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At least 865 records · Page 48Linked to original sources
PubMed2003

Physiological coxa varus-genu valgus influences internal knee and ankle joint moments in females during crossover cutting.

This study evaluated the ankle and knee electromyographic, kinematic, and kinetic differences of 20 nonimpaired females with either neutral (group 1) or coxa varus-genu valgus (group 2) alignment during crossover cutting stance phase. Two-way mixed model ANOVA (group, session) assessed mean differences ( p<0.05) and correlation analysis further delineated relationships. During impact absorption, group 2 displayed earlier peak horizontal braking (anterior-posterior) ground reaction force timing, decreased and earlier peak internal knee extension moments (eccentric function), and earlier peak internal ankle dorsiflexion moment timing (eccentric function). During the pivot phase, group 2 displayed later and eccentrically-biased peak ankle plantar flexion moments, increased peak internal knee flexion moments (eccentric function), and later peak knee internal rotation timing. Correlation analysis revealed that during impact absorption, subjects with coxa varus-genu valgus alignment (group 2) displayed a stronger relationship between knee internal rotation velocity and peak internal ankle dorsiflexion moment onset timing ( r= -0.64 vs r = -0.26) and between peak horizontal braking ground reaction forces and peak internal ankle dorsiflexion moment onset timing ( r= 0.61 vs r= 0.24). During the pivot phase these subjects displayed a stronger relationship between peak horizontal braking ground reaction forces and peak internal ankle plantar flexion moment onset timing ( r= -0.63 vs r= -0.09) and between peak horizontal braking forces and peak internal ankle plantar flexion moments ( r= -0.72 vs r= -0.26). Group differences suggest that subjects with coxa varus-genu valgus frontal-plane alignment have an increased dependence on both ankle dorsiflexor and plantar flexor muscle group function during crossover cutting. Greater dependence on ankle muscle group function during the performance of a task that requires considerable 3D dynamic knee joint control suggests a greater need for frontal and transverse plane weight bearing tasks that facilitate eccentric ankle muscle group function to optimize injury prevention conditioning and post-surgical rehabilitation programs.

Adolescent↗
PubMed1976

[The anterior instability of the ankle joint in lateral ligament lesions (author's transl)].

In 50 unbiased ligamentous ruptures of the lateral ankle the anterior and the lateral instability of the ankle was evaluated by x-ray-pictures under strain. With increasing talar tilt the anterior instability also increased. But in some cases an isolated anterior and an isolated lateral instability could be found. The routine use of the x-ray-picture under strain in the sagittal plane is recommended, because the isolated rupture of the anterior fibulotalar ligament can be detected only by this mean.

Adolescent↗
PubMed2000

Anatomical reconstruction versus tenodesis for the treatment of chronic anterolateral instability of the ankle joint: a 2- to 10-year follow-up, multicenter study.

The clinical outcome of anatomical reconstruction or tenodesis in the treatment of chronic anterolateral ankle instability was assessed in a retrospective multicenter study. The anatomical reconstruction group (group A) consisted of 106 patients (mean age at operation 24 +/- 8.4 years) and the tenodesis group (group B) of 110 patients (mean age at operation 26 +/- 11.4 years). Patients were evaluated at a mean follow-up of 5.5 +/- 2.8 years in group A and 5.2 +/- 2.9 years in group B. The review protocol included patient characteristics, physical examination, two ankle scoring scales to evaluate the functional results, and standard anteroposterior and lateral radiographs to evaluate degenerative changes. Mechanical stability was evaluated using standardized stress radiographs. A larger number of reoperations was performed in group B (P = 0.008). At physical examination, more patients in group B had a smaller range of ankle motion than those in group A (P = 0.009). A larger proportion of patients in group B had medially located osteophytes, as seen on standard radiographs (P = 0.04). On stress radiographic examination, the mean talar tilt (P = 0.001) and mean anterior talar translation (P < 0.001) were seen to be significantly greater in group B than in group A. There were no differences in mean Karlsson score between the groups, but more patients in group A had an excellent result on the Good score (P = 0.011). Unlike anatomical reconstructions, tenodeses do not restore the normal anatomy of the lateral ankle ligaments. This results in restricted range of ankle motion, reduced long-term stability, an increased risk of medially located degenerative changes, a larger number of reoperations, and less satisfactory overall results.

Adolescent↗
PubMed2001

[Effect of external stabilization aids of the upper ankle joint on sports-specific performance with reference to isokinetic strength measurements].

Two questions were investigated: Do ankle devices have any influence on sports performance? Are there any differences between the devices? 31 participants could be included. The average age was 24.5 (+/- 4.1). The participants exercised 5.8 hours/week. We tested 41 ankles without any previous injury. With the Cybex 6000 four parameters were evaluated. Torque maximum for the plantarflexion, range of motion, work in Joule. The ankles were tested with three different ortheses, ankle taping and without any device. The Friedman Test was used to evaluate differences between the five test conditions. All measurements showed significant worse results for the devices and taping. The protective effect of ankle devices is well known. In this investigation we could show a restriction of the performance. Thus it should be decided individually, if an ankle device is useful.

Adult↗