pyCGM_Single.pyCGM.elbowJointCenter

pyCGM_Single.pyCGM.elbowJointCenter(frame, thorax, shoulderJC, wand, vsk=None)

Calculate the Elbow joint axis ( Humerus) function.

Takes in a dictionary of marker names to x, y, z positions, the thorax axis, and shoulder joint center.

Calculates each elbow joint axis.

Markers used: RSHO, LSHO, RELB, LELB, RWRA ,RWRB, LWRA, LWRB Subject Measurement values used: RightElbowWidth, LeftElbowWidth

Parameters

frame

Dictionaries of marker lists.

thoraxarray

The x,y,z position of the thorax.

shoulderJCarray

The x,y,z position of the shoulder joint center.

wandarray

The x,y,z position of the wand.

vskdict, optional

A dictionary containing subject measurements.

Returns

origin, axis, wrist_Oarray

Returns an array containing a 2x3 array containing the right elbow x, y, z marker positions 1x3, and the left elbow x, y, z marker positions 1x3, which is followed by a 2x3x3 array containing right elbow x, y, z axis components (1x3x3) followed by the left x, y, z axis components (1x3x3) which is then followed by the right wrist joint center x, y, z marker positions 1x3, and the left wrist joint center x, y, z marker positions 1x3.

Examples

>>> import numpy as np
>>> from .pyCGM import elbowJointCenter
>>> frame = {'RSHO': np.array([428.88, 270.55, 1500.73]),
...          'LSHO': np.array([68.24, 269.01, 1510.10]),
...          'RELB': np.array([658.90, 326.07, 1285.28]),
...          'LELB': np.array([-156.32, 335.25, 1287.39]),
...          'RWRA': np.array([776.51,495.68, 1108.38]),
...          'RWRB': np.array([830.90, 436.75, 1119.11]),
...          'LWRA': np.array([-249.28, 525.32, 1117.09]),
...          'LWRB': np.array([-311.77, 477.22, 1125.16])}
>>> thorax = [[[256.23, 365.30, 1459.66],
...        [257.14, 364.21, 1459.58],
...        [256.08, 354.32, 1458.65]],
...        [256.14, 364.30, 1459.65]]
>>> shoulderJC = [np.array([429.66, 275.06, 1453.95]),
...            np.array([64.51, 274.93, 1463.63])]
>>> wand = [[255.92, 364.32, 1460.62],
...        [256.42, 364.27, 1460.61]]
>>> vsk = { 'RightElbowWidth': 74.0, 'LeftElbowWidth': 74.0,
...         'RightWristWidth': 55.0, 'LeftWristWidth': 55.0}
>>> [np.around(arr, 2) for arr in elbowJointCenter(frame,thorax,shoulderJC,wand,vsk)] 
[array([[ 633.66,  304.95, 1256.07],
[-129.16,  316.86, 1258.06]]), array([[[ 633.81,  303.96, 1256.07],
[ 634.35,  305.05, 1256.79],
[ 632.95,  304.84, 1256.77]],
[[-129.32,  315.88, 1258.  ],
[-128.45,  316.79, 1257.36],
[-128.49,  316.72, 1258.78]]]), array([[ 793.32,  451.29, 1084.43],
[-272.46,  485.79, 1091.37]])]