Final answer:
If a client with Parkinson's disease no longer has intractable tremors after stereotactic surgery, it indicates that the surgery had its intended effect.
Step-by-step explanation:
Parkinson's disease is a neurodegenerative disorder characterized by the loss of dopaminergic neurons in the substantia nigra. One of the main goals of stereotactic surgery for Parkinson's disease is to alleviate intractable tremors. Therefore, if the client no longer has intractable tremors, it indicates that the surgery had its intended effect. This is because stereotactic surgery aims to interrupt the abnormal neural circuits responsible for causing the tremors.