JOURNAL ARTICLE

Radiostereometric analysis of the double-coated STAR total ankle prosthesis: a 3-5 year follow-up of 5 cases with rheumatoid arthritis and 5 cases with osteoarthrosis

Ake Carlsson, Patrik Markusson, Martin Sundberg
Acta Orthopaedica 2005, 76 (4): 573-9
16195076

BACKGROUND: The designs of total ankle prostheses have changed in recent years in order to give better performance. Only a few studies of these ankle prostheses have been published, however, and none on micromotion.

PATIENTS AND METHODS: We evaluated 5 patients with rheumatoid arthritis and 5 with osteoarthrosis, 4 (3-5) years after arthroplasty with the double-coated STAR prosthesis. Clinical examination included AOFAS hindfoot score. Standardized a-p and lateral radiographs were taken and RSA analyses were done at regular intervals.

RESULTS: There was no difference in results between ankles operated on due to rheumatoid arthritis and due to osteoarthrosis. A rapid initial migration was observed for the tibial components at 6 weeks, but thereafter all but 1 implant seemed stable. The migration pattern for the talar component was similar. Rotation around the 3 axes was observed for the tibial components at 6 weeks, but not thereafter. The talar components became stable for rotation around the longitudinal and sagittal axes, but not around the transverse axis. 8 out of 10 ankles were painless. The median total AOFAS score was 83 and the median range of motion was 32 degrees. None of the 20 components had changed position and there were no signs of bone resorption.

INTERPRETATION: Provided the indication is adequate and the prosthesis has been implanted correctly, the double-coated STAR ankle prosthesis will have a satisfactory fixation to underlying bone.

Full Text Links

Find Full Text Links for this Article

Discussion

You are not logged in. Sign Up or Log In to join the discussion.

Related Papers

Remove bar
Read by QxMD icon Read
16195076
×

Save your favorite articles in one place with a free QxMD account.

×

Search Tips

Use Boolean operators: AND/OR

diabetic AND foot
diabetes OR diabetic

Exclude a word using the 'minus' sign

Virchow -triad

Use Parentheses

water AND (cup OR glass)

Add an asterisk (*) at end of a word to include word stems

Neuro* will search for Neurology, Neuroscientist, Neurological, and so on

Use quotes to search for an exact phrase

"primary prevention of cancer"
(heart or cardiac or cardio*) AND arrest -"American Heart Association"