Fleischhacker, Evi; Sprecher, Christoph; Milz, Stefan; Gleich, Johannes; Siebenbürger, Georg; Helfen, Tobias; Böcker, Wolfgang; Ockert, Ben (2022): Functional outcomes before and after implant removal in patients with posttraumatic shoulder stiffness and healed proximal humerus fractures: does implant material (PEEK vs. titanium) have an impact? – a pilot study. BMC Musculosceletal Disorders (23): 95. ISSN 1471-2474