Mechlenburg, Inger, et al. “Patients Undergoing Shoulder Arthroplasty for Failed Nonoperative Treatment of Proximal Humerus Fracture Have Low Implant Survival and Low Patient-Reported Outcomes: 837 Cases from the Danish Shoulder Arthroplasty Registry”. Acta Orthopaedica, vol. 91, no. 3, Feb. 2020, pp. 319–325, doi:10.1080/17453674.2020.1730660.