例句與造句

1. (3 ) twenty-seven hips in 21 patients with femoral head osteonecrosis were treated with mcminn's surface replacement arthroplasty and were reviewed 1-6 years after the operation
   (3)對21例27髖股骨頭缺血性壞死病例行mcminn型假體髖關(guān)節(jié)表面置換術(shù)后1-6年觀察，隨訪評價(jià)其療效。
2. It's difficult to find surface replacement in a sentence. 用surface replacement造句挺難的