Search PubMed⌕ Search

Biomedical subjects

R Mathys

Publications and source records attributed to R Mathys.

16 recordsLinked to original sources
PubMed2000

[Snowboarding accidents].

The present review summarises the related literature of the last ten years with request to snowboarding accidents. Sport accident statistics of snowboarding show high and increasing numbers of injuries. Already snowboarding ranks third of all sport accidents in Switzerland. According to the literature the injury risk in snowboarding is twice that of skiing, although the injuries are less serious. About 50% of the injured snowboarders are beginners. Beginners have a higher risk of injury than more advanced snowboarders. Additionally, and a relative large part of them are injured the first day of their snowboard career. The pattern of injury has changed over the last years. Today, injuries to the lower extremities account no longer for more than 50% but are now decreased to about 25%. Nowadays, wrist, knee, ankle, and shoulder are the most frequently injured body parts. It is the authors opinion that with up-to-date protectors, release bindings, and training of falling techniques the numbers and seriousness of injuries could be reduced, in particular injuries to the wrist and ankle.

Adult↗
PubMed1997

[Athletic accidents and resulting injuries].

Some 245,000 sporting accidents occur yearly in Switzerland. The social accident costs amount to approximately 1.8 billion francs per year. Every second sporting accident occurs during a ball game. For the shown sporting activities, distortion is the most common type of injury among adults and contained fractures are most common in children. As is to be expected, the number of accidents has grown along with the exploding popularity of snowboarding and in-line skating. These new sporting activities show no unknown injury patterns which would demand new treatment methods.

Adolescent↗
PubMed1991

[Initial clinical experience with osteosynthesis of femoral shaft fractures with a newly developed intramedullary implant (claw interlocking nail)].

The implantation of distal interlocking screws in interlocking nailing can be difficult and time-consuming. With the AO Universal Femoral Nail as the basis, an implant was designed with which distal interlocking is accomplished from the inside of the nail by means of a simple claw mechanism. Instrumentation and interlocking are possible from the proximal standard approach, so that an additional operation adjacent to the knee (which is necessary when interlocking bolts are used) is superfluous; neither for the insertion nor for the removal of the interlocking mechanism is an image intensifier necessary. We stabilized 24 femoral shaft fractures with this new interlocking nailing device [20 fresh fractures, 3 refractures and 1 pathologic fracture caused by tumor metastasis from chronic myeloid leukemia (CML)]. The mean age of the patients concerned was 34.8 years (18-57 years). Fractures were classified according to the Müller classification with 11 type-A fractures (45.8%), 9 type-B fractures (37.5%) and 4 type-C fractures (16.7%). There were only 2 cases (8.3%) with open fractures. In 11 cases (45.8%) the fracture was located in the midshaft region, in 6 cases (25.0%) in the proximal shaft, and in 7 cases (29.2%) in the distal femoral shaft. Multiple trauma was present in 11 patients (45.8%), while in 8 patients (33.2%) the femoral shaft fracture was the only major injury. Full weight-bearing was allowed after a mean of 4.4 weeks (0.7-8.2 weeks). In 1 case we saw a deep venous thrombosis with pulmonary embolism obvious on clinical examination and scintigraphy. Two patients died of their multiple trauma, and of cachexia the patient with the CML metastasis died 6 weeks after stabilization.(ABSTRACT TRUNCATED AT 250 WORDS)

Adolescent↗
PubMed1984

A locking hook spinal rod system for stabilization of fracture-dislocations and correction of deformities of the dorsolumbar spine. A biomechanic evaluation.

Existing internal fixation systems for the injured or deformed spine present problems with overdistraction and control of the contoured rod necessary for transverse forces. A locking hook spinal rod avoids these problems by using a locking cover to secure the lamina in the hook and meshing radial grooves to lock the contoured rod to both the upper and lower hooks in 6 degrees intervals of rotation. The 7-mm stainless-steel rod is 50% stronger than the 1/4-in Harrington rod and also avoids the weakening effect of the notches. Cadaver spine testing gives nearly a threefold increase in failure strength (125 +/- 17 Nm versus 44.1 +/- 2.1).

Adult↗
PubMed1983

A locking hook-spinal rod: current status of development.

A locking hook spinal rod previously demonstrated to be sufficiently stable and strong in cadaver experiments has been employed in 30 unstable thoraco-lumbar spinal injuries with results superior to Harrington instrumentation.

Humans↗
PubMed1982

Cementless isoelastic RM total hip prosthesis.

Some surgeons are beginning to doubt the reliability of bone cement in joint replacements. In 1967 Robert Mathys conceived the idea of an isoelastic prosthesis made of plastic, which would anchor into the bone without cement. He developed the idea by extensive tests in animals and, in 1973, the first human RM cementless hip prosthesis was inserted by E Morscher. In this paper the concept of the cementless isoelastic prosthesis is developed by Robery Mathys, and Professor Bombelli records his experience with the prosthesis between 1977 and 1981.

Aged↗
PubMed1981

The treatment of femoral neck fractures with an isoelastic endoprosthesis implanted without bone cement.

We report about our first experiences inserting an "isoelastic" femoral endoprosthesis in cases of a fractured femoral neck. 28 patients have been observed for a period of more than 1 year after surgery. We did not find loosening or incompatibility of the polyacetal-resin material. We believe the implantation of this prosthesis type without cement fixation is especially advantageous. The histologic result of a patient who died 6 weeks after surgery did not reveal any tissue incompatibility. We observed an excellent fixation of the prosthesis by bone growth into the surface indentations of the stem.

Aged↗
PubMed1979

Special instruments and prosthetic cups for the removal and replacement of a total hip prosthesis.

In the course of replacing more than 500 total hip prostheses over a period of five years the authors have developed a new set of instruments for the removal of the defective prosthesis and cement and for improved anchorage of the new prosthetic cup. The set comprises: 1. A set of special chisels and an axially guided drill for removal of the old cement from the femur. These instruments greatly simplify the latter procedure. 2. A new type of prosthetic cup with a weight-bearing collar. This cup is used for cases in which the amount or structure of the acetabular bone is such that it will not support a conventional cup. 3. A new type of drill with a flexible drive and easily exchangeable drill bits for cutting anchorage holes in otherwise inaccessible parts of the acetabular bone.

Hip Joint↗
PubMed1979

[A method of quantitative determination of tissue tolerance in decreased relative movement between implant and tissue].

A method of testing in vivo tissue tolerance to different implant materials is presented. It aims at reduction of variance due to mechanical irritation at the tissue-implant interface through the use of cylindrical implants with grooves. The special type of histological preparation which is necessary and problems encountered when using these techniques are described. The numerical evaluation of round cells and foreign body giant cells seems to give uniform results with low variance, which could be of interest for standard testing of material.

Animals↗