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Besides periprosthetic joint infection, metal hypersensitivity should be considered when complaints persist after total joint arthroplasty. To date, there is no consensus on the diagnosis, and believers and non-believers of metal hypersensitivity exist. The pathogenesis of metal hypersensitivity is complex and involves a type-4 delayed hypersensitivity reaction with both a cutaneous and systemic response. It is unclear if complaints after total joint arthroplasty (after eliminating other causes) are caused by metal hypersensitivity. Furthermore, it is not known whether sensitization is a cause or a consequence of complaints after total joint arthroplasty. Currently, the patch test is the best screening test to diagnose metal hypersensitivity, but the accuracy has not been defined. We present a female patient with a painful left elbow three years after total elbow replacement. Because of the increasing volume of total joint prostheses, we aim to create awareness for metal hypersensitivity and the according diagnostic dilemmas.

Besides periprosthetic joint infection, metal hypersensitivity should be considered when complaints persist after total joint arthroplasty. To date, there is no consensus on the diagnosis, and believers and non-believers of metal hypersensitivity exist. The pathogenesis of metal hypersensitivity is complex and involves a type-4 delayed hypersensitivity reaction with both a cutaneous and systemic response. It is unclear if complaints after total joint arthroplasty (after eliminating other causes) are caused by metal hypersensitivity. Furthermore, it is not known whether sensitization is a cause or a consequence of complaints after total joint arthroplasty. Currently, the patch test is the best screening test to diagnose metal hypersensitivity, but the accuracy has not been defined. We present a female patient with a painful left elbow three years after total elbow replacement. Because of the increasing volume of total joint prostheses, we aim to create awareness for metal hypersensitivity and the according diagnostic dilemmas.

Posterior shoulder dislocation after a traumatic event is often underdiagnosed. Consequently, treatment is initiated too late and patients experience pain and loss of motion. Conventional X-ray is the standard to diagnose a posterior shoulder dislocation. If symptoms persist, a CT scan should be performed. We describe two patients with chronic posterior shoulder dislocation. Each patient received different treatment due to the duration of the posterior dislocation and the age of the patient. The purpose of this report is to highlight the importance of early recognition and diagnosis of a posterior shoulder dislocation, and the need for clinicians to consider this condition and treat it correctly.

A 31-year-old man presented with pain of the left shoulder after acute protraction of the shoulder with a forced abduction and exorotation during a survival run. Flexion and abduction were painful, as well as palpation at the medial side of the coracoid process. Isolated rupture of the minor pectoralis muscle was confirmed.