title: Soft-tissue balance evaluation system for total hip arthroplasty by intraoperative contact pressure measurement at the hip joint.
abstract: We developed a system for measurement of contact pressure at the hip joint surfaces that enables checking of the artificial hip joint condition during surgery. First, we constructed the pressure sensor that forms the artificial joint. We installed eight small pressure sensors to the spherical head component, a part of the ball-socket joint. Next, we developed software for recording and visualizing the detected pressures that were recorded every 1 ms. The pressure distribution was displayed with the 3D computer graphics in real-time. The system enabled intuitive recognition of pressure direction 3-dimensions. Next, using the system, we conducted measurements during total hip arthroplasty. Although it requires some improvements in its measurement accuracy, the system allows real-time acquisition of information on the artificial hip joint in real-time. Further improvements of the calibration method should enable more accurate measurements. As a complete system, it will be a useful tool for selecting an appropriate implant that fits a patient's hip joint or for estimating the risk of complications after surgery.
authors.affiliation: Institute for High Dimensional Medical Imaging, Jikei University School of Medicine, 4-11-1, Izumi Honcho, Komae-shi, 201-8461, Tokyo, Japan.
authors.forename: Yoshito
authors.initials: Y
authors.lastname: Otake
authors.forename: Naoki
authors.initials: N
authors.lastname: Suzuki
authors.forename: Asaki
authors.initials: A
authors.lastname: Hattori
authors.forename: Mitsuhiro
authors.initials: M
authors.lastname: Hayashibe
authors.forename: Hidenobu
authors.initials: H
authors.lastname: Miki
authors.forename: Mitsuyoshi
authors.initials: M
authors.lastname: Yamamura
authors.forename: Nobuhiko
authors.initials: N
authors.lastname: Sugano
authors.forename: Kazuo
authors.initials: K
authors.lastname: Yonenobu
authors.forename: Takahiro
authors.initials: T
authors.lastname: Ochi
mesh_terms: D019644:Arthroplasty, Replacement, Hip; D003238:Connective Tissue; D006801:Humans; D007564:Japan; D016343:Monitoring, Intraoperative / Q000295:instrumentation*; D011312:Pressure; D025321:Surgery, Computer-Assisted