A modular femoral implant for uncemented stem revision in THR.

We present the early results of 142 uncemented femoral stem revisions using the modular MRP-Titan system. There were 70 cases with marked preoperative femoral bone defects (Paprosky type 2C and type 3); and bone grafts were used in 31 cases. At a mean follow-up of 2.

[Possibilities for rehabilitation in spinal injuries with or without neurological deficit].

Generally spine injured persons without neurological deficits can--as long as the principles of industrial medicine are observed--be occupationally integrated without any particular rehabilitation measures within the limits of their remaining capacity. Spine injured persons, however, with remaining instabilities, serious static deficiencies and/or neurological deficits need further rehabilitation after their in-patient and immediate posthospital treatment. Spinal cord injured patients usually have to accept serious changes and limitation in all spheres of life.

[Interchangeability of the ceramic ball heads of various endoprosthesis systems. Technical report].

Today, the type of hip joint prosthesis implanted is usually chosen on the basis of the patient's age and anatomic conditions, and in particular depending on whether it is a first or second hip replacement. Not infrequently, it is desirable or necessary to combine different prosthesis systems, especially when changing prostheses. In many cases this is possible.

[Late results of subcapital linear osteotomy in epiphysiolysis capitis femoris juvenilis (author's transl)].

107 patients with separation of the head of the femoral epiphysis were treated surgically at the Marburg Orthopaedic University Hospital during the 1955--1975 period. Followup examinations were performed in 69 patients. 34 of these had been subjected to subcapital linear osteotomy.

Investigations with bioactivated polymethylmethacrylates.

Compound bone cement on a PMMA base with an additive of bioactive glass ceramic particles in different portions and different particle sizes are tested in animal experiments. The tissue reactions to extracorporal polymerized specimens and to in situ polymerized specimens are observed. The experiments with an implantation period up to six months demonstrate a tight bonding between the newly formed osseous tissue and the glass ceramic particles at the interface.

Compatibility and long-term stability of glass-ceramic implants.

The biocompatible and bioactive glass-ceramic material Ceravital, which has been developed, can be adapted to the physiological conditions of the organs by apropriately monitoring its chemical composition. The material exhibits a remarkable long-term stability in in vitro solubility tests and when used as implants in animal experiments.

[Study on the use of glass ceramics in osteo-odonto-keratoplasty].

Report of preparatory investigations about the usefulness of 'glass ceramics' in keratoplasty in a modification of Strampelli's method: Under the available implantation materials, glass ceramics seem to be the best as they join strongly to the bone and to interstitial tissues. As glass ceramics are suitable to keratoplasty, the necessity of loosing a tooth in osteo-odonto-keratoprosthesis after Strampelli can be avoided. Other advantages are standardization of the whole procedure, shortening of operation time and extension of indications for the operation.

[Restitution of lunate bone necrosis in a child (author's transl)].

We reported a case of aseptic bone-cartilage necrosis of the os lunatum in a child. All indications for constitutional disposition, anatomic variations in the wrist joint or a traumatizing of the wrist joint were absent. Etiologically, a disturbance in vascularization could be assumed.

Effect of pulverized implantation materials (plastic and glass ceramic) on growth and metabolism of mammalian cell cultures.

The effect of pulverized plastic and glass-ceramic materials (methylmetacrylate, MNA), which are used as implantation materials in surgical medicine, on cell growth, DNA synthesis rate (adjudged by incorporation of 3H-thymidine into DNA), glucose consumption and lactate production (glycolytic rate) was studied in asynchronous monolayer cultures of rather fast proliferating Ehrlich ascites tumor cells and rather slowly proliferating diploid human fibroblasts. Exposure of Ehrlich ascites cells to high concentrations (2 mg/ml; 10 ml medium per culture) of ceramic or plastic material resulted in a gradual inhibition of cell growth and DNA synthesis rate. Protein synthesis, as measured by the incorporation of 3H-leucine, was somewhat less affected than DNA synthesis.

[Studies on soft tissue reactions to implantation of glass ceramics (author's transl)].

This report describes the implantation of glass and glass-ceramics into soft tissues. These experiments revealed that our new glass and glass-ceramic materials are well compatible with soft tissues. The fibrous membrane surrounding such an implantat consists of normal dense collageneous connective tissue.