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I work on wrist model. I tried to add new joint for middle finger because I would like simulate move of middle finger. I prepared new joint (MCP3) based on joint for index finger (MCP2) but middle finger still doesn't move correctly.
I noticed that mass centre of middle finger (midfinger) is exactly in the same place as mass centre of matercarpal bone ( metacarpal3) and middle finger cannot moved properly. For index finger, mass centre of (Iphalanx1 )and matercarpal bone (metacarpal2) are in different places.
I enclose picture with mass centre for index finger and middle finger:

Is it bug in wrist model or my misunderstanding? How should I model joint for middle finger?

can you upload your model here?
Your picture is not clear.

best regards,
jiang

Hi Jiang
Here is my model: https://www.dropbox.com/s/oxp3x3xukn6frif/wrist.osim

hi,

I guess MP3 was a weldJoint (fixed joint) before, and you want to add a joint
like MP2.

The problem is the location of MP3 in parent body should not be (0,-0.03, 0)
You need to redefined it.
I redefined it by estimate the joint center of MP3.

How can I send you the modified model?

Thank you for your help!
You can send model by e-mail: kamil.antos@umu.se

kamilantos wrote:Thank you for your help!
You can send model by e-mail: kamil.antos@umu.se

Sent.

Jiang

hello, I have some problem with the tool RRA and CMC for the model gait2354. someone has a tutorial?THANK