Practice Quiz

PTA Physical Therapy Assistant

Category - Diseases and Conditions

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Which one of the following is a bone cement?
  1. Polyethylene
  2. Polymethylmethacrylate (PMMA)
  3. Silicone
  4. Titanium
Explanation
Answer: B -Polymethylmethacrylate (PMMA) is bone cement.

Polymethylmethacrylate (PMMA) is called a bone cement. It is not a glue. It does not have adhesive properties. It holds the bone and metal together by forming an interlocking network between the irregularities.

Polyethylene, silicone are non-metallic implants.

Titanium is a metallic implant. It contains 90% titanium, 6 % aluminum, 4% vanadium. It is very strong and has corrosive resistance in nature.
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