PubMed Health⌕ Search

Biomedical subjects

R Myrnerts

Publications and source records attributed to R Myrnerts.

15 recordsLinked to original sources
PubMed1990

High tibial osteotomy for medial osteoarthritis of the knee. A 5 to 7 and 11 year follow-up.

On three occasions we have reviewed a series of knees after high tibial osteotomy for osteoarthritis: 99 were reviewed at one to two years; 81 at a mean of 5.7 years; and 65 at a mean of 11.9 years. At one to two years and at 5.7 years over 50% were good and over 75% acceptable. At 11.9 years, 43% were good and 60% acceptable. We determined the mechanical axis through the knee in maximum varus and maximum valgus; significantly better results were found if a mean angulation of 3 degrees to 7 degrees of valgus had been achieved at operation. We also measured intercondylar distances under varus and valgus stress, and found no significant lateral compartment narrowing. The best results were seen in knees with pre-operative grade I or grade II osteoarthritis and valgus deviation after osteotomy.

Adult↗
PubMed1986

Long-term follow-up of patients with geomedic prostheses.

Of 122 Geomedic arthroplasties performed, 85 were possible to follow up. The mean observation period was 58 months. The original position of the prosthesis was analyzed with respect to its effect on the clinical condition. A score system was used for this purpose. A normal alignment was obtained in 51%. No statistically significant correlation could be shown between a high radiographic score and a high clinical score. A resorption zone of 2mm or more, considered a sign of loosening, arose in 37% and a coexisting change of position in 12%. There is no difference in radiographic score between the prostheses which were judged as loose and the other prostheses. Twelve percent of the patients were reoperated because of loosening. The patients consider their condition to be very good or good in 93% of cases. Pain at rest and pain on weight bearing were totally absent in 87% and 72% of cases respectively.

Adult↗
PubMed1985

Ventralization of the tibial tubercle for patellar pain.

In this study patellar pain in 37 knees was treated by ventralization of the tibial tubercle. No primary arthrotomy was performed. Seventy-three percent of the knees improved in the opinions of the patients, 11% remained unchanged, and 16% grew worse. Extension did not deteriorate in any knee. No serious complications were encountered. Seven patients had to undergo reoperation. It is suggested that patellar pain should be subdivided into that due to excess pressure, that due to instability, and that due to excess intraosseous venous pressure, in order to find a treatment appropriate to the cause in each case.

Adolescent↗
PubMed1980

Knee instability before and after high tibial osteotomy.

Knee joints were examined by three-point measurement (Edholm et al. 1976, 1977). The instability in arthrotic joints did not differ significantly from that in normal knees, but the varus/valgus deviation as measured by the three-point technique differed significantly from that in normal knees. After high tibial osteotomy for varus malalignment the instability increased significantly. An increase of more than 2 degrees was associated with significantly poorer subjective results of operation. The findings indicate that shortening of the lateral stabilizing structures of the knee joint should be carried out in connection with high tibial osteotomy for varus malalignment. No upper limit of preoperative instability consistent with a good result of operation was established.

Aged↗
PubMed1980

Clinical results with the SAAB jig in high tibial osteotomy for medial gonarthrosis.

In 56 patients with medial gonarthrosis high tibial osteotomy was performed using the SAAB jig, and another 43 patients with the same condition were operated on without this aid. Significantly greater precision was achieved in the removal of a wedge of the intended size with the aid of the SAAB jig. There was also significantly less increase in anterior inclination of the articular surface of the tibia on lateral X-rays when the SAAB jig was used. Operation using the device is not technically difficult, but is more time-consuming. The SAAB jig is a useful tool for achieving the predetermined correction in high tibial osteotomy.

Aged↗
PubMed1980

Failure of the correction of varus deformity obtained by high tibial osteotomy.

Failure of the correction of varus deformity after high tibal osteotomy has been analysed in 99 knee joints. As this relapse occurred mainly after removal of the cast at 6 weeks, it is recommended that the patient should not load the affected leg without a cast until 10 weeks after the operation. No patient-linked factor was identified that might be considered to account for the failure of correction during union. There was a tendency for the valgus/varus deviation of the knee, as determined by the three-point technique, to drift in the varus direction. Between 3 and 24 months after the operation this drift was on average 1.1 degree.

Adult↗
PubMed1980

Optimal correction in high tibial osteotomy for varus deformity.

As a basis for determining the required correction in high tibial osteotomy a measurement of the laterl angle between the axes of the femur and the tibia on standing films is not sufficiently reliable, because the knee can be maintained in various positions through muscular action. When the three-point technique is applied the medio-lateral instability of the knee joint can be determined and by using the varus/valgus deviation as measured in this way the desired correction can be calculated. For this patient series it was found that correction to between 3 and 7 degrees valgus of the varus/valgus deviation (three-point technique) led to the best subjective ratng of the end result by the patients. To compensate for the expected subjective relapse after the operation another 1 or 2 degrees may be added to the angular change at the operation. To avoid an increase in the instability of the knee a lateral capsule reconstruction should be performed.

Adult↗
PubMed1978

The SAAB jig: an aid in high tibial osteotomy.

To increase the precision of high tibial osteotomy a surgical tool has been developed. The instrument is described. The precision obtainable using the instrument is found to be significantly ( P less than 0.001) higher than that obtained when operating without the instrument.

Evaluation Studies as Topic↗
PubMed1977

Knee instability and tibial osteotomy. A clinical study.

Twenty-one gonarthrosis patients were preoperatively assessed according to a newly developed orthoradiographic technique ("three-point measurement") and followed up for 2-3 years postoperatively using this technique. The medio-lateral instability of the knee joints was not influenced by the operation. The varus/valgus deviation was under-corrected, on average, but the deviation did not increase significantly with time after the operation. Judging from this pilot study the three-point measurement technique supplies relevant information and it is now being used in a prospective study on high tibial osteotomy in gonarthrosis.

Aged↗
PubMed1976

Knee instability. An orthoradiographic study.

An orthoradiographic method for preoperative assessment of mediolateral instability and varus/valgus deviation in gonarthorsis is presented. A special definition of the varus/valgus deviation is given. The examination technique has been tested on 15 young, healthy subjects with no clinical signs or symptoms in their knee joints. To test the accuracy of the method, seven of the subjects were re-examined at a later date.

Humans↗