Final answer:
The priority manifestation of degenerative complications in Parkinson's disease is postural instability.
Step-by-step explanation:
Parkinson's disease is a degenerative disorder that affects the muscular system and movement. The nurse should include in the teaching that the priority manifestation of degenerative complications is postural instability. Although tremors, bradykinesia, and rigidity are also common symptoms of Parkinson's disease, postural instability can lead to falls and injuries, making it the priority manifestation to address.