Mulier Michiel, Rys Bart, Moke Lieven
Department of Orthopaedic Surgery, University Hospital Pellenberg, Leuven, Belgium.
Acta Orthop Belg. 2006 Jun;72(3):326-31.
The most important factors for long-term survival of cementless prostheses are the initial fixation, the osteoconducting properties of the metal shell and the bony response. Porous tantalum, a new biomaterial with a geometric structure similar to trabecular bone, was reported in animal studies to allow for bone ingrowth even when 3-mm gaps exist between the implant and the bone. This new material may improve the durability and stability of hip arthroplasties. We analysed the behaviour of the underlying acetabular bone, based on radiographs taken 46 months or longer after implantation of monoblock cementless acetabular cups made of porous tantalum. Clinical evaluation was done by means of the Harris Hip Score. The acetabular ARA-score, ranging from poor to excellent, was excellent in 80 % of the cases, 46 months or longer after implantation. The clinical condition of the patients as assessed with the Harris Hip Score was excellent for 65 % of the patients.
非骨水泥型假体长期存活的最重要因素是初始固定、金属外壳的骨传导特性以及骨反应。多孔钽是一种新型生物材料，其几何结构与松质骨相似，动物研究表明，即使植入物与骨骼之间存在3毫米的间隙，它也能促进骨长入。这种新材料可能会提高髋关节置换术的耐用性和稳定性。我们根据多孔钽制成的一体式非骨水泥髋臼杯植入46个月或更长时间后拍摄的X光片，分析了髋臼下方骨骼的情况。通过Harris髋关节评分进行临床评估。髋臼ARA评分从差到优，植入后46个月或更长时间，80%的病例为优。根据Harris髋关节评分评估，65%的患者临床状况良好。
