Thumb Analysis
A computer kinematic assessment is performed for thumb flexion/extension. The
Examinee is asked to perform each maneuver 8-10 repetitions to full range and as
quickly as possible. The events are video taped in a precisely calibrated field
for computer analysis. Each event is analyzed for total dynamic range of motion
and peak velocity quantity and quality. Consistency of results [coefficient of
variation] is considered for determining Examinee effort. After a thorough
discussion of expectations, and agreement of understanding by the Examinee, the
Examinee is asked to perform the movement events.
Preparation
- APAS - CAPDV;
- Chair
- DV Camcorder with firewire connection to the data collection computer;
- Calibration frame.
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| Large frame |
Small frame |
Room Setup
- Clear the working area of any obstructions that may block the camera
views.
- Place a reflective marker (fixed point) anywhere in the view where the
Examinee or Assistant/Examiner will not block it during motion.
Camera Setup
- Look through the viewfinder, make sure you can see the entire frame - plus
enough space surrounding frame - to film the entire sequence.
- Set focus to auto focus then back to manual focus.
- Set shutter speed at 1/250 s.
[ Last revised on 01/12/2004 ]
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Examples |
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Description |
| Markers |
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Five markers |
| # |
Left |
Right |
Description |
| 1. |
L.TIP |
R.TIP |
Tip of thumb |
| 2. |
L.IP |
R.IP |
IP joint |
| 3. |
L.MP |
R.MP |
MP joint |
| 4. |
L.WRIST |
R.WRIST |
Radial aspect of wrist |
|
| Calibration |
 |
Small calibration cube |
Check computer screen and recheck the position of the cube, the cameras, and
the fixed point.
Capture data for 0.5 s.
|
| Protocol |
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Make sure Examinee is in center of view field. The Examinee must be aligned in the
field of the front portion of the calibration cube. If acceptable, proceed with
data collection.
Capture data for 25 s.
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Cervical Flexion |
Cervical Extension |
[ View typical results ] |
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Picture 38:
LeftThumb Flexion -
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Picture 39:
LeftThumb Extension -
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Picture 40:
RightThumb Flexion -
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Picture 41:
RightThumb Extension -
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Chart 14:
Thumb MP Flexion/Extension
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Table 14:
Thumb MP Flexion/Extension (F/E)
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Chart 15:
Thumb IP Flexion/Extension
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Table 15:
Thumb IP Flexion/Extension (F/E)
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Summary 9:
Thumb Flexion/Extension
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See also
- Number of tests where Examinee performed subnormal:
4
of
8
- Number of tests where Examinee performed asymmetrically (one side worse than the other):
3
of
8
- Number of tests where Examinee performed worse on Left Side than on Right Side:
0
of
4
- Number of tests where Examinee performed worse on Right Side than on Left Side:
3
of
4
Significant Findings Thumb Flexion/Extension:
