“…Our other three cases were local sessile intra-articular SH located near the superior pole of the patella, by far the most frequent location in the anterior compartment of the knee ( 5 – 8 , 19 , 21 , 24 , 27 – 29 , 38 , 40 , 42 , 44 , 50 , 53 – 57 ), followed by the infrapatellar fat pad ( 11 , 18 , 23 , 30 , 45 , 59 ), the posterior compartment, the medial compartment ( 2 – 4 , 25 , 35 , 39 , 42 , 54 , 61 ) and the intercondylar notch ( 22 , 43 , 46 , 47 , 54 ). The three reported patients with KSH near the superior pole of the patella had the rare phenomenon of bone erosion, which was localized in the patella in two cases, a previously undescribed location for KSH bone erosion, and in the supratrochlear cortical bone in one case.…”