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 significance1, 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