patella, gen and pl. patellae (pa-tel´a, -e) [NA]

The large sesamoid bone, in the combined tendon of the extensors of the leg, covering the anterior surface of the knee.kneecap; [L. a small plate, the kneecap, dim. of patina, a shallow disk, fr. pateo, to lie open]
floating p. a p. riding high on effusion of the knee.
slipping p. spontaneous or easily provoked dislocation of the p.


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