Sheen points out that the femoral stems and heads made out of titanium or cobalt chromium along with acetabular cups made of ul-tra-high-molecular-weight polyethylene, which are covered by NHI, wear out extremely slowly, typically functioning quite well for 15 – 20 years. For a patient who is over 70 at installation, the hip should never need replacing.
沈茂庭指出，健保給付的鈦合金或鈷鉻鉬合金材質「股骨」，以及高耐磨高分子聚乙烯的「髖臼內襯」，磨損率已相當低，正常狀況下可使用 15～20 年，若老人家已經年過 70，應已綽綽有餘。