Hi, thanks for writing to HCM.
A 4 week old tibial plateau fracture
treated by internal fixation
doesn't need a hinged knee brace
to be worn at night time.
As the fracture will be held rigidly by the implants inside (plates & screws), no further external support is necessary.
In case of fixation of a comminuted fracture (multiple pieces of bones), it is safer to use a brace even at night times.
Hope this information is helpful. Good day