Is there a way I can restrict a field in TFS for the creator of the ticket once the ticket reached a particular status? For example I have created ticket 123 in TFS and the assignee of the ticket set it to In Progress status. I as the requester should not be able to edit the Issue Description field since the ticket is already being worked on by the assignee.
There is no way to limit access to a different specific user per work item state.
You can add limited for a Group or Individual for a particular state, but it would always be the same individual.
If this problem is not rife then you can simply add a notification for the creator when the work item changes, you can for to the bits that you want, and have users self police.