > Department of Orthopaedic, Plastic and Hand Surgery (DOPH) > Clinic of Orthopaedic Surgery

UniBE Contributor:

Pflugi, Silvio; Vasireddy, Radhakrishna Rakesh; Lerch, Till; Ecker, Timo Michael; Tannast, Moritz; Siebenrock, Klaus-Arno and Zheng, Guoyan


500 Science > 570 Life sciences; biology
600 Technology > 610 Medicine & health








Lilianna Bolliger

Date Deposited:

18 Jan 2018 16:14

Last Modified:

03 Nov 2019 02:53

Publisher DOI:


PubMed ID:


Uncontrolled Keywords:

Computer-assisted surgery Navigation PAO surgery




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