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Results for “TARSAL JOINT”

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At least 361 records · Page 20Linked to original sources
PubMed2001

Pattern generation for walking and searching movements of a stick insect leg. I. Coordination of motor activity.

During walking, the six legs of a stick insect can be coordinated in different temporal sequences or gaits. Leg coordination in each gait is controlled and stabilized by coordinating mechanisms that affect the action of the segmental neuronal networks for walking pattern generation. At present, the motor program for single walking legs in the absence of movement-related coordinating intersegmental influences from the other legs is not known. This knowledge is a prerequisite for the investigation of the segmental neuronal mechanisms that control the movements of a leg and to study the effects of intersegmental coordinating input. A stick insect single middle leg walking preparation has been established that is able to actively perform walking movements on a treadband. The walking pattern showed a clear division into stance and swing phases and, in the absence of ground contact, the leg performed searching movements. We describe the activity patterns of the leg muscles and motoneurons supplying the coxa-trochanteral joint, the femur-tibial joint, and the tarsal leg joints of the middle leg during both walking and searching movements. Furthermore we describe the temporal coordination between them. During walking movements, the coupling between the leg joints was phase-constant; in contrast during searching movements, the coupling between the leg joints was dependent on cycle period. The motor pattern of the single leg generated during walking exhibits similarities with the motor pattern generated during a tripod gait in an intact animal. The generation of walking movements also drives the activity of thoraco-coxal motoneurons of the deafferented and de-efferented thoraco-coxal leg joint in a phase-locked manner, with protractor motoneurons being active during swing and retractor motoneurons being active during stance. These results show that for the single middle leg, a basic walking motor pattern is generated sharing similarities with the tripod gait and that the influence of the motor pattern generated in the distal leg joints is sufficient for driving the activity of coxal motoneurons so an overall motor pattern resembling forward walking is generated.

Animals↗
PubMed2007

Lisfranc injury: how frequently does it get missed? And how can we improve?

Lisfranc injuries are sometimes easily missed especially if they present in a subtle form. In this study, we have tried to measure the level of accuracy of plain radiographs in detecting this type of injury. We have selected 30 sets of foot radiographs with various diagnoses. Eighteen of them had a Lisfranc type of injury which was confirmed by operative findings or further imaging. These radiographs, together with a small diagnostic questionnaire, were presented to nine senior clinicians. We found that only 11 of the 18 cases (61%) were detected by all the readers. Eight of nine readers (90%) missed one particular case of subtle Lisfranc injury in a diabetic neuropathic foot. One case of a divergent injury was missed by five readers (56%). Another case with a coexistent Frieberg's disease was missed by three readers (33%). The mean accuracy for all injuries was 87% (95% confidence interval (CI) 84.6-89.9%). The mean accuracy level for detection of Lisfranc injury among the whole series was 92% (CI 89-95%). We think that the presence of a strong clinical index of suspicion or the presence of impaired pain sensation, further imaging is a must to avoid missing this type of injury at early presentation, and consequently the long term poor prognosis.

Clinical Competence↗
PubMedDate not supplied

The effects on subtalar contact and pressure following talonavicular and midtarsal joint arthrodesis.

Many clinical studies have demonstrated the effectiveness of both isolated talonavicular and complete midtarsal joint arthrodesis as an alternative to triple arthrodesis. However, in many cases, controversy exists as to which procedure to utilize. Evidence of degenerative radiographic changes and stiffness of the subtalar joint have been reported postoperatively. A cadaveric study at two different loading values, utilizing low-range pressure film transducers and digital scanning, was performed to quantify articular contact effects on the subtalar joint following isolated talonavicular joint arthrodesis and complete midtarsal joint arthrodesis as compared to the intact specimen. Statistically significant differences were found at p < .05 in this study regarding maximum contact pressure and in location of the applied pressures. Results of this study suggest complete midtarsal joint arthrodesis may be favored over isolated talonavicular joint arthrodesis, especially in the setting of a flatfoot deformity.

Aged↗
PubMedDate not supplied

Arthroscopy of the calcaneocuboid and talonavicular joints.

The authors describe the anatomy, portal placement, technique, indications, and preliminary results of seven cases of calcaneocuboid or talonavicular joint pathology that underwent elective investigational diagnostic or therapeutic arthroscopy with a follow up of 3-14 months. All patients had failed available conservative therapy. Results of treatment were five excellent and two good cases. Two patients required arthrotomy. There were no complications associated with portal placement, arthroscopic technique, or instrumentation. Arthroscopy of the calcaneocuboid and talonavicular joints has proven to be a relatively safe and valuable diagnostic and therapeutic tool. It is hoped that advances in small joint arthroscopy application will encourage further technological evolution in arthroscopic instrumentation and establish a foundation for further arthroscopic exploration of the small joints of the foot.

Arthroscopy↗
PubMed2004

Arthrodesis of the navicular.

Isolated arthrodesis of the navicular complex is a means of restoring the integrity of the medial column. This facilitates pain relief and improved function. This option should be considered in the treatment of degenerative disease in these joints. Grade III PTTI may be managed with arthrodesis of the navicular complex , provided degenerative changes are limited to the talonavicular-naviculocuneiform joints. This procedure must include concomitant correction of the hindfoot. Osseous necrosis or bone loss that is due to severe degeneration may be managed successfully with cancellous or structural grafting that is sufficient to maintain the length of the medial column. If extensive grafting increases the risk of nonunion, the navicular or its remnants can be excised and a talocuneiform fusion may be performed. Successful management of conditions that affect the navicular complex requires meticulous attention to restoration of medical column. Optical results also demand consideration of overall alignment and condition of adjacent joints.

Arthrodesis↗
PubMed1983

The functional anatomy of clubfoot.

The authors have studied anatomical specimens and findings at time of surgery to determine the functional anatomy of clubfoot. The importance of the midtarsal joints (especially of the talonavicular joint) is emphasized as well as the importance of the tibialis posterior. The findings of the authors concerning the function of these elements have allowed them to develop a new approach to the treatment of clubfoot.

Child↗
PubMedDate not supplied

Analysis of gait patterns in normal school-aged children.

The continuing development of gait in 60 children aged 7-16 years was studied with plantar surface-attached transducers to describe the time pressure profiles of foot segments during stance. Decreased pronation/supination of the subtalar and midtarsal joints was shown by simultaneous onset and simultaneous peak on medial and lateral heel sensors. The resultant midstance showed a rapid lateral-to-medial loading of the forefoot. The foot-flat position with decreased rotation about the longitudinal axis of the foot persists even after the temporal parameters of gait attain mature values.

Adolescent↗