Preliminary clinical and radiographic results of large ceramic heads on highly cross-linked polyethylene

Data are limited regarding large ceramic femoral heads with highly cross-linked polyethylene. We hypothesized that large ceramic head articulation with highly cross-linked polyethylene is safe with a low wear rate, comparable to metal-on-highly cross-linked polyethylene.The study group comprised 63 patients (72 hips) who had undergone total hip replacement (THR) with ceramic-on-highly cross-linked polyethylene between April 2006 and March 2007 with a minimum 2-year follow-up. Postoperative Western Ontario and Mc-Master Universities Arthritis Index (WOMAC) and Hospital for Special Surgery (HSS) scores were used for clinical assessment. Six-week and 2-year radiographs were analyzed by 2 independent observers using Roman 1.70 software. Twenty-six patients (29 hips) had 32-mm and 37 patients (43 hips) had 36-mm Biolox delta ceramic femoral heads (Ceramtec, Plochingen, Germany). Mean patient age was 60.9 ± 8.9 years, and mean follow-up was 2.9 ± 0.5 years. Mean postoperative WOMAC and HSS hip scores were 30.4 and 36.6, respectively. Mean wear at 1 and 2 years postoperatively was 0.06 ± 0.28 and 0.006 ± 0.12 mm/yr for all hips, respectively. Mean wear at 1 and 2 years postoperatively for the 32-mm femoral head was 0.063 ± 0.278 and 0.007 ± 0.126 mm/yr, respectively, and for the 36-mm femoral head was 0.057 ± 0.292 and 0.006 ± 0.118 mm/yr, respectively. No patient had any clinical complications, such as reoperation, infection, fractures, or radiographic evidence of osteolysis or loosening. The early results of THR with large ceramic heads demonstrate high safety and efficacy. Our data with 2-year follow-up show low wear rates, similar to published data for metal-on-highly cross-linked polyethylene.     

人工全膝关节置换后股骨假体角度的CT影像学评估：股骨外上髁线参照与间隙平衡技术的对比研究

[目的]虽然人工全膝关节置换术中假体旋转定位的重要性已得到公认,但术中以哪条轴线为参照能够更加精确的保证股骨假体的旋转定位,目前尚存争议.研究表明股骨外上髁线(TEA)与膝关节屈曲轴线平行,但这一轴线术中难以精确确定.本文采用间隙平衡技术(BG),对比TEA技术在股骨假体实际旋转角度测量的差异 [方法]30例人工全膝关节置换分为2组(每组15膝),分别采用.TEA和BG技术,术后行CT扫描测量股骨假体旋转角度并行膝关节学会评分(KSS).[结果]BG组中股骨假体平均外旋角度为2.7°±1.1°,TEA组为5.6°±1.6°(P=0.001).术后KSS功能评分改善BG组高于TEA组(P=0.002).但两组的KSS膝评分无显著性差异(P=0.39).[结论]研究表明,与BG技术相比,术中应用TEA参照确定股骨假体的旋转定位可导致股骨假体的过度外旋,其术后KSS功能评分亦较差.     

Nasal dermoids — our experience

Dermoid Cysts and fistulas of the nose represent an uncommon embryological error. The frequency of misdiagnosis and recurrences of this lesion indicates the lack of awareness of its occult ramifications which lead to a compromised incomplete excision and are classified as “misadventures”, We would like to present our experience with nasal dermoids — their clinical presentation and management.