Keloid scar on the knee of a 71 year old man three months after total knee replacement (TKR) surgery. A keloid scar is a scar that fills with the skin protein collagen. In a normal scar the collagen breaks down once the wound has healed, but this fails to happen during the formation of a keloid scar. The scar expands from its original boundaries, and continues to grow even after the wound has healed. A TKR involves using surgical implants to replace the bones and cartilage of the knee joint.
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