Magazine for Endoprosthetics, Special Anniversary Issue / Years of SPII

Transcription

1 Magazine for Endoprosthetics, Special Anniversary Issue / Years of SPII A success story

2 The Invention of the Anatomical Femoral Stem The cemented SPII Model Lubinus hip system has been implanted in around 500,000 cases to date. Its success story begins as far back as the seventies, when Link raised the bar for fi xation stability of hip implants by developing the biomechanical concept. The SPI one of the most important innovations in the history of hip arthroplasty first came on the market in 1978 to an initially lukewarm reception from some quarters of the medical world. Some doctors took the view that an anatomically shaped femoral stem could only be explanted with great difficulty, if at all a theory we managed to disprove, recalls Dr. Hans-Herrmann Lubinus, who headed up the Lubinus Clinicum in Kiel between 1969 and 2003 and who developed the SPI and its successor, the SPII, in collaboration with Link. This was not the only reason why the critical voices soon fell silent: the progress which the invention of the first anatomical femoral stem in implantology represented was simply too significant to ignore. SPII stem and Lubinus acetabular cup Proprietor Helmut D. Link and the SPI, which was developed in It came on the market as a onepiece prosthesis with an anatomical stem Its curved shape makes for a uniform cement mantle around the SPII stem

3 SPII femoral stem: The advantages at a glance Anatomical shape enables the stem to be centered in the femoral canal Uniform cement mantle all around the stem Curved shape of the stem resists rotational forces Large collar support reintroduces physiological forces into the femur Built-in physiological anteversion Simple, reproducible implantation technique Modular system means it can be tailored to the patient s anatomy: - Two standard and four additional stem lengths of 200 to 350 mm for revisions - Three CCD angles, one extra-long neck and up to four head-neck lengths for exact lateralization Writing the next chapter in the success story The SPII has been instrumental in establishing the reputation of the Lubinus Clinicum in the world of implantology, and I am delighted to have been involved in the development of an implant which has enjoyed such sustained success, sums up Dr. Hans-Hermann Lubinus. His son, Dr. Philipp Lubinus, is convinced that the success story of the femoral stem is far from over. The SPII stem s excellent longterm results for example, in the Swedish Hip Arthroplasty Register provide a springboard for the implant s continued expansion, says the Head of Implantology at the Lubinus Clinicum. Patients all over the world will surely be happy with this prognosis. Dr. Philipp Lubinus, Head of Implantology at the Lubinus Clinicum in Kiel and a firm supporter of the SPII The SPII stem s excellent long-term results provide a springboard for the implant s continued expansion. Dr. Philipp Lubinus

4 The introduction of different CCD angles is one of the most important advances in the SPII system Perfect fit Link s development of the biomechanical concept meant that the company could offer an alternative for hip arthroplasty which was superior in many respects to the straight-stem prostheses then typically available. The SPII was the first design to take into consideration the fact that the proximal femoral canal is S-shaped, something which had been disregarded in the design of earlier femoral stems. Once the stem conformed to the anatomy of the bone, not only did we almost neutralize rotational forces but we also achieved uniform load distribution, which drastically improved fixation stability, explains Helmut D. Link. Another advantage of the anatomical stem over a straight model is that it enables the implantation of thicker stems. What is more, the stem is surrounded by a uniform cement mantle, which further reduces the risk of loosening compared with straight stems. Important advances While the SPI was a great success in the early years, the biomechanical concept did not make a real breakthrough until This is when Link replaced the SPI onepiece prosthesis with the SPII Model Lubinus, a modular system with femoral heads and acetabular cups of different sizes. It was finally possible to optimally adapt the hip prosthesis to fit the patient s unique anatomy during the operation. With that, the SPII, as the world s first modular hip system with an anatomical femoral component, was unstoppable. Almost 500,000 patients worldwide have had successful joint replacement surgery thanks to the SPII. In addition, national and international competitors applied to Link in numbers for a licence to use the patent and enable them to produce their own anatomical stems, with the result that a great many more patients benefit from the invention. The SPII has been further developed over the years and brought in line with the latest findings in implantology. Indeed the introduction of different CCD angles and increased modularity were important steps for the prosthesis to be capable of adapting to the unique biomechanical needs of each individual patient with even greater flexibility. Other advances include combining it with the Beta Cup acetabular cup system and the development of an anti-allergic coating. The basic principle of the anatomical stem, however, has remained unchanged to this day. Dr. Hans-Hermann Lubinus is one of the fathers of the SPII, which has been available as a modular system since 1984

5 In a Word, Excellent For years, the SPII Model Lubinus has had a track record of excellent long-term results in the Swedish Annual Hip Report: proof positive of the outstanding performance of the anatomical hip stem. The figures speak for themselves: according to the latest edition (2007) of the Swedish Annual Hip Report*, the SPII Model Lubinus has a survival rate of 94.7% after 16 years, based on 60,949 cases across a large number of different centres. Once again, the Link classic has demonstrated that the concept of a cemented total hip replacement with an anatomical femoral stem is one of the most important achievements ever in hip arthroplasty. The Swedish Hip Arthroplasty Register testifies in black and white to the long success story of the SPII hip stem. In addition, in Sweden the implant is among the cemented hip stems with the lowest risk of revisions, loosening and periprosthetic fractures, says Professor Johan Kärrholm from the Department of Orthopedics of Sahlgrenska University Hospital in Mölndal, who is one of the authors of the report. Study provides compelling evidence Recording a large number of implantations and covering a wide spectrum of surgeons, the Swedish Hip Arthroplasty Register shows as almost no other study does what long-term results a patient can expect after a hip implantation. For a great many surgeons, therefore, the SPII s results in the Swedish Annual Hip Report were what prompted them to use the implant in their clinic. Professor Kärrholm is a firm supporter of the SPII. Back in the eighties I worked with the SPII hip stem in the orthopedic clinic in Umeå, he says. And since 2006, the cemented stem has been in routine use at Sahlgrenska University Hospital. *The Swedish Hip Arthroplasty Register: Annual Report Published online at: Professor Johan Kärrholm from the Department of Orthopedics at Sahlgrenska University Hospital in Mölndal, Sweden, is one of the authors of the Swedish Annual Hip Report 2007 Publication details Publisher: Waldemar Link GmbH & Co. KG Helmut D. Link Editing (responsible): Heike Urbschat, Tel.: , redaktiondirectlink@linkhh.de Realization/Production/ Photos: LINK Hamburg Print: Nehr Offsetdruck Media Hamburg WALDEMAR LINK GmbH & Co. KG Barkhausenweg 10 D Hamburg, Germany Tel.: Fax: redaktiondirectlink@linkhh.de

6 Congratulations from All Corners of the World On this, the 25th anniversary of the SPII Model Lubinus, users from home and abroad share their experiences with the implant and explain what it is they particularly like about the SPII. Prof. Dr. Martin Krismer, Dept. of Orthopedics, Medical University of Innsbruck, Austria: The large collar, which helps with prosthesis seating while compressing the cement, is one of the SPII s special features. Despite its anatomical form, it can be explanted without diffi culty in revision cases. Prof. Dr. Klaus-Peter Günther, Clinic and Polyclinic for Orthopedics at University Hospital Dresden, Germany: The SPII is sure to deliver a very good, very safe replacement for patients who, because of their age, are not suitable candidates for cementless total hip replacement. Antero Hänninen, Central Hospital of Kainuu, Kajaani, Finland: We have been using the cemented Link prosthesis since In our hospital in Kajaani, we have done over 1,100 primary SPII and during the last three years SPII has been the main fracture prosthesis, too. Our results with SPII are excellent. Tim Dougall, Woodend Hospital, Aberdeen, Scotland: I would recommend the SPII to any hip surgeon looking for a great cemented femoral component that is versatile, user friendly and has an unsurpassed track record of results in the Swedish Hip Register. Jorge Blacutt, Hospital San Vicente de Paul, Cochabamba, Bolivia: The anatomic shape of the stem allows for a neutral position and resists rotational force with secure implantations. Dr. Julien Girard, Centre Hospitalier Régional Universitaire de Lille, France: A special feature of the SPII is that it facilitates the implantation of a stem with a very small CCD angle (117 ), which is extremely expedient in many cases. Li Yu-jun, Beijing Jishuitan Hospital, Beijing, China: Up to now, the survival rate of the SPII stem in our follow-up studies is 100 percent. So we believe that the stem is a very good option in total hip arthroplasty. Dr. Paul Fuglesang, Levanger Hospital, Norway: The good instrumentation is a great advantage of the SPII. This makes it very easy to implant the stem in a standardized matter, which is especially important when teaching our residents hip arthroplasty surgery. Another advantage is the anatomical shape that gives a relatively uniform cement mantle.