Figure 7
A plantar calcaneal spur of the medial process is shown in a sagittal plane. (A) A Giemsa-stained medial slice of a plantar calcaneal spur is depicted with inferior (i) and anterior (a) plantar fascia insertion areas. The black arrow point at enthesial fibrocartilage. (B) The silver staining corresponding to (A) indicates a different collagen orientation of the plantar fascia attaching to the anterior region of the spur (black arrow) compared to the collagens directed in a sagittal plane inserting the posterior region of the spur (black dotted arrow). (C) Giemsa-stained slice located laterally to (A), (D) Silver-stained slice corresponding to (C); curved black arrow, deep collagen bundles; dotted arrow, superficial collagens, (E) Giemsa-stained slice located laterally to (C); red arrow, tapered area, (F) Silver-stained slice corresponding to (E); Black asterisks, flexor digitorum brevis muscle; curved black arrow, deep collagen bundles; dotted arrow, superficial collagens; s, superior; p, posterior.
