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Biomedical subjects

B Rosemeyer

Publications and source records attributed to B Rosemeyer.

At least 37 records · Page 2Linked to original sources
PubMed1992

[Athletic capacity after surgical management of acromioclavicular joint separation].

Acromioclavicular separation is a common injury in sports. This study was done to show the activity and problems of athletes after operative treatment of this kind of injury. Between 1986 and 1989 21 athletes with acromioclavicular separation had been treated by operation. The coracoclavicular ligaments had been sutured and augmented by a PDS cord. The acromioclavicular ligaments had also been reattached and the ac-joint had been transfixed with a Kirschner-wire. The results show 18 athletes doing their sports on the same level as preoperatively. Two athletes with a frequency of sporting activity once a week could not continue their sporting activity. One athlete changed the disciplines to less shoulder stressing kind of sport. The comparison of clinical and radiological results showed no correlation, even patients with an osteoarthrosis of the ac-joint and coracoclavicular ossifications had best clinical results. We recommend therefore operative treatment for acromioclavicular separation in athletes.

Acromioclavicular Joint↗
PubMed1991

[Treadmill versus field trial. Movement analysis and pressure distribution in the athletic shoe].

Our current knowledge on interactions between runner and runningshoe is mainly based on treadmill measurements. In order to reveal stress load and adaptation on playing surfaces it was necessary to develop a combined measuring device out of 3-D video motion analysis and portable pressure measurement system. By means of a motor driven cart moving parallel to the subject with comparable position of cameras to the treadmill test it was possible to set up an identical trial for track and field. 12 subjects (male, age 24-32, size 9) were tested at a speed of 2.8 m/s. The varying conditions were treadmill and grass and two different constructed running shoes. 200 cycles and over 1000 steps were analyzed. The quantitative analysis of 37 parameters describing the contact phase was performed using the wilcoxon test for paired samples.-A qualitative comparison of running styles was introduced by using angle-angle-diagrams (knee and ankle by 3-D data) similar to those first described for 2-D by P.R. Cavanagh in 1973. It showed a huge interindividual variability under same conditions. Comparing the angle-angle-diagrams for the four different running conditions it was possible to classify them into three characteristic groups: non-adaptors, surface-adaptors and shoe-adaptors. Comparing track and field to treadmill measurements significant differences were found for the knee at impact: On treadmill the initial knee angle was 4.6 degrees more extended at a 13% higher angle velocity and a 30% higher angle deceleration (sig. p less than 0.05). A 7.3% higher impulse was found on grass at a 5.9% higher step length. No difference in maximum pressure was found. These results show that adaptation is performed mainly by the knee. Changing the motion pattern the knee seems to be capable of homogenizing the different stress loads to the foot. Comparing the running shoes significant differences were found in the motion of the ankle: a controversial behaviour was found to be on treadmill and grass. The pressure data revealed significant differences for the treadmill test to be in the heel area, for grass in the arch area. This points to an--up to now--unknown importance of the arch on unplain surfaces that are obviously influenced by the construction of the shoe and are not accessible by treadmill tests. The described different behaviour of shoes in treadmill and track and field tests points out the reduced validity of single treadmill tests.(ABSTRACT TRUNCATED AT 400 WORDS)

Adult↗
PubMed1991

[Stability after capsular ligament surgery of the knee joint].

Post-operative checks of 57 cases of anterio-medial knee instability (II and III degree) were carried out over a period of 1-4 years after operation. "Subjective knee stability" was documented on three levels in a questionnaire as not "giving way". "Objective knee stability" was evaluated by measuring 30 degree anterior drawer displacement using the KT 1000 instrument. Strength of the thigh muscles of both legs for different power parameters under isokinetic load was measured with the Cybex II instrument system. No significant correlation between subjective perception of knee instability and instrumented measured anterior drawer displacement could be shown in a T-test. Individuals with higher "objective stability" or higher "subjective stability" level had both generally stronger tight muscle parameters, specially for knee extension. Most of our interest had the group of individuals assumed "subjective stable" but having quite a large anterior drawer displacement phenomena like ACL deficit knee. This group is characterized by higher 10 degree power parameters for knee extension and flexion and lower H/Q-quotient. This is supposed to be indication to functional adaptation of the neuro-muscular system to altered biomechanic situation after ACL disruption or reconstruction. Electromyographic studies should follow to test this hypothesis.

Exercise Test↗
PubMed1990

[Late results following meniscectomy].

In a retrospective study a total of 227 women and men between 24 and 79 years of age who had undergone meniscectomy at the State Orthopedic Clinic of Munich between 1958 and 1975 were reexamined clinically and radiologically in order to determinate late effects of surgery. Of 149 patients with an uncomplicated subtotal meniscectomy 35% showed an unsatisfactory subjective result while 62% were continuously free of symptoms regarding their operated knee. Including constitutional factors degenerative changes in the knee occurred in 50%, 34% of the total of 149 showing severe radiologic changes of grade 2 and 3. The roentgenographic changes in the knee correlated frequently with the subjective result. The frequency of degenerative arthritis in the follow-up investigation was significantly higher for patients with preoperative osteoarthritis than in those without. Some other factors seemed to have no bearing on the longterm effect of meniscectomy. The procedure of subtotal meniscectomy proved to be an important factor for degenerative arthritis. Arthroscopic and meniscus healing techniques require further examination of longterm results.

Adult↗
PubMed1990

[Restricted motion after surgery of the capsular ligament of the knee joint, with special reference to stability of the ligament and muscle status in isokinetic stress].

Post-operative checks of 57 cases of anterio-medial knee instability (II and III degree) were carried out over a period of 1-4 years after operation. On a questionnaire subjective feelings, complaints, and changes in living and sport habits, were documented. Thus a parameter for the functional result of treatment was created. Knee stability was evaluated by measurement of 30 degree anterior drawer displacement using the Medmetric corp. ligament measuring instrument KT1000. Strength of the thigh muscles of both legs for different power parameters under isokinetic load was measured with the Cybex II instrument system. In 51 cases a correlation between the movement deficit and the following parameters was assumed and tested by comparing the mean values in a T-test: side comparison of the anterior drawer phenomenon, power parameters of the thigh muscles for knee extension and flexion, score for the functional result. In case of extension deficit of the knee, it could be shown that the tension of the reconstructed crucial ligaments, which is expressed in the measured value of the anterior drawer displacement, is not as important from a causal point of view as has been supposed. Extension deficit had no obvious negative effects on the power development of the thigh muscle. However, movement restriction caused significant negative effects on functional result-score.

Anterior Cruciate Ligament↗
PubMed1988

[Factors affecting the pressure distribution underneath the foot sole in ski boots].

The determination of pressure patterns underneath the footsole inside skiboots, may reveal reasons for footpain and injury risk. In our study, a new developed 72 point measuring mat was used in 5 different skiboots. Data were collected in 10 subjects in different forward flexion positions. In addition a determination of the pressure distribution over the instep was done by means of single measuring points. The results proof, that a proper adapting along the dorsum of the foot does lower the forefoot load during flexion. A tightly closed and well adapted boot will lead to a significant reduction of the total load on the footsole. High shaft models show similar pressure patterns even at earlier forward flexion angles. A pressure related discrimination between rear entry and traditional boots, that was found along the tibia, was not the case underneath the footsole. The force transmission is mainly performed along the shaft of the boot. The effect of orthotics designed mainly to support steerability of the ski, is therefore doubtful. The results may help to improve our knowledge of the interaction between boot and skier and lead, together with future field research, to a reduction of equipment related injuries.

Biomechanical Phenomena↗
PubMed1986

[Rippstein and Müller roentgenologic determination of the actual femoral neck-shaft and antetorsion angle. 1: Correction of the conversion table and study of the effects of positioning errors].

The femoral neck-shaft angle (CCD) and the angle of torsion (AT) are angles in space; in commonly used radiographs the angles are not portrayed in their actual true size (rCCD, rAT) but in their projected size, which deviates somewhat (pCCD, pAT). The formulas required for the conversion are explained in detail and the previous conversion tables have been corrected. The effects of minor deviations (5 degrees, 10 degrees and 20 degrees, increased/decreased abduction or flexion, exterior/interior rotation) from the prescribed position of the patient have been calculated and are displayed in diagrams. It is evident that determination of the angles according to Rippstein and Müller can be influenced to a considerable extend by minor discrepancies (+/- 5 degrees -10 degrees) in the positioning of the patient. If there are high AT-angle values or positioning of the patient causes problems, and where determination of the angle would involve major therapeutic measurements, another procedure will have to be used that should be almost independent from discrepancies in the positioning of the patient.

Biometry↗
PubMed1986

[Roentgenologic determination of the actual femoral neck-shaft and antetorsion angle. 2: Alternatives to the Rippstein and Müller procedure].

The method developed by Rippstein and Müller allows mathematically exact determination of the femoral neck-shaft angle (CCD) and the angle of torsion (AT); at a deviation of 5 degrees--10 degrees from the prescribed position of the patient considerable errors (up to more than 15 degrees) can occur. For this reason two alternative methods are cited and described in detail: cinematographic determination of the CCD and AT angle according to Schwetlick and the combination of determination of the AT angle in exterior rotation according to Rogers and an anteroposterior roentgenogram of the pelvis and hips in interior rotation of the size of the AT angle. Both methods are also mathematically exact, but, in addition almost independent from minor deviations in the positioning of the patient. It is advisable to apply one of the cited methods in cases of high AT-angle values (much greater than 30 degrees), in cases where the placing of the patient is difficult and where the determination of the angles would require major therapeutic measurement.

Biometry↗
PubMed1984

Osteochondrosis dissecans of the knee. Results of operative treatment in juveniles.

This paper reports the results of 33 juvenile and 28 adult patients who were operated on for osteochondrosis dissecans of the knee. The average period of observation was 4.7 years. The results were compared according to age and stage of disease. The age of the patient at the time of operation doubtlessly has the greatest influence on prognosis. Juveniles operated on in stage II or III have a particularly good prognosis. From stage IV on it does not seem reasonable to try to preserve the dissecate. In the case of juveniles, metabolic or endocrinological diseases do not appear to be of any relevance, whereas mechanical factors like overstress during sports, hereditary ligament laxity, or deviations of the axis of whatever origin all seem to have some influence.

Adolescent↗
PubMed1981

Surface replacement of the hip. Experimental studies.

Surface replacement of the hip has been performed in 25 rabbits. Twenty animals were chosen for evaluation of the result of the operation after an average period of five months postoperatively. Tetracycline injections were given for fluorochrome labeling and radiographic controls have been made in vivo to check the position of the cup before the animals were sacrificed. Histological examinations were made from slides, which were gained after the metal cup had been removed with the bone cement still in place. It was found that the bone underneath the cup survived the surface replacement and that there was a normal metabolism further on. The trabeculae even grew into the surface structures of the inner layer of the bone cement and there was no interposition of membranes of fibrous tissue. It could be demonstrated that fibrous tissue between bone and bone cement is found only in cases of loosening of the cup and the cement or in cases of insufficient contact between this interface from the moment of the operation on. This is possible when air bubbles arise in the bone cement and get in contact with the trabeculae of the femoral head. Fluorochrome labeling proved the formation of new bone underneath the cup and the survival of the osseous structures of the coxal end of the femur. We believe, that in clinical cases it is necessary to remove all predamaged cancellous bone from the head of the femur (i.e. in cases of avascular necrosis) before the cup is attached. Close contact between the bone cement and the healthy spongiosa is one of the conditions for success in surface replacement of the hip.

Animals↗
PubMed1981

Bone-metal bonding after Kirschner wire studding. A case observation.

A clinical case is reported on in which there were difficulties in removing Kirschner wires from the bone four years after arthrodeses of a shoulder. These could only be removed with great force. They displayed muff-like mantling with bone. The histological investigations revealed that the bone had deposited directly on the metal surface and that absolutely stable bonding between the bone and the metal had occurred. In connection with similar observations in the literature, the importance of this case is pointed out with regard to the cement-free implantation of endoprostheses.

Adult↗
PubMed1980

Fractures of the hip in children and adolescents.

Long-term results of 52 fractures of the hip in 51 children and adolescents are discussed. A distinction was made between fractures in children (aged 1 to 11 years) and those in adolescents (aged 12 to 18 years). Irrespective of the type of fracture it was found that immediate operative treatment leads to the best results. In children as well as in adolescents the risk of avascular necrosis, premature closure of the epiphysis and non-union is less following immediate operative treatment than following delayed operative treatment or conservative treatment. The prognosis of these fractures depends on the amount of damage to the vascularization. Treatment of children consisted of open reduction and fixation with K-wires followed by postoperative immobilization in a hip-spica for 6 weeks. Adolescents were treated with three-flanged nails usually without postoperative plaster immobilization. In both children and adolescents internal fixation may also be carried out with screws, in which case these must not cross an open epiphyseal plate. In both groups a non-weight-bearing period of 6 to 12 months is advisable. The results in adolescents were definitely poorer than in children. Seemingly completely destroyed hips can reintegrate even to a nearly "restitutio ad integrum" state after a period of years.

Adolescent↗