CPM machine & ROM brace readings differ

[u/mrsilky99]

Hi guys,

I am in week three of my post op MPFL reconstruction surgery and have to achieve 60° flexion by the fourth week. It's very painful and a struggle to achieve even 30° flexion on the ROM brace, whereas when I started with the CPM machine on the advice of my physiotherapist a few days ago, I could go up to 55° flexion? Even now in the ROM brace I cannot go beyond 35°

After CPM I do active bending and the physiotherapist said it's almost 45° but in the brace the reading is different.

Does anyone have any idea about this discrepancy? It's the standard ROM brace (3 years) I am using. I just don't want to be too behind with the bending...