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In the present report the authors describe four cases with megacolon and arthritis. The etiology of these unique associations is known in only one case. The musculoskeletal pictures belong to the group of seronegative spondyloarthritis. A huge resistance with great scibalas was detected in the left iliac region by physical examination in all cases. Surgical procedures of the colon resulted in complete remission of arthritis in one case, in the others, chronic obstipation with intermittent relapse of arthritis persisted.

This article reviews the most common forms of primary immunodeficiencies with articular involvement: X-linked (Bruton's) agammaglobulinaemia, common variable immune deficiency and selective IgA deficiency. The most commonly observed types of arthritis in these disorders are benign, aseptic, characteristically non-erosive polyarthritis and infective arthritis caused by Mycoplasmas or Ureaplasmas. The authors present the case of a patient with immunodeficiency whose polyarthritis was found to be unusually severe and destructive.

This paper reports on the global results of the low contact stress knee prosthesis system with mobile weight bearing surfaces. The follow-up result of 918 cemented and 963 cementless knee prostheses was in more than 90 per cent excellent and good 2-8 years after the operation. The ratio of complications connected with the construction decreased to 2.8 per cent in cementless prostheses. In the cemented series less variations of size were available and the problems with the tibial component were under 2, the complications with the patella remained under 1 per cent. The more than 12 years clinical use of the mobile weight bearing knee prosthesis system proved the success of the solution concerning the basic construction.

Authors report on the first use of bicondylar surface substitution knee prosthesis of a new type. The prosthesis and the instruments developed for implantation are demonstrated. In the first five operations the appropriateness of the implantation instruments, the exactness of their handling, the assortment of the series of prosthesis have met the plus which, compared to the types known until now, can secure the exactness of the operation and improve the ratio of the lasting good results.

In the operative treatment of the knee diseases Guepar prosthesis was used formerly more frequently, presently however only rarely. The frequence of complications and their treatment are many times serious problems. Authors describe one case in which the postoperative supracondylaer fracture necessitated the insertion of a special knee prosthesis.