Hi Joe,
Sorry to hear about your injury, sounds very unlucky.
I think this is a bit out of my scope of practice but I would try not to worry about it until you are out of the aircast. I have seen a few athletes with this injury and never had a problem. It might be to do with the stiffness and 'lack of action' of the extensor tendons while they have been in the boot and when you get moving again it will resolve along with a bit of manual treatment if necessary. That would be my first treatment option. If you have functional problems and it really affects your gait I would get an orthopaedic opinion and see if there is issues with the fracture sight.
Of the players I have seen a couple had spasms but not in the way you describe. So it can be a normal response. It is definitely healing as you have identified with the lump but as to whether it is healing 'properly; I would give it another week until you are out of the aircast.
Hope this helps, let us know how you get on after to boot.
Ben






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