Zimmer公司推出微创侵入性胫骨移植物

一种新式模块化有轴胫骨移植物，能够装配在患者体内，从而将手术创伤性降低到最小。这种胫骨配件已经得到了美国食品药品管理局的批准。

这种新型移植物设计用于微创侵入性解决方案（MIS），这是一种由Zimmer控股公司提供的全膝关节手术方案，特别适合于Zimmer MIS四头肌保全的全关节手术，该技术设计保留四头肌肌腱和肌肉，而不是切除或者处理它们。与传统的全关节置换手术相比较，四头肌保全技术的切口较小而且较不明显，产生的组织血肿也较小。同时患者住院时间较短，运动范围的恢复也更快。

其中一项允许移植物能够适应较小的暴露的设计元素是外型轮廓以及龙骨长度较小。龙骨长度减少使得通过较小开口将移植物插入关节中成为可能。在将移植物固定到胫骨近端之后，轴的延伸部分能够从骨板中伸出。Zimmer公司相信：这种新型移植物设计的额外好处将使得微创侵入性手术变得更加方便。

Robert Wood Johnson医学院整形外科手术临床教授四头肌保留技术的开发者 Alfred J. Tria说：“MIS有轴胫骨骨板使得我们能够在很小的切口范围内将部件植入，能够更加方便地进行四头肌保留膝关节置换手术。”
 
Minimally Invasive Tibial Prosthesis
 
A new modular stemmed tibial prosthesis can be assembled within a patient, making the procedure minimally invasive. This tibial component has been cleared by the U.S. Food and Drug Administration (FDA).

The novel implant is designed to be used with all of the minimally invasive solutions (MIS) offered for total knee procedures by Zimmer Holdings, Inc. (Warsaw. IN, USA), and is particularly well suited for use with the Zimmer MIS quad-sparing total knee procedure, a technique designed to avoid the quadriceps tendon and muscles rather than cutting through or manipulating them. When compared to traditional total knee replacement techniques, the quad-sparing technique is accomplished through a smaller and less conspicuous incision and produces less tissue trauma. Also, patients usually require a shorter hospital stay and experience a faster improvement in range of motion.

One of the design elements that permits the implant to accommodate a smaller exposure is the low profile and the length of the keel. The subsequent reduced keel length allows the implant to be inserted into the joint through a smaller opening. After the implant has been fixed in place on the proximal tibia, a stem extension can be dropped down through the plate. Zimmer believes that the additional benefits of the new implant design will further facilitate the minimally invasive procedure.

“The MIS stemmed tibial plate will allow us to insert the component within the confines of the small incision for quadriceps-sparing knee replacement with greater ease,” said Alfred J. Tria, Jr., a developer of the quad-sparing technique and a clinical professor of orthopedic surgery at Robert Wood Johnson Medical School (New Brunswick, NJ, USA).