Total knee replacements are more prone to make intermittent clicking noises than total hip replacements. The goal of total knee replacement surgery is to relieve the pain. The surgery is not as a “silencer”! Clicking noises are not uncommon after total knee replacements.
The reason for the clicking noises is maybe because the knee cap abuts against the metallic part below. The knee cap is made of plastic and the part that caps the shin bone is made of metal. When the plastic articulates against the metal, clicking noise may be elicited. Unless accompanied by pain, this noise is considered normal.