The degree of subsidence was also measured by changes in the vertical distance between the tip of the greater trochanter and the most proximal point on the implant; a change of more than 2 mm was considered to be evidence of subsidence (Fig. 1). ***Spot welds*** were defined as the presence of new bone formation bridging the gap between the endosteal surface and the surface of the implant. A ***bone pedestal*** was defined as a shelf of endosteal new bone, either partially or completely bridging the intramedullary canal, at the tip of the implant. Calcar remodelling was recorded as hypertrophie, atrophic or indifferent.

And I think your previous question must be "spot weld"

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Note added at 2 hrs (2006-12-10 16:01:27 GMT)
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http://www.findarticles.com/p/articles/mi_qa3767/is_200508/a...

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Note added at 2 hrs (2006-12-10 16:16:16 GMT)
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These are both classic signs of bone remodelling:

http://www.jbjs.org.uk/cgi/content/abstract/87-B/8/1050
Signs of subsidence, radiolucent lines, endosteal bone formation (spot welds) and pedestal formation were used to assess fixation and stability of the stem according to Engh’s criteria.

See spot welds and pedestal formation here: http://www.josonline.org/pdf/v14i2p151.pdf
Very nice pics too :-)

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Note added at 3 hrs (2006-12-10 17:30:21 GMT)
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Of course - silly me - the radiolucent lines are your "Saumbildung".