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Biomedical subjects

J Röttger

Publications and source records attributed to J Röttger.

12 recordsLinked to original sources
PubMed1986

A modification of Charnley low-friction arthroplasty. Representative ten-year follow-up results of the St. Georg prosthesis.

From the stimulus offered by John Charnley in 1962, Hans Wilhelm Buchholz developed the St. Georg hip implant in Hamburg. The design differed from that of Charnley notably in the size of the femoral head. The results of early operations performed in Hamburg are confined largely to the most cogent form of failure, mechanical loosening of one or both components. Four representative years (1968-1971) were selected for this purpose, and survival curves were constructed for 1971 patients of different age and preoperative diagnosis. In conventional terms, the rate of mechanical loosening for the femoral component is 1.9%, for the acetabular component 2.4%, and for both components 7.5% for a ten or more year follow-up period. The principle annunciated by Charnley suggesting that total joint arthroplasty be performed in large units or special hospitals is strongly recommended.

Adolescent↗
PubMed1981

Management of deep infection of total hip replacement.

Exchange operation is recommended as the treatment of choice for most deep infections involving a total hip replacement. This revision arthroplasty comprises, in one stage, excision of soft tissue, removal of implant and cement, replacement with an appropriate implant using Palacos R acrylic cement loaded with an appropriate antibiotic and, more recently, systemic antibiotics. During our first 10 years without systemic antibiotics we have achieved an overall 77 per cent success rate from a first attempt in 583 patients and a 90 per cent success rate after subsequent exchange procedures. Morbidity is significant but acceptable. Success is defined as control of infection, no loosening, and useful function. The factors associated with failures include, in particular, specific infections (Pseudomonas group, Streptococcus group D, Proteus group, and Escherichia coli), delay in operation and inadequate antibiotic dosage in the cement.

Anti-Bacterial Agents↗
PubMed1980

[Experiences with the use of shoulder joint endoprosthesis].

Total shoulder replacement has been successful as treatment for patients with irreparably damaged and painful glenohumeral joints, though improvement of joint motion is limited. Our experiences with 101 alloplastic operations on the human shoulder are reported for further design and construction of total shoulder joint prostheses. The type of prosthesis chosen depends on the degree of joint damage. A dorsal approach is recommended, carefully preserving or restoring function of the musculo-tendinous cuff mechanism.

Adult↗
PubMed1976

[Partial replacement of the humerus].

Based on twelve cases, this paper reviews the possibilities of partial replacement of the humerus. In 6 cases an interpolation was successfully performed replacing a resected part of the humeral shaft while maintaining the shoulder and elbow joint. The interpolated material is polyethylene, centrally reinforced by metal. A resection of up to 17 cm was performed. The longest period of observation is more than 2 years. This operative procedure is preferred to the methods so far used in cases of extensive destruction of the humeral shaft. Primarily, osteolyses are an indication for this type of operation.

Adult↗
PubMedDate not supplied

[St. Georg knee endoprosthesis system (slide and hinge principle). Observations and results following 10 years' experience with over 3,700 operations].

Some 2000 total knee endoprostheses were inserted from 1970-1978 and about 1700 of these have been followed two different types of knee replacement were used, a surface replacement of a non-constrained design and a total hinge prosthesis. Serious complications, such as infection, loosening and fracture of the components were regarded as significant determinants in the evaluation of the durability of total and partial knee replacement. The highest and lowest incidence of complication were recorded. The longevity of knee arthroplasty and the survival rates were estimated by constructing survivorship tables. Patients with knee replacement having no complications were designated "survivals" while patients with an established complication were treated as "deaths". The success rates of total hinge prosthesis were compared with those of the sledge prosthesis. Failure rates of aseptic complications were assessed and compared with failure rates due to septic complications. A differentiation was also made between the sledge prosthesis and the total hinge prosthesis. Furthermore, significant differences in the indication for the insertion of the sledge or the total hinge were determined by group assessment (log-rank-test). Unlike the general trend to use a semiconstrained knee replacement the evaluation of this clinical trial has induced us to improve our hitherto used total knee prosthesis model rather than to develop a new surface replacement.

Follow-Up Studies↗