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At least 397 records · Page 22Linked to original sources
PubMed2007

Simulation of polyethylene wear in ankle joint prostheses.

The performance of total ankle replacements (TARs) have not been comparable to those of the other major joints of the lower extremity. The aim of this work was to develop a new simulator test to compare the wear of a new mobile bearing TAR (Mobility) with one with a good clinical history, the Buechel Pappas, using kinematic inputs derived from the literature. The wear rate for the Mobility components was lower than that for the Buechel-Pappas ankle joints at all time points. The wear rate for both sets of components increased with the inclusion of an anterior/posterior displacement in the kinematic inputs. This was expected as the components are subjected to higher kinematic demands and reproduces similar effects found in knee prostheses. This study has demonstrated that it is possible to study wear of TARs in a modified simulator originally designed for total knee replacements. It was also shown that the new Mobility ankle compares favorably with the Buechel Pappas ankle, which has a successful clinical history, under the simulator test conditions described.

Ankle Joint↗
PubMed1999

Neuromuscular compartments of cat lateral gastrocnemius produce different torques about the ankle joint.

The primary purpose of this study was to establish whether the neuromuscular compartments of cat lateral gastrocnemius produce different mechanical actions on the skeletal system, by determining the contributions made by these compartments to the torques produced about the ankle joint. It was postulated that neuromuscular compartments might represent output elements of the spinal circuits. If so, they should produce unique mechanical actions. Isometric torques about the center of the ankle joint produced by the neuromuscular compartments of the cat lateral gastrocnemius were measured with a multiaxis force-moment sensor connected to the plantar surface of the foot. Individual compartment torques were elicited by activation of the primary compartment branches of the lateral gastrocnemius nerve. The magnitude of the individual torque components, and thus of the resultant torque, was significantly different between compartments. In three of the four lateral gastrocnemius compartments, significantly different torque trajectories were noted. The results, together with those from previous studies demonstrating that compartments can be activated in a task-dependent manner, suggest that neuromuscular compartments represent anatomical substrates that can be used by the nervous system for regulating movement.

Animals↗
PubMed2005

Muscular performances at the ankle joint in young and elderly men.

The effect of aging on mechanical and electromyographic characteristics of ankle joint muscles was investigated in 11 young (mean age 24 years) and 12 elderly (mean age 77 years) males. Maximal and submaximal isometric voluntary torques were measured during ankle plantarflexion and dorsiflexion. Electromyographic activities of triceps surae and tibialis anterior muscles were recorded. The elderly group developed equal maximal dorsiflexion torques (42 vs 45 N.m, p >.05), but in plantarflexion, the elderly group was weaker (80 vs 132 N.m, p <.001) and presented a decreased twitch amplitude (11 vs 16 N.m) and lower coactivation (8% vs 15%) than that of the young adults. We established a linear relationship between the percentage of coactivation and developed resultant torque. Our results showed that dorsiflexor muscles were not affected by aging, contrary to plantarflexors, in which the decline in torque was partly explained by changes intervening at the peripheral level.

Adult↗
PubMed1991

[Endoprosthesis of the ankle joint. Indications and long-term results].

The treatment of a post-traumatic, progressively more painful ankle joint causes increasing disablement. It might require alternatives to conventional surgery if a patient does not consent to ankle arthrodesis to alleviate the pain. Therefore, we report on a retrospective study of 10 patients (age 25-73 years at the time of surgery). All of them refused arthrodesis; thus 10 total ankle arthroplasties were performed between 1982 and 1989. 5 women and 5 men were treated who have been suffering from severe post-traumatic arthrosis for 3-46 years. Since performance of a single-axis arthroplasty (ICLH prosthesis) in each patient, the mean follow-up has been 4.6 years. One year after surgery, the results could be considered good or excellent in 9 of the 10 patients; only 1 person experienced local wound infection, which led to removal of the implant 4 months later and ultimately to arthrodesis. Two years later, 7 patients are eligible for follow-up because 1 underwent surgery in February 1989. Another patient experienced aseptic loosening after 18 months; he was admitted to our hospital for arthrodesis. Three years after endoprosthetic surgery, all except 1 woman with occasional pain and stiffness were found to have satisfactory results on follow-up. The relief of pain was gratifying in all patients, with ankle function well maintained (at least 0-0-30 degrees). At present, the prosthesis is still functional in 6 patients (surgery 1.5-8 years ago). They can go about their usual daily business without apparent pain and with appropriate function; 2 of them, however, show radiolucent lines on standard X-rays of the ankle, suggesting some loosening.(ABSTRACT TRUNCATED AT 250 WORDS)

Adult↗