Challenges in Hip Replacement in Hip Dysplasia Cases and the "Happy Elephant Sign.

Hip dysplasia is an abnormal development of the hip that consists of a spectrum of different abnormalities featuring an abnormal relation of the femoral head to the acetabulum. It can be treated in early childhood when it is diagnosed. Later in adult life, it is more challenging. We present a case of a 50-year-old woman who presented to us with adult hip dysplastic changes; we undertook the care of her left hip and treated her surgically.

Intriguing Periprosthetic Fracture of Hip Stem and Proximal Femoral Replacement.

Lateral femoral prosthesis perforation is an uncommon periprosthetic fracture. Periprosthetic fractures may be fixed with open reduction and internal fixation, or with revision arthroplasty, depending on the type of fracture, the condition of the host bone in the proximal femur, the stability of the implant, and occasionally the medical co-morbidities of the patient. Proximal femoral replacement is a complex and challenging procedure but provides a better chance of early mobilisation. We describe a case of treating a 71-year-old woman who presented with an unusual type of periprosthetic fracture, treated with a revision arthroplasty procedure using a proximal femur replacement.