Final answer:
The initial indication of neurological impairment in a post-op knee replacement patient can be decreased sensation in the affected leg.
Step-by-step explanation:
The initial indication of neurological impairment in a post-op knee replacement patient can vary depending on the specific patient and circumstances. However, one possible initial indication of neurological impairment could be decreased sensation in the affected leg. This could suggest damage to the nerves in the leg, which can occur during surgery or as a result of the surgery itself.