Nem hiszem, hogy van rá bevett magyar kifejezés, de holnap rá tudok kérdezni.

http://www.freepatentsonline.com/y2007/0093844.html

"1. A calcar planer for use in planing a calcar surface of a bone, comprising: a shaft including a first longitudinal axis; a cutting head including a second longitudinal axis; and a torque transmitting coupler connecting said shaft and said cutting head, said coupler transferring torque between said shaft and said cutting head when said first and second axes are coaxially aligned and when said first and second axes are not coaxially aligned.

2. The calcar planer of claim 1, wherein said coupler comprises a flexible coupler which enables said first and second axes to be selectively not coaxially aligned.

3. The calcar planer of claim 1, wherein said coupler comprises a constant velocity universal joint, said constant velocity universal joint transmitting constant rotational velocity from said shaft to said cutting head when said first and second axes are coaxially aligned and when said first and second axes are not coaxially aligned."

http://www.freepatentsonline.com/20070093844.pdf

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Note added at 1 day13 hrs (2009-12-09 08:34:29 GMT)
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A fenti discussion részben leírtak alapján én inkább a "fúrópajzs meszes csonthoz" megoldást javaslom.

Lásd képek és leírások:
http://www.biomet.se/userfiles/files/pdf/Sweden/Comprehensiv...

http://www.symmetrymedical.com/images/uploads/symmetry calca...

http://www.zimmer.com/web/enUS/pdf/surgical_techniques/__Ver...