Complications and Imaging: Mark I

Nieder et al.¹² found a 20% rate of deep infection in the 76 cases that he performed for failed arthroplasty (not tumors) with the Mark I model.

They saw upward migration in ALL cases although the migration soon stabilized and was referred to as 'bedding in'
Sclerosis at interface is common, and that if no sclerosis is noted then there is usually greater migration
Deep infection caused significant migration
Heterotopic bone around prosthesis is common and may or may not be of clinical significance^{1, 3, 6, 11}

Notice the cephalad migration and heterotopic bone formation over a 4-year period in this patient.¹²

Same patient as above. Close-up view.¹²

Another example of migration with the Mark I model over the course of a few years.¹²