Dave's PCF WIP: Paragraphs

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The position of the superior target marker 1008 and the trajectory set by the trajectory port 924 of the tendon trajectory guide 920 determine the location of the inferior target marker 1010. Surgeons may have a specific set of instructions and/or a prescription for the location of the inferior target marker 1010. Multiple factors can influence the location of the inferior target marker 1010 and the trajectory. In one embodiment, the surgeon wants to position the inferior target marker 1010 a millimeter, or so, anterior (along anterior-posterior axis 1006) to two posterior tuberosities 1012 on the plantar side of the calcaneus 224.  These tuberosities can serve as landmarks for designing and fabricating the tendon trajectory guide 920. If the inferior target marker 1010 is too far posterior, along anterior-posterior axis 1006, the lever arm of the FHL may be impacted. If the inferior target marker 1010 is too far anterior, along anterior-posterior axis 1006, the exit point may interfere with arteries and/or nerves on the plantar side of the foot. In certain embodiments, a patient may have a bone spur near the tuberosities 1012, in such a case, a surgeon may provide instructions to position the inferior target marker 1010 anterior to the bone spur.

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