Wingstrand, H., Strömqvist, B., Egund, N., Gustafson, T., Nilsson, L. T., & Thorngren, K.-G. (1986). Hemarthrosis in undisplaced cervical fractures: Tamponade may cause reversible femoral head ischemia. Acta Orthopaedica, 57(4), 305–308. https://doi.org/10.3109/17453678608994397