visual3d:documentation:modeling:segments:hip_joint_landmarks
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visual3d:documentation:modeling:segments:hip_joint_landmarks [2024/06/19 12:48] – sgranger | visual3d:documentation:modeling:segments:hip_joint_landmarks [2024/07/17 15:45] (current) – created sgranger | ||
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- | {{{{**estimates for the right and left hip joint center are represented as landmarks relative to the coda and v3d_composite pelvis segment coordinate systems.** | + | ====== Hip Joint Landmarks ====== |
- | **you should notice the following | + | **Estimates |
- | - the left and right side landmarks are defined exactly the same, except the ml direction | + | **You should notice |
- | - the only difference between the equations | + | |
- | ==== model metrics ==== | + | - The left and right side landmarks are defined exactly the same, except the ML direction for one side is negated. |
+ | - The only difference between the equations for the CODA and V3D_Composite pelvis segments is that there is an offset (0.5*RPV_Depth-Target_Radius_ASIS). This is because the origin of the V3D_Composite pelvis is 50% of pelvis depth compared to the CODA pelvis origin. | ||
- | you will see the following model metrics used in the equations below. these model metrics are automatically created when you create the coda or v3d_composite pelvis. | + | === Model Metrics === |
- | |**asis_distance** | + | You will see the following model metrics used in the equations below. These model metrics are automatically created when you create |
- | |**rpv_depth** | + | |
- | |**target_radius_asis**|the radius of the marker placed on the asis landmark | + | |
- | **note:** rpv_depth is included in the subject metrics starting in version 5 and the target_radius_asis is included in the subject metrics starting in version 6. | + | |**ASIS_Distance** |The 3D distance between |
- | in previous versions, these metrics must be added manually | + | |**RPV_Depth** |
- | ===== bell and brand hip joint ===== | + | |**Target_Radius_ASIS**|The radius of the marker placed on the ASIS landmark |
- | when you create | + | **NOTE:** RPV_Depth is included in the subject metrics starting in Version 5 and the Target_Radius_ASIS is included in the subject metrics starting in Version 6. |
+ | In previous versions, these metrics must be added manually | ||
+ | ==== Bell and Brand Hip Joint ==== | ||
- | * since the pelvis depth is defined differently between the coda and v3d_composite | + | When you create |
- | |bell & brand | | + | |
- | |coda coordinate system| | + | |
- | |rhjc | | + | |
- | |ml |0.36*asis_distance |0.36*asis_distance | + | |
- | |ap |-0.19*asis_distance|-0.19*asis_distance + ( 0.5*rpv_depth-target_radius_asis )|| | + | |
- | |axial | + | |
- | |lhjc | | + | |
- | |ml |-0.36*asis_distance|-0.36*asis_distance | + | |
- | |ap |-0.19*asis_distance|-0.19*asis_distance + ( 0.5*rpv_depth-target_radius_asis )|| | + | |
- | |axial | + | |
- | **bell al, pederson dr, and brand ra** (1989) prediction of hip joint center location from external landmarks. | + | |Bell & Brand | |
- | human movement science. 8:3-16: | + | |CODA Coordinate System| |
- | **bell al, pedersen dr, brand ra** (1990) a comparison of the accuracy of several hip center location prediction methods. | + | |RHJC | |
- | j biomech. 23, 617-621. | + | |ML |0.36*ASIS_Distance |0.36*ASIS_Distance |
- | **note that if the asis markers have been placed medial or lateral to the palpated landmark because the subject is overweight or because the markers can not be placed at these locations, it is important to measure the inter-asis distance and enter this value into the subject properties tab.** | + | |AP |-0.19*ASIS_Distance|-0.19*ASIS_Distance + ( 0.5*RPV_Depth-Target_Radius_ASIS )|| |
+ | |Axial | ||
+ | |LHJC | | ||
+ | |ML |-0.36*ASIS_Distance|-0.36*ASIS_Distance | ||
+ | |AP |-0.19*ASIS_Distance|-0.19*ASIS_Distance + ( 0.5*RPV_Depth-Target_Radius_ASIS )|| | ||
+ | |Axial | ||
- | **note that in the 1990 article the ml distance is listed as 0.14 instead | + | **Bell AL, Pederson DR, and Brand RA** (1989) Prediction |
+ | Human Movement Science. 8:3-16: | ||
+ | **Bell AL, Pedersen DR, Brand RA** (1990) A Comparison | ||
+ | J Biomech. 23, 617-621. | ||
+ | **Note that if the ASIS markers have been placed medial or lateral to the palpated landmark because | ||
- | bb90.jpg bb90a.jpg | + | **Note that in the 1990 article the ML distance is listed as 0.14 instead of 0.36 as used by Visual3D. The confusion lies in the location of the origin of the pelvis used in the article. Visual3D uses the mid-point of the ASIS, the article uses the Right ASIS location.** |
- | ===== harrington hip joint ===== | + | {{: |
- | // | + | ==== Harrington Hip Joint ==== |
- | * the second set of equations requires the user to manually measure leg length. if you do not plan to manually measure leg length, use the first set. | + | |
- | * since the pelvis depth is defined differently between the coda and v3d_composite pelvis, use the set of equations which corresponds to the pelvis type you are using. | + | |
- | ==== harrington 1 ==== | + | // |
+ | * The second set of equations requires the user to manually measure leg length. If you do not plan to manually measure leg length, use the first set. | ||
+ | * Since the pelvis depth is defined differently between the CODA and V3D_Composite pelvis, use the set of equations which corresponds to the pelvis type you are using. | ||
- | |harrington equation | + | === Harrington |
- | |coda coordinate system| | + | |
- | |rhjc | | || | + | |
- | |ml |0.33*asis_distance + 0.0073 |0.33*asis_distance + 0.0073 | + | |
- | |ap |-0.24*rpv_depth - 0.0099 | + | |
- | |axial | + | |
- | |lhjc | | || | + | |
- | |ml |-0.33*asis_distance - 0.0073|-0.33*asis_distance - 0.0073 | + | |
- | |ap |-0.24*rpv_depth - 0.0099 | + | |
- | |axial | + | |
- | ==== harrington 2 ==== | + | |Harrington Equation 1 | | || |
+ | |CODA Coordinate System| | ||
+ | |RHJC | | || | ||
+ | |ML |0.33*ASIS_Distance + 0.0073 |0.33*ASIS_Distance + 0.0073 | ||
+ | |AP |-0.24*RPV_Depth - 0.0099 | ||
+ | |Axial | ||
+ | |LHJC | | || | ||
+ | |ML |-0.33*ASIS_Distance - 0.0073|-0.33*ASIS_Distance - 0.0073 | ||
+ | |AP |-0.24*RPV_Depth - 0.0099 | ||
+ | |Axial | ||
- | |harrington equation | + | === Harrington 2 === |
- | |coda coordinate system| |v3d_composite coordinate system | + | |
- | |rhjc | + | |Harrington Equation |
- | |ml | + | |CODA Coordinate System| |V3D_Composite Coordinate System |
- | |ap | + | |RHJC |
- | |axial |-0.16*asis_distance | + | |ML |
- | |lhjc | + | |AP |
- | |ml | + | |Axial |-0.16*ASIS_Distance |
- | |ap | + | |LHJC |
- | |axial |-0.16*asis_distance | + | |ML |
+ | |AP | ||
+ | |Axial |-0.16*ASIS_Distance | ||
\\ | \\ | ||
- | **harrington me, zavatsky ab, lawson se, yuan z, theologis tn.**(2007) | + | **Harrington ME, Zavatsky AB, Lawson SE, Yuan Z, Theologis TN.**(2007) |
- | j biomech. 2007; | + | J Biomech. 2007; |
- | ===== davis hip joint ===== | + | ==== Davis Hip Joint ==== |
+ | |||
+ | If no clinical measurements are taken, the following values are calculated: | ||
- | if no clinical measurements | + | Estimates for the Right and Left Hip Joint Center |
- | estimates for the right and left hip joint center are represented as landmarks that are created automatically when the helen hayes pelvis segment is created. the location of the landmarks are defined in the pelvis segment coordinate system as: | + | |Davis |
+ | |CODA Coordinate System| | ||
+ | |RHJC | | | ||
+ | |ML |- (C * sin(theta) -0.5 * ASIS_distance) | ||
+ | |AP |(-Xdis-Rmarker) * cos(beta)+ C * cos(theta) * sin(beta)| | ||
+ | |Axial | ||
+ | |LHJC | | | ||
+ | |ML |(C * sin(theta) -0.5 * ASIS_distance) | ||
+ | |AP |(-Xdis-Rmarker) * cos(beta)+ C * cos(theta) * sin(beta)| | ||
+ | |Axial | ||
- | |davis | | + | |Davis - Metric Values |
- | |coda coordinate system| | + | |If LegLength is measured manually: |
- | |rhjc | + | |LegLength |
- | |ml | + | |If LegLength is NOT measured manually:| | |
- | |ap | + | |RightLegLength |
- | |axial |(-xdis-rmarker) | + | |LeftLegLength |
- | |lhjc | + | |LegLength |
- | |ml | + | |C |0.115*LegLength |
- | |ap | + | |theta |28.4*PI/ |
- | |axial |(-xdis-rmarker) | + | |beta |
+ | |If Xdis is measured manually: | ||
+ | |Xdis |anterior/ | ||
+ | |If Xdis is NOT measured manually: | ||
+ | |Xdis |0.1288*LegLength | ||
+ | |Rmarker | ||
- | |davis - metric values | + | These equations are adapted from the article: |
- | |if leglength is measured manually: | + | |
- | |leglength | + | |
- | |if leglength is not measured manually: | + | |
- | |rightleglength | + | |
- | |leftleglength | + | |
- | |leglength | + | |
- | |c | + | |
- | |theta | + | |
- | |beta |18.0*pi/ | + | |
- | |if xdis is measured manually: | + | |
- | |xdis |anterior/ | + | |
- | |if xdis is not measured manually: | | | + | |
- | |xdis |0.1288*leglength - 0.04856 | + | |
- | |rmarker | + | |
- | these equations are adapted from the article: | + | **Davis RB, Ounpuu S, Tyburski D, Gage JR.** (1991) "A Gait Analysis Data Collection and Reduction Technique." |
- | **davis rb, ounpuu s, tyburski d, gage jr.** (1991) "a gait analysis data collection and reduction technique." | ||
- | }}}} |
visual3d/documentation/modeling/segments/hip_joint_landmarks.1718801334.txt.gz · Last modified: 2024/06/19 12:48 by sgranger