Login Login



Wanted articles
Who is online?
Article tools

Difference between revisions of "Introduction"

From Orthoload Wiki

Jump to: navigation, search
(What is there to see in OrthoLoad videos?)
(How to use OrthoLoad?)
Line 18: Line 18:
'''Enter DATABASE''' and in the top left frame ''''Joint Loads'''' you can choose an ''''Implant'''' type, an ''''Activity'''', possibly an additional ''''Parameter'''', a ''''Patient'''' and a trial by ''''File Name''''. Then an '''OrthoLoad''' video will be shown on the right frame ''''Now Selected''''.
[[File:What see orthoload big.png|thumb|right|What see orthoload|180px]]
[[File:What see orthoload big.png|thumb|right|What see orthoload|180px]]

Revision as of 14:00, 6 October 2014

What is OrthoLoad?

OrthoLoad is a public database containing the loads acting in orthopaedic implants. They were measured in vivo using instrumented implants with telemetric data transmission. Currently load data are available for the

Hip joint, shoulder joint, knee joint, vertebral body replacement and internal spinal fixator.

Data is presented as videos, containing the time-dependent forces and moments, force vectors, video images of the patients activity and numerical data. Many results involving the 'Hip Joint' are already available in the database. More data are continuously added from the actual 'Hip Joint III' where also the three moments were measured.  From hip and knee implants, only selected examples are available because access to this data must be detained until it has been published in scientific journals.

From the OrthoLoad database you can select an implant, an activity with parameters, a patient and one or several trials. The time course of the loads is shown in videos (encoded in the wmv- or mp4-format) and can be analyzed in more detail by displaying single video frames. Numerical data files (text files, suffix .akf) can additionally be downloaded and the forces and moments then be used in finite element studies or joint simulators, for example.

It's recomended to run OrthoLoad on a Windows PCs with Media Player Classic, VLC Player or FairPlay Lite player or on Linux/Mac OS X with VLC Player!

How to use OrthoLoad?

Enter DATABASE and in the top left frame 'Joint Loads' you can choose an 'Implant' type, an 'Activity', possibly an additional 'Parameter', a 'Patient' and a trial by 'File Name'. Then an OrthoLoad video will be shown on the right frame 'Now Selected'.

What see orthoload

If you select an OrthoLoad video (menu DATABASE), a mp4-video is displayed which shows all data of a measurement. This video is a OrthoLoad video with the name TRIAL_DATE_#_#_screen.mp4. The videos encoded in the wmv or mp4(H.264) format are avalible.

If you play the video in a media player or select a single frame from the video, the vertical marker line in the force diagram shows you the actual measuring time. All other data is displayed synchronously to this time (patient video, vectors, tables ...).

From the 'Hip Joint', only the forces were measured and no moment diagram is shown. For all other implants forces and moments are  shown in the measuring units %BW and %BW*m. Using the patients' body weight (BW), you can recalculate the values in N and Nm.

Select, show & download OrthoLoad videos

File Name Select a video by implant type and activity

File Name

In the top left frame of the DATABASE, you can choose an implant type, an activity, possibly an additional parameter, a patient and a trial. Then a OrthoLoad video will be shown on the right side.

Select a video by file name
Select Video

In the left bottom frame of the DATABASE, you type a file name. Then a OrthoLoad video will be shown on the right side. For example, if the complete name of the OrthoLoad video is s1r_211005_1_80_screen.mp4, then type in only s1r_211005_1_80. This is the basic trial number.

Show or download videos

Using the buttons, you can either directly play the video or download it. If you just play the video in a browser, your browser will play the video with Flash Plug-in. If you download and play the video on your computer, your PC will play the video with your standard video player. We clearly favour the Media Player Classic or VLC Player for a Windows and VLC Player for Mac OS X and Linux

Download Screenshot

Download Screenshot

The screenshot shows all data for the instant of maximum resultant force. You can download using the button on the left side. The name of the screenshot contains the trial name. A picture of the trial S1R_211005_1_80 for example will be S1R_211005_1_8_fmax.png.

Download data file

You select a video (see above) and use the buttons 'Show' and 'Download' for 'Data' to open or download the data file *.akf belonging to the video *.wmv/*.mp4.

Download additional data file

Additional Data

You select a video (see above) and use the bottom left box 'Additional Data File' (if available) to open or download the data file (*.eof, *.cof etc.) belonging to the video *.wmv/*.mp4.



A coil for the inductive power supply is arranged around the implant and the antenna is placed close to it. The data received is at first controlled in regard to transmission errors and then led to a notebook where the forces and moments are calculated and displayed in real time. The images of the patients' exercises and the synchronous data stream are both recorded on the same video tape. On a monitor or using a video beamer, the forces and moments can be controlled immediately. This allows one to detect unexpected loading situations and immediately modify the way an exercise is performed.