dear therapist
being c3-c4 level surviving with decreased tone may be a case of incomplete case of quardriparesis.you didnot mention the type of pain ,nature ,and whether it is aggravated by exs and reduced with rest and also whether it is unilateral or bilateral pain
where is the exact origin of pain ?pain is starting from neck and radiates downward to shoulder or from shoulder to neck
whether the pain is increased with respiratory movement?
assess carefully and repeat any investigation like MRI or CT to rule out for infection like TB or any Disc prolapse or Cervical spondylosis
but timebeing you can use TENS to reduce pain or Cryotherapy
all the best
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