Metal Hip Replacement And Mri

Although orthopaedic and dental implants are metal they are not magnetic ferrous.

Metal hip replacement and mri.

Osteolysis and extracapsular disease are uncommon. Dental fillings and bridges. Listing a study does not mean it has been evaluated by the u s. The mri signs most suggestive of aseptic lymphocytic vasculitis associated lesions are high volumes.

In patients with metal on metal hip arthroplasty diagnostic imaging studies ultrasound and mri show the incidence of asymptomatic pseudotumors at the level of 27 32 6. Artificial joints such as those used for a hip replacement or knee replacement. Some tattoo ink contains traces of metal but most tattoos are safe in an mri scanner. The mri examinations of patients with metal on metal hip prostheses placed at resurfacing arthroplasty n 31 or tha n 29 were reviewed for osteolysis synovitis extracapsular disease synovial pattern and mode of decompression into adjacent bursae.

In the present study we used metal artifact reduction sequence magnetic resonance imaging mars mri to investigate the cases of 53 patients 66 hips with a small head 28 mm metal on metal total hip replacement and elevated blood ion levels at a mean follow up interval of 15 5 years range 10 6 to 19 3 years. While non ferrous surgical metal can distort an mri image most are safe within the strong magnetic field of an mri machine provided it s been at least 6 weeks since the surgery. These include hip and knee replacements plates screws and rods to treat limb fractures and dental fillings. Mri is further beneficial for imaging as it does not expose the patient to ionizing radiation.

Axial intermediate weighted fast se mr images of metal on metal hip arthroplasty systems with adverse local tissue reactions caused by hypersensitivity to metal products in four patients show the mr imaging spectrum. The incidence of symptomatic pseudotumors following metal on metal hip arthroplasty is approximately 5. Surgical clips or staples used to close wounds after an operation. A mr image 5440 26 of a 73 year old man shows expansion of the pseudocapsule with homogeneous high signal intensity fluid and a thin hypointense synovial lining black arrow with no or few foci of synovial debris white arrow.

An appropriately performed mr examination provides the necessary information that allows the doctor and patient to determine potential treatment options that could possibly prolong the life of the replacement hardware and potentially avoid surgical revision or replacement of the existing arthroplasty.