http://www.faqs.org/patents/app/20110263948
With the term "the amount of normal tissue of the subchondral bone" is meant the proportions of the subchondral bone area with bone architecture in a rectangular square of which the height equaled the width of the joint space, and the length at least equaled the width of the entire joint. The joint space is positioned in the centre of this square (see FIG. 3). As shown in more detail in the examples hereinafter, the area with bone architecture is meant to include all area excluding the radiotranslucent area within the aforementioned square. As used herein, the radiotranslucent area within the aforementioned square, is meant to include all area where osteolytic activity and remodelling caused a disarrangement of the trabecular pattern, or where a complete loss of the trabecular structure had occurred.
crap English - rectangular square pfffff
They mean rectangle.
The translation workplace 
peer agreement (net): +4
