Hello, thanks for using HCM.
of the elbow is a serious affection because of the potential complications. Nerves (ulnr say)and vessels (brachial say) supplying the hand and forearm pass along the elbow and when there is an elbow fracture, there is a risk of injuring these structures with consequences on the structures down stream.
A common complication of elbow fracture is dislocation of the radial bone head at the level of the wrist which could cause pains and compression of adjacent structures including vessels and nerves thereby producing the symptoms he has.
It is also possible he has an associated compartment syndrome
which presents with swelling and hardness on the forearm due to raise pressure with the forearm muscle thereby compressing nerves and vessels that supply structures down stream.
This are however serious complications that need to be rule out by an orthopedist urgently and so i will strongly advice your husband consults an orthopedic surgeon immediately.
Best regards and hope this helps.