Ten-year follow-up of a bicondylar unlinked knee endoprosthesis with particular reference to mid-term results

Abstract

This analysis, submitted retrospectively, evaluates 603 PCA-type or Duracon-type knee endoprostheses implanted in 527 patients over a 10-year period. In addition, the X-rays available in a group of 138 patients (100 women and 38 men) from the entire patient population were analysed. All of these 138 patients were invited to come in for a follow-up examination. The invitation was accepted by 80 patients. As well as radiological and physical examination, these patients were asked about their subjective physical condition in a semi-open questionnaire. The data obtained by the questionnaire is discussed in the Results section. The average age of the 397 women, of whom 61 were operated on in both knees, and 130 men, of whom 15 were operated on in both knees, was 68 years at the time of the operation. The 76 bilateral patients had the knee endoprostheses implanted within a mean interval of 17 months. The most frequent indications for surgery were primary and secondary gonarthrosis, followed by rheumatoid arthritis. The evaluation of the X-rays from the above population of 138 patients revealed no radiological signs of loosening. No correlation between the time after implantation and the formation of radiolucent margins could be established. Those knee endoprostheses which were implanted with a varus deviation of more than 10 degrees did not yield a poorer result than those implanted perpendicular. In comparison with the cemented implants, the cementless implants produced slightly better results.

Long-Term Survivorship and Clinical Outcomes Following Total Knee Arthroplasty

“…The authors determined that the Duracon prosthesis had a survivorship rate of 90% after a 6-year follow-up (95% CI, 81%-99%). Similarly, other studies have reported high survival rates of 97%-99% and 96%-98.6% for a short-term and mid-term follow-up in Duracon TKA patients [7,8,[10][11][12].…”

Modular Uncemented Tricompartmental Total Knee Arthroplasty

“…Other authors have confirmed the superiority of a cementless implantation technique. Apart from better functional results, less polyethylene abrasion due to delamination is seen and the durability of the TKA is improved with a lower rate of aseptic loosening [10,11,49]. Furthermore, a cementless implantation technique provides better conditions for anchorage of the endoprosthesis, if revision surgery becomes necessary [17,50,51].…”

“…By contrast, TKA is only indicated in 12% of cases of posttraumatic osteoarthrosis (POA) in Germany [6]. In published retrospective studies, this percentage is between 0% and 6% [2,[7][8][9][10][11][12][13][14][15][16][17]. Changes in leisure activities undertaken by younger patients and the increasing popularity of sports that carry a high risk of injury have led to an increase in the incidence of POA [18,19].…”

Long-term survival and radiological results of the Duracon™ total knee arthroplasty

“…Only few studies on early (two to five years [12, 21, 29]) and mid-term (five to ten years [10, 13, 15]) survival results for the Duracon TKA have been published with survival rates between 97 and 99 % and 96–98.6 %, respectively. Long-term survival data is available mainly from the Scandinavian Knee Arthroplasty Registers [11, 24, 26].…”