In the process of preoperative planning, two X-ray images (AP and LAT) of the knee joint are taken. In our novel method, they are taken with a 3D marker attached on the surface of the patient's lower leg. And the silhouette of the marker in the images are used to couple the two X-ray images three dimensionally(3D).
With the aid of VR technology, the size selection and settlement of the implants can be performed in 3D way.
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Exploits the now pervasive Digital Medical Imaging environment. |
How to matching marker.
 VIDEO(WMV) |
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Enhances the reliability of preoperative planning using the 3D VR spatial templating as opposed to the traditional 2D templating. |
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VR technology created 3D framework for the planning from two original 2D X-ray Images. |
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Spatial error for the orientation ,distance and the rotation of the patient's knee at the photographing are appropriately corrected. |
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Optional CT data enables the precise determination of the rotaion and position in the axial plane. |
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Predicts the thickness of the cutoff piece of the bone as a guiding information for the surgeon. |
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| Input data format |
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DICOM3.0 , BMP , JPEG |
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| Viewing |
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Surface rendering , Wireframe , Silhouette , Transparency ,
Volume rendering , Zoom in/out , Panning , Rotation ,
Intensity and contrast |
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| Analyzing |
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Implant size selection , Positioning of the implant ,
Orientation and position of the cutting plane ,
Thickness of the cutoff |
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| Other features |
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Indicating the bone axes ,
Separating the CT volume data into femur and tibia parts ,
Undo/redo |
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The images are through the courtesy of
Shonan Kamakura Joint Reconstruction Center
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Case I ) Case with bone defect on the medial side of the right knee, in which 3D template was effectively used.
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Preoperative planning by 3D templating of ATHENA |
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This case with bone defect on the medial side of the right knee was operated exactly as the planning. |
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Case II ) Osteoarthrosis of the Knee after High Tibial Osteotomy(HTO).
3D template Athena was very useful to determine the cut level of tibia and appropriate size of the implant.
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The surgery was performed using the same implant as the planning by Athena. |
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The coverage on the tibia and the osteophyte were operated exactly as the pre-operative planning, It was safely performed in MIS procedure for an hour and 45 minutes.
This patient also left hospital by herself with a single cane on the tenth day. |
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System requirements
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WindowsXP , Windows2000 or later |
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Pentium4 1.4GHｚ+ |
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| Memory |
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512MB+ |
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| Video environment |
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1280 x 1024+ , RAM128MB+ |
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Supervised by Dr. I.Tatsumi
Deputy director of Shonan Kamakura Joint Reconstruction Center |
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Contact |
