HÄGGLUND, Gunnar; PETTERSSON, Holger. A case of bilateral duplication of the patella. Acta Orthopaedica, [S. l.], v. 60, n. 6, p. 725–727, 1989. DOI: 10.3109/17453678909149615. Disponível em: https://actaorthop.org/actao/article/view/22704. Acesso em: 20 may. 2026.