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Biomedical subjects

H Tropp

Publications and source records attributed to H Tropp.

32 records · Page 2Linked to original sources
PubMed1990

Previous injuries and persisting symptoms in female soccer players.

One hundred and fifty players in a female senior soccer division, starting up a new season, were examined for past injuries and persisting symptoms. An incidence of 0.18 injury/player/year was found, which is not significantly different from previously reported injury rates for male soccer. Sprains to the lower extremity and shin-splints were the most common previous injuries. Forty-three percent of the players had some kind of persistent symptom as a result of a past injury. Symptoms from previous ankle and knee sprains and from overuse injuries were the most common. Players who had sustained an ankle joint injury were more prone to have persistent symptoms (p less than 0.05) if they had persistent mechanical instability. Compared to previous retrospective studies on men's soccer, the women showed a higher rate of previous patellar dislocations. These injuries often caused persistent symptoms. The women showed fewer serious knee injuries. This might depend on a real difference in incidence or is just a reflection of female players ceasing to play soccer after a severe knee injury.

Adolescent↗
PubMed1990

Normal course of events amongst Swedish soccer players: an 8-year follow-up study.

In this study 180 male soccer players entered into a prospective study of injuries in 1980. They were examined again in 1988. The aim of the present study was to evaluate the course of events during their active period. The study was carried out using a questionnaire. The importance of major injuries was evaluated. Hospital records were scrutinized and 179 of 180 (99 per cent) were included in the evaluation.

Adolescent↗
PubMed1990

The incidence of ankle sprains in soccer.

This study investigated the relationship between exposure time and ankle sprains in soccer. Forty-one teams (639 players) from four male senior soccer divisions at different levels of skill (divisions I-VI) were followed prospectively for 1 year. The exposure to soccer and the number of injuries per player were higher in higher divisions, but the injury incidence, percentage of ankle injuries and incidence of ankle injuries were the same at different levels of skill. Of all injuries 17 to 20% were ankle sprains and the incidence varied between 1.7 to 2.0 ankle injuries per 1,000 hours of exposure. Since players with previous ankle problems run an increased risk of reinjury we suggest that these players receive preventive advice.

Adult↗
PubMed1989

A wheelchair ergometer with a device for isokinetic torque measurement.

A wheelchair ergometer has been developed for the study of wheelchair work. At each propulsion the peak torque can be examined, and there is an opportunity to directly study angular amplitude, power output, work etc. The physical capacity of the subject as well as the importance of chair adjustments upon performance can be evaluated.

Equipment Design↗
PubMed1988

Postural control in single-limb stance.

Postural control in single-limb stance has previously been shown to be impaired among soccer players with functional instability (FI) of the ankle joint. The aim of the present study was to further study the role of the ankle in postural control. A dynamic method was used involving optoelectronic movement recordings of body segments and force-plate recordings of the reaction ground force. Surface electromyography was recorded for the peroneus longus muscle. Thirty physically active men were selected. Fifteen of them had FI of the ankle chosen for recording. The results show that different patterns exist for maintaining equilibrium in single-limb stance. The ankle has a central role for postural corrections. The position of center of pressure is highly correlated to the position of the ankle and peroneal muscle activity. When the body was in disequilibrium, corrections were made at the hip. It is proposed that a change from an inverted pendulum model to a multisegmental chain model takes place when adjustments at the ankle joint no longer suffice to maintain postural control. The men with FI showed impaired postural control associated with increased upper segmental corrections.

Adolescent↗
PubMed1988

Effect of ankle disk training on postural control in patients with functional instability of the ankle joint.

The postural control of ten male soccer players with functional instability (FI) of the ankle joint, i.e., recurrent sprains and/or a feeling of giving way, was studied before and after ankle disk training. Postural control was studied by means of stabilometry and an optoelectronic movement recording system. In the present study, we found increased postural sway in men with functional instability, which is in line with previous studies. We found improved postural control after ankle disk training as shown by stabilometry. Postural correction patterns were restored, and segmental displacement amplitudes reached even supranormal values. A subgroup of players with unilateral FI also decreased postural sway when standing on the non-symptomatic, untrained foot after ankle disk training. This bilateral improvement and the restored postural correction pattern do not tally with Freemans proprioceptive theory for postural control, but stresses the importance of central motor programs.

Adult↗
PubMed1987

Testing of isokinetic muscle strength in the ankle.

The purpose of this study was to evaluate isokinetic strength measurement in ankle joint. The study was divided into three parts. A comparison of dorsal and plantar flexion with and without consideration to the biomechanical circumstances was done. The series comprised 15 men and 10 women. A comparison of strength measurements of dorsal flexion with and without fixation of the upper trunk. The series consisted of 10 men. A reference series for dorsal and plantar flexion comprising 15 men (mean age = 34 +/- 9 yr) was used for comparison. Strength was tested at 0 degree, 15 degrees, 30 degrees, 60 degrees, 120 degrees, 180, and 240 degrees/s. The readings made without biomechanical adjustment were significantly higher than connected readings. Mean difference at 30 degrees/s was 8.4 +/- 7.1 Nm for dorsal flexion and 18 +/- 3.1 Nm for plantar flexion. The torque values were significantly higher when the upper trunk was not immobilized, and higher standard deviations were obtained. The left (viz. dominant) leg produced significantly higher muscle torque at all velocities for plantar flexors and at all but 180 degrees and 240 degrees/s for dorsal flexors. The regression coefficient was used as a measure of peak torque velocity relation, the coefficient was -0.50 +/- 0.16 for plantar flexion and -0.22 +/- 0.06 for dorsal flexion.

Adult↗
PubMed1986

Pronator muscle weakness in functional instability of the ankle joint.

Functional instability, i.e., recurrent sprains or a feeling of "giving way" of the ankle, is common after ankle sprains. These patients have been supposed to have peroneal muscle weakness based on manual methods for measuring muscle strength. We have confirmed this theory by an isokinetic method for testing pronator muscle strength. Pronator muscle weakness on the affected side was found among patients with unilateral functional instability of the ankle joint. Impaired postural control was demonstrated by stabilometry with the patient standing on either foot.

Adolescent↗
PubMed1985

Stabilometry recordings in functional and mechanical instability of the ankle joint.

Functional instability, i.e. recurrent sprains or a feeling of giving way in the joint, is common after ankle sprain. Using stabilometry, an objective and quantitative method for studying postural control, we earlier showed that soccer players with pathological stabilometric results are at risk for ankle joint injury. In the present study we found that the ability to maintain postural equilibrium as demonstrated by stabilometry was reduced among players with functional instability, but was not affected by mechanical instability. The results indicate that coordination and postural control are important for functional instability of the ankle.

Ankle Joint↗
PubMed1984

Stabilometry in functional instability of the ankle and its value in predicting injury.

Stabilometry is an objective method used for studying postural equilibrium quantitatively. Stabilometric recordings were made in 127 soccer players to demonstrate functional instability of the ankle joint. The presence of previous ankle joint injuries, i.e., sprains or fractures, was documented. Reference values for stabilometry were obtained from a group of 30 normally-active non-soccer players without a history of injury to the ankle joint. A pathological stabilometric value was defined as one exceeding the mean value of the reference group by 2 SD. In players with a history of previous ankle joint injury no increased postural sway was found. On the other hand, players showing abnormal stabilometric values ran a significantly (P less than 0.001) higher risk of sustaining an ankle injury during the following season compared to players with normal values. Players with a history of previous ankle joint injury did not run a higher risk compared to players without previous injury. The findings indicate that an ankle joint injury did not result in a persistent functional instability; however, such instability did increase the risk of ankle joint injury.

Adolescent↗
PubMedDate not supplied

Factors affecting stabilometry recordings of single limb stance.

Stabilometry is an objective method for the quantitative study of postural equilibrium and has previously been shown to correlate to functional instability of the ankle joint. Stabilometric recordings of 25 soccer players did not confirm existing theories that an ankle joint injury itself produces a functional instability. Stabilometric recordings of 38 soccer players with and without ankle taping did not show that taping influenced the stabilometric values. In 10 soccer players with functional instability, a significant improvement of stabilometric results and subjective "giving way" feelings were found after 6 weeks of coordination on an ankle disk.

Acute Disease↗
PubMedDate not supplied

Prevention of ankle sprains.

Two different methods for the prevention of ankle joint injuries in soccer were tested. Coordination training on an ankle disk improves functional stability and postural control, whereas an orthosis provides mechanical support. Both techniques reduce the frequency of ankle sprains in soccer players with previous ankle problems. The orthosis is an alternative to taping, and can be used during the rehabilitation period after injury or when playing on uneven ground. Coordination training on an ankle disk ought to be included in the rehabilitation of ankle injuries to prevent functional instability. It may also be done prophylactically by players with previous ankle problems in order to break the vicious circle of recurrent sprains and feeling of giving way.

Ankle Injuries↗
PubMedDate not supplied

Altered movement and muscular-activation patterns during the one-legged jump in patients with an old anterior cruciate ligament rupture.

We studied nine patients with an isolated, unrepaired rupture of the anterior cruciate ligament to evaluate whether well-rehabilitated patients with an old rupture of the anterior cruciate ligament had adapted their patterns of motor control in situations that provoke knee instability and if the possible adaptation results in a measurable decrease of the deteriorating sagittal shear load. The study was performed by means of a movement analysis system with synchronized force plate and electromyographic recordings. A different movement and muscular-activation pattern was found for the injured leg compared to the noninjured when performing a one-legged jump for distance. An internal knee model was developed and implemented. In that way, a simultaneously decreased capsuloligamentous sagittal load at the landing moment was shown.

Adaptation, Physiological↗