Final answer:
A common concomitant injury with a hip dislocation is a fracture of the femoral neck, leading to potential necrosis and requiring surgical treatment.
Step-by-step explanation:
The most common concomitant injury with hip dislocation is a fracture of the femoral neck. The hip joint is prone to injury, and in elderly individuals particularly in those with osteoporosis a 'broken hip' typically refers to such a fracture. It often results from a fall and can simultaneously cause one. A fracture within the capsule of the hip joint can have serious consequences including disruption of blood supply leading to necrosis of the femoral head and neck resulting in bone and cartilage death. Following a fracture surgical treatment is usually required and the patient will need substantial mobility assistance thereafter.
The healthcare costs associated with these injuries are significant and there is also an increased risk of morbidity and mortality due to potential complications such as pneumonia, pressure ulcers and thrombophlebitis which may lead to a pulmonary embolism.