MURAGAKI Yoshihiro    Department   School of Medicine(Tokyo Women's Medical University Hospital), School of Medicine    Position   Visiting Professor
Language	English
Title	Improvement of Intraoperative plantar pressure measuring system considering physiological loadcondition
Conference	CARS 2019 – 33rd International Congress and Exhibition
Conference Type	International society and overseas society
Presentation Type	Poster notice
Lecture Type	General
Publisher and common publisher	SAKUMA, Ichiro, HOSOI Izumi, KOBAYASHI Etsuko, CHANG,S. S. H. , MAYSUMOTO Tomoyuki, AN Q., ANZAI E, OHTA Y.
Date	2019/06/20
Venue (city and name of the country)	Rennes, France
Society abstract	CARS 2019 21(4) 2019 CARS 2019 – 33rd International Congress and Exhibition
Summary	Purpose Foot deformities such as hallux valgus and flatfoot are common problems that may require surgeries. The ideal foot shape must be reconstructed in three dimensional (3D) orientation by adjusting bones and soft tissues appropriately; otherwise, new foot problems will be brought postoperatively as typified by transfer metatarsalgia after hallux valgus surgery [1]. The types and amounts of bony or soft tissue correction could be based on returning plantar pressures pattern of known appropriate one. To evaluate correction, measurement of plantar pressure in vertical posture is required. However, it is difficult to estimate plantar pressure in standing posture during surgery since the patient is in a supine position under anesthesia. We have proposed a surgical assistance device that can measure plantar pressure under physiological load state of the bones as if the patient is in the standing posture during surgery (Intraoperative Plantar Pressure Measurement (IPPM) device) [2]. We constructed a system to guide an operator to align pushing plate on the patient foot in appropriate location and orientation using surgical navigation technology. It was demonstrated that the plantar pressure distribution can be reproduced similar to that in the standing posture under the condition where the floor reaction force passed near the center of the femoral head and the Center of Pressure (CoP) that is defined as centroid of the applied pressure on the foot was located similar to the CoP during the normal standing posture.