Biomedical subjects

C Helmreich

Publications and source records attributed to C Helmreich.

5 recordsLinked to original sources

PubMed1994

[Long-term results of implantation of polyethylene screw sockets using Edler's method].

High-molecular polyethylene is used in many technical spheres and in orthopaedics it is used in particular as a sliding component. In orthopaedic endoprosthetics it serves as a material for the manufacture of sockets, whereby polyethylene sockets can be anchored with our without cement. Morphological research corroborates the suspicion of inadequate static firmness of the polyethylene used and this may lead to abrasion and thus mechanical loosening of Endler's screw socket and subsequently also of the metal shank. At the orthopaedic department of the General hospital in Zwettel (Austria) between 1984 and 1987 113 Endler sockets were implanted in 101 patients. So far 41 reoperations were made in 39 patients. In 71% of the patients replacement by a non-cemented socket according to Zweymüller followed, in 17% by a cemented socket according to Müller. In 4 joints at the same time also the femoral component had to be replaced, in 13 shanks bone rarefaction in the area of the calcar femoris was detected. In shanks with removable heads the head was always replaced. Clinical evaluation of the operated patients was done according to the procedure of Merle d'Aubigné.

Austria↗

PubMed1994

[Retrospective study of heterotopic ossification with and without prophylactic indomethacin therapy].

The authors evaluate the problem of heterotopic ossifications as a complication of total endoprostheses of the hip joint. The classification into stages as elaborated by Arcque was used and compared with the clinical correlate. The authors compared the year 1989 when the total number of prostheses was 150 without prophylaxis of ossifications, with the year 1992 when the total number of endoprostheses was 200 with prophylaxis. In 94% of the patients starting on the second day after surgery to the 21st postoperative day 2 x 50 mg Indomethacin (2 x 1 capsule Indocin forte) were administered. As a gastroprotective drug the patients were given Ranitidine, 2 x 150 mg (2 x film tablets Zantac 150). Complications such as gastrointestinal complaints and skin exanthemas were observed only in 6 patients. Prophylaxis of thromboembolic disease was used in 1992 in 65% of the patients by anticoagulants and in 35% of the patients by administration of low-molecular heparin. This procedure proved a very simple, effective and safe method for prevention of para-articular ossifications: [table: see text]

Female↗

PubMed1993

[Complications after replacement of a knee joint endoprosthesis with a cementless "low contact stress" prosthesis].

Total endoprosthesis of the knee joint of the LCS type reduce due to the mobile placement of the menisci and rotatable components the mechanical demands on anchoring in bone and thus contribute to satisfactory biological integration. During the period between June 1, 1989 and December 31, 1991 in the orthopaedic department of the general hospital in Zwettel 41 patients had 42 total endoprostheses (LCS) of the knee joint implanted. The group comprised 34 women and 7 men. All patients were checked and evaluated according to Hungerdorf's schema. The age range was 62 to 79 years with an average of 65.8 years. The follow-up period was 8 to 38 months, mean 21 months. The results as regards pain, stability, mobility, axis of the extremity and ability to walk were evaluated as very good and good. The authors discuss also postoperative complications. They did not observe loosening of cement-free components.

Aged↗

PubMedDate not supplied

[Long-term results with Zweymuller cement-free Alloclassic stem].

AIM OF STUDY: The aim of our study is to show the long-term results using the Zweymüller cementless Alloclassic stem. METHOD: In our retrospective study 133 from 206 cases (64.4%) were examined after 10.6 years. The examination was done clinically (Scheme after Merie d'Aubigné) and radiologically. The average age was 72 years (48-92 years) at the time of examination. RESULTS: Intraoperative complications occurred in 3 cases (1.5%), 2 were temporary sciatic-nerve paresis and 1 was a stem fissure. Nine cases had been revised (6.7%). In four of these cases the inlay and the head had to be changed, in two cases mechanical loosening of the cup was found; furthermore, there were one removal of heterotopical ossification and one early infection. Stem problems appeared in only one case with deep infection and had been revised twice. There was neither stem sinking nor mechanical loosening in our series. The average polyethylene wear using a ceramic head with 32 mm diameter was 1 mm after 10.6 years. Clinically excellent results were found in 90% of the cases. CONCLUSION: The long-term results using the cementless Zweymüller stem with a rectangular transversal section and easy operation technique over 20 years are excellent Because of the cortical anchorage and the biocompatible titanium alloy the Zweymüller stem can be used in all femur forms and in different age groups.

Aged↗

PubMedDate not supplied

[Retrospective study on femoral neck lengthening osteotomy].

Our retrospect study refers to the problem of improved flexibility of the hip joint, elongation of the leg as well as decrease of pain. Patients suffering from Coxa vara, a high positioned Trochanter and a short neck of the femur underwent triple osteotomy with a distal transposition of the Trochanter major. All 8 patients had a thorough clinical (according to the scheme by Merlé de Aubigné) and radiological postoperative checkup. The results were analyzed and showed an average increase of the length in leg of 1.9 cm and and average increase of capacity of abduction of 11 degrees. From these findings we draw the conclusion that triple osteotomy operation should be performed only on patients whose hip joints are free from arthrosis or show only insignificant symptoms of arthrosis.

Adolescent↗