Advice for someone who has spinal stenosis and osteoarthritis and torn rotary?

Advice for someone who has spinal stenosis and osteoarthritis and torn rotary? (Question about decision for surgery on 83-year-old mother with spinal stenosis, osteoarthritis, and torn shoulder ligament. Neurosurgeon recommended surgery but said it would be difficult. Caregiver is overwhelmed and unsure whether to recommend surgery.)