What is the significance of cement mantle thickness in cemented arthroplasty?

• A. Ensures adequate interfacial strength; too thin leads to higher risk of loosening; too thick may cause heat generation and cement fracture.
• B. The thicker the better; there is no downside.
• C. Mantle thickness has no clinical significance.
• D. Thinner mantle always improves revision rates.

Answer: (A)

Mantle thickness matters because the cement layer that bonds bone to the prosthesis must both carry load and protect surrounding bone from excessive heat during curing. When the mantle is too thin, there isn’t enough cement to distribute stresses well at the bone–cement interface, increasing the risk of micromotion, cement fatigue, and loosening over time. On the other hand, an excessively thick mantle can generate more heat as the cement cures, potentially causing thermal injury to bone, higher intramedullary pressure, and a greater chance of cement fracture or failure. The goal is an optimal thickness that provides secure interfacial bonding without exposing bone to damaging heat or introducing brittle cement.

The other statements don’t fit because they either imply no downside to a thicker mantle, deny any clinical significance, or claim that thinner mantles always improve revision outcomes, all of which ignore the balance between mechanical stability and thermal/biological risks.