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For estimating 3-D pose position of artificial knee implants in vivo, there are some studies based on 2-D/3-D image registration of 2-D fluoroscopy images and 3-D geometrical model. Knee implant mainly consists of femoral component and tibial component. Most conventional studies estimate 3-D pose position of femoral component and tibial component individually. Rather, they don't evaluate relative...
Analyzing knee kinematics of implanted knee after Total Knee Arthroplasty (TKA) is affective approach in the research area of orthopaedics. There are some studies based on 2-D/3-D image registration of 2-D fluoroscopy images and 3-D geometric model. However, these conventional studies are designed for still statics image analysis, and there are a few studies for dynamic image of continuously knee...
The pivot shift test has been performed to assess the instability of the knee caused by anterior cruciate ligament (ACL) injuries. However, the test depends on the clinician's subjective feeling. In this study, inertial and magnetic sensors have been introduced into quantitative evaluation of the pivot shift test. The analysis method extracts the knee movement of the pivot shift by using wavelet transformation...
In functional test of hip joint, anatomical coordinate system is user. Anatomical coordinate systems are defined by inputting landmarks manually. Therefore decision of anatomical coordinate systems includes inter-and intra-operator variability. In addition, variability of anatomical coordinate systems will affect results of diagnosis and/or cause critical error of total hip arthroplasty (THA) is operation...
To diagnose total hip arthroplasty (THA) patients, it is important to analyze in-vivo kinematics of the implanted hip joint. There are some conventional analysis methods for estimating the pose/position of the implanted hip joint using 2-D/3-D image registration technique for 3-D multidetector raw CT (MDCT) images and 2-D X-ray radiograph images. One of the remained problems is that estimation results...
The pivot shift test has been performed to assess the instability of the knee caused by anterior cruciate ligament (ACL) injuries. However, the test depends on the clinicianpsilas subjective feeling. In this study, inertial and magnetic sensors have been introduced into quantitative evaluation of the pivot shift test. The analysis method extracts the knee movement of the pivot shift by using wavelet...
Analyzing knee kinematics after total knee arthroplasty (TKA) has been attracting considerable attentions because the knee kinematics can be used to evaluate TKA patients and to evaluate TKA operations and design of knee implants. Knee kinematics can be estimated by 2-D/3-D image registration from 3-D computer-aided design (CAD) models of knee implants to 2-D X-ray image. Although there are many studies...
Rupture of anterior cruciate ligament (ACL) is a serious problem for playing sports, which causes in functional stability of the knee joint. To restore this problem, various operation techniques of ACL reconstruction are proposed. Thus, it is important to numerically characterize the knee kinematics after ACL reconstruction. Then, we proposed an analysis method to estimate the three-dimensional (3-D)...
Rupture of anterior cruciate ligament (ACL) is a serious problem which causes in functional stability of the knee joint. To restore the knee injury, surgical operations, which replace the damaged ACL, have been applied. After ACL reconstruction, it is important to numerically evaluate the knee kinematics to diagnose the ACL reconstruction patients and to evaluate ACL reconstruction operation techniques...
Total hip arthroplasty is a well-established reconstruction technique for deteriorated hip functions. Canal fill ratio, which indicates stability of the stem implanted into the femoral bone, were proposed. However, almost of all the conventional methods were semi-automatic or manual segmentation of the stem, the cortex bone, and the cancellous bone, which can cause variation of the analysis result...
In the field of orthopedic surgery, many types of implant have been used. Especially, revision total hip arthroplasty (THA) uses a metallic implant called support implant to reconstruct the damaged acetabulum. After the revision THA, the support implant might be deformed or be broken in serious cases by the strong load or by the other factors. However, there are few effective diagnosing methods for...
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