Biomedical Engineering Reference
In-Depth Information
65 patients representing 68 S.T.A.R. arthroplasties were reviewed for 2-6
years. No infection occurred, no patients died during the follow-up.
Early experience with the S.T.A.R. is encouraging, although more
complications have been encountered than previously reported [43].
Schernberg F: Current results of Ankle Arthroplasty - European Multi-
center Study of Cementless Ankle Arthroplasty
. Chapter 9, Current
Status of Ankle Arthroplasty, Berlin, Springer 1998, Kofoed H., ed.
131 STAR ankles were implanted in a multi-center study covering six
European sites. There were eight failures after 1-year and 5 failures after
2 years. No failures were seen after the 2-year follow-up mark. The good
results depended upon good patient selection and good technical
management of the procedure [44].
Kofoed H: Scandinavian Total Ankle Replacement (STAR).
Clinical
Orthop
424:73-79, 2004.
58 patients with either rheumatoid arthritis or osteoarthritis were
implanted with the STAR meniscal bearing ankle. Cement was used for
33 patients and Cementless for 25 and the mean follow up was 9.4 years.
In the cemented group 9 patients failed and were revised or fused. In the
cementless group 1 patient had revision surgery. Survivorship based on
life tables showed a 70% survival rate at 12 years and 95.4% for the
cementless group. Average clinical scores at the latest follow up were
74.2 ± 19.3 and 91.9 ± 7.4 respectively.
The authors concluded that 'unconstrained meniscal-bearing ankle
prostheses should be uncemented' [45].
Kofoed H: Ankle Arthroplasty: Indications, Alignment, Stability and
Gain in Mobility: Chapter 4,
Current Status of Ankle Arthroplasty,
Berlin,
Springer 1998, Kofoed H., ed.
76 STAR devices were implanted. 44 had osteoarthrosis, 22 had
rheumatoid arthritis, 4 talar necrosis, 4 psoriatic arthritis, and a
conversion of a previous fusion. Five failed of the OA, RA diagnoses and
all four of the AVN sufferers. Yet, despite the failures the current results
are competitive with the best results of arthrodesis, without contracting
secondary sub-talar problems.
The author concluded that for good and lasting results, alignment
and stability are mandatory, a concept shared by Queen et al [46].
The early designs were too constrained to give stability resulting in a
