I had a finger crush injury, index finger complete tendon

Patient: I had a finger crush injury, index finger complete tendon repair bands n slip. Now on my ring finger i smashed my nail bed on down to the joint just below it, now as time goes on (50 days now) i trimmed the cuticle area that was no longer attached & ive noticed no nail is growing back, just skin. The top of the nail is still firmly attached & not discolared. The therapy lady told me today i may have damaged my matrix, if that is the case will my nail for real never grow back? & if so wont that skin be at risk for infections?

Doctor: