I'm eventually going to need a new hip. So I've started looking on-line for different brands to talk to my doctor about. I found one I like the looks of called the Spotorno System.
The Spotorno System named for a town in Italy where it was developed has been on the European market since 1984. It is now available in the United States as well. It is a cementless implant.
Like all other hip implant systems, the CLS has two basic components: the acetabular cup (socket) and the femoral head and stem. The cup and stem are made of titanium. The femoral head is ceramic. There is a polyethylene (plastic) liner that goes inside the socket. The head of the femur fits into the liner. The liner or insert helps absorb impact on the implant so it must be as durable as possible.
This system has become a popular implant because of the good results achieved. According to a recent study done in The Netherlands, long-term results (10 to 15 years) are now available.
Most of the patients in this study had osteoarthritis of the hip but there were a few with rheumatoid arthritis (RA) or osteonecrosis (bone death from loss of blood supply to the bone). Everyone was 66 years old or younger.
Long-term results were measured by looking at hip motion, pain, walking ability, and X-rays to look at wear and tear on the implant and any underlying bone loss. Surgeons involved in the study also used type and number of complications, number of revisions, and overall survival of the implant as outcome measures.
In the final evaluation, there were 14 of the 102 patients who had a second surgery to revise the implant. Most had a loose cup without infection. Like other types of hip implant systems, the CementLess Spotorno System (CLS) had some problems with wearing of the polyethylene liner.
Analysis of the data showed that risk factors for implant failure (especially liner wear) in this group of patients included younger age at the time of surgery (more active), larger femoral head component part, smaller socket size, larger body-mass index (BMI), and male sex.
All implants did quite well during the first 10-years (first decade). Problems didn't start to develop until the second decade (years 11 through 20). The number of CLS hip implants that were still intact and working fine after the first ten years was 92 per cent. That's called the survival rate. Survival rate after 15 years was 78.4 per cent (good but not as good as the first decade). Survival rates past 15 years are not available yet.
How does the CementLess Spotorno System (CLS) stack up against other similar hip implant systems? The authors say, "very favorably." Survival rates, complication rates, and improvements in pain, motion, and function were all in the same ranges.
The biggest problem remains loosening of the cementless cup during the second decade of use. Knowing what some of the risk factors might be may help shape future patient selection and management approaches. More long-term studies following patients a full 20 years are also needed.
P. B. Witte, MD, BSc, R. et al. Mid-Term Results of Total Hip Arthroplasty with the CementLess Spotorno (CLS) System. In The Journal of Bone & Joint Surgery. July 6, 2011. Vol. 93-A. No. 13. Pp. 1249-1255.
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