Biomedical subjects

K H Täger

Publications and source records attributed to K H Täger.

At least 19 recordsLinked to original sources

PubMed1994

[Bone defects as complication following total hip endoprosthesis implant].

The authors present a relatively short followup study of 129 patients who were treated with cementless revision for loosened previous arthroplasties. Elderly patients with a first revision and good bone stock condition were excluded as were septic failures. All patients were treated with cementless, hollow-designed implants. Following previous THA and, also repeated revisions--nearly all of them using a cemented technique--many of the patients developed mostly acetabular, but also femoral loss of bone stock of various quality. Many of these cases required extensive allogenic bone grafting; some of the cases with severe loss of bone stock in young patients necessitated two-stage surgery. Despite this high rate of allografts, no infection occurred. Five patients were revised again for loosening or for femoral fracture; two patients showed sinking of the femoral component and clinical deterioration. The possibilities and advantages of restoration of the implant bed in destructive, aseptic loosening with demanding bone graft and cementless techniques are encouraged by the early results of the patients remobilization and radiologically recognizable revitalization of bone stock. Long-term follow-up will be necessary to evaluate allograft incorporation exactly.

Acetabulum↗

PubMed1993

The new spongiosa-hip-joint-endoprosthesis (SHEP).

The new endoprosthesis system SHEP (Spongiosa Hip Endo-Prosthesis) developed by the author and manufactured by Howmedica has been in clinical use since October 1987. This system comprises a hollow-stem prosthesis with a microporous surface and a straight, collarless stem with circular and oval perforations in the anterior and posterior surfaces. The conical threaded acetabular component is doublewalled. In primary operations endogenous spongiosa is packed into the spaces in the acetabulum and the cavity of the stem, and in exchange procedures the spaces are packed with homologous spongiosa preserved under cold storage. The prosthetic components are implanted cement-free. The system is indicated in all forms of osteoarthritis of the hip. To date more than 360 SHEPs have been implanted by the author and at other clinics, 1/3 of which were exchange prostheses. The biomechanical properties of the prosthesis have undergone endurance tests and far exceed the statutory values. The SHEP system is made of Vitallium, the inlay is polyethylene, and the head is ceramic. Scintiscans initially show raised counting rate quotients compared with the healthy side. Video film reveals impressive bony regeneration and peg-shaped bony bridges between the inner cortical bone and the prosthesis. Microscopic examination shows lamellar bone, rich in osteocytes and osteoblasts. Microscopic investigation of samples from inside the prosthesis (after 5, 9 and 12 months) shows transformation of foreign spongiosa and substitution by endogenous spongiosa or spongy bone with lamellar stratification and good microvascularization.

Adult↗

PubMed1977

[The problem of acetabular loosening in patients with total hip joint replacement (author's transl)].

Recently aseptic loosining of the acetabular part in patients with allo-arthroplasty has also become a numerically increasing problem. Different opinions exist regarding the etiology, they range from mechanical to tissue factors. Favourable personal experience with careful handling of the bony acetabulum during surgery appeares to confirm that the size and type of treatment of the acetabular wound during implantation of the acetabular prosthesis are significant factors for the durability of the allo-arthroplasty. A formula which was compiled indicates and clearly shows how the increase in area of the acetabular wound depends on the increase of the acetabular radius. In addition, the laws of cellular reaction from general pathology should be the reason to limit damage to living tissue to the absolutly necessary extent.

Acetabulum↗

PubMed1976

[Studies on the surface and new joint capsule of McKee-Farrar prosthesis implanted for several years (author's transl)].

These studies are intended as a critical contribution to the question, wether the McKee-Farrar (MF) prosthesis, on account of its stronger friction and the consequences of this, as compared to other models, still has its justification or wether these "secundary" manifestations indicate that this prosthesis should be abandoned. Studies on primary and secundary alteration of the surface were carried out on exchanged MF prosthesis with the aid of the grid electron microscope. The signs of wear are clearly visible and can be differenciated from production artefacts. The movement and deposit of abraded particles into the new joint capsule was studied qualitatively and quantitatively with the aid of radioisotopes. All samples showed an increased accumulation of chrome in the tissues as compared to cobalt. There is no indication of significant damage. On the basis of the results of these studies and on account of the favourable personal experience from a surgical and clinical point of view -- particulary with reference to minimal preparation of the acetabulum and ready replacement, the MF prosthesis will continue to hold its place as the standard model for total prosthetic hip joint replacement.

Aged↗

PubMed1975

[The use of electrodynamic alternating potential in operative and conservative orthopedics (author's transl)].

W. Kraus and F. Lechner's electromagnetic field coil was used in 107 patients for operative (82) and conservative (25) indications. The method was shown to be a valuable addition to the therapeutic possibilities so far available for bones and joints. The production of new bone is estimated, blood flow through the soft parts is promoted and affects the inhibition of inflammation. No additional demands are made on the surgical technique and side effects do not occur. The results of treatment are substantiated by X-ray pictures and the indications listed individually.

Adolescent↗

PubMed1975

[Focal lipodystrophy in the bone marrow].

Small areas of slowly progressive disseminated osteolytic disease of unknown clinical, radiological and biochemical aertiology developed over three years in a 59-year-old man with exercise-induced pain in the left leg as the only symptom. Several bone biopsies merely revealed circumscribed primary dystrophy of the univacuolar medullary fat tissue with destruction and new formation of bone. The process, which is restricted to fat tissue of the bone marrow, has been termed "focal liposystrophy". It was also found in a briefly described second case. The pathogenesis is largely identical with comparable changes in extra-osseous fatty tissue which are also of unknown aetiology and usually termed "idiopathic".

Adipose Tissue↗

PubMed1975