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Results for “Collateral Ligaments”

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At least 667 records · Page 37Linked to original sources
PubMed1987

Temperature dependent behavior of the canine medial collateral ligament.

The temperature dependent tensile behavior of ligament was investigated from 2 degrees C to 37 degrees C. Nondestructive cyclic tests were performed on ten canine femur-medial collateral ligament-tibia (FMT) complexes at sequential temperatures of 22 degrees C, 22 degrees C, 27 degrees C, 32 degrees C, 37 degrees C, and again at 22 degrees C. The samples were rested at zero load between tests for sufficient time periods to allow for full recovery from the ligament's time and history dependent viscoelastic properties. Ten additional FMT complexes were sequentially tested in a similar fashion, but at temperatures of 22 degrees C, 22 degrees C, 2 degrees C, 6 degrees C, 14 degrees C, and 22 degrees C. All canine FMT complexes showed temperature dependent viscoelastic properties: the measured area of hysteresis decreased with increasing temperature; the cyclic load relaxation behavior plateaued to a higher value at lower temperatures; and the tensile load at a predetermined ligament substance strain level had an inversely proportional relationship with respect to temperature.

Animals↗
PubMed2000

Variations in the normal anatomy of the collateral ligaments of the human elbow joint.

The variations which occur in the medial and lateral ligament complexes of the elbow were investigated. These occurred frequently with the standard appearances occurring in no more than half the specimens on the medial side and one quarter of those on the lateral side. Surgeons who regularly perform elbow arthroplasty must be aware of these considerations, especially with the introduction of unconstrained prostheses which rely upon the ligament complex for their postoperative stability.

Aged↗
PubMed1999

Collagenase degradation decreases collagen fibril diameters--an in vitro study of the rabbit medial collateral ligament.

Based on the similarity of fibril diameters in healing and grafted ligaments, it has been speculated that all small fibrils represent newly synthesized collagen. Alternatively, small fibrils in grafts could be due to enzymatic degradation of endogenous large fibrils. This study examined the effect of collagenase on collagen fibril diameters in normal NZW rabbit MCLs. Midsubstance MCL slivers were incubated in buffer for 72 or 144 h for comparison with slivers incubated in buffer containing 4 units/ml bacterial collagenase. The samples were examined under TEM for fibril diameter analysis. Mean fibril diameters of 3-day and 6-day collagenase-treated MCLs were significantly reduced, resembling 40-week scar values. These results suggest that collagenase treatment can alter collagen fibril diameter and shape in normal rabbit MCL, thus it is possible that despite their similarity to ligament scars, that at least some small fibrils in ligament grafts may be enzymatically reduced endogenous fibrils.

Animals↗
PubMed1992

Immunohistochemical localization of beta 1-integrins in anterior cruciate and medial collateral ligaments of human and rabbit.

The integrins are a family of adhesion-mediating cell surface receptors that play critical roles in cell-extracellular matrix interactions and have been shown to be important in the healing response in several tissues. We have studied integrin expression in normal human and rabbit anterior cruciate (ACL) and medial collateral (MCL) ligaments of the knee as a preamble to studies of beta 1-integrin expression in healing ligaments. Histologic sections of human and rabbit ACL and MCL were probed for integrin expression utilizing integrin-specific monoclonal antibodies (mAbs) followed by immunoperoxidase detection. Staining of human specimens with mAbs revealed the presence of beta 1-, alpha 1-, and alpha 5-integrin chains on the tissue fibroblasts of both ACL and MCL, while staining of rabbit specimens with rabbit integrin-reactive monoclonals revealed the presence of beta 1- and alpha 5-integrin on these ligaments. Equivalent amounts of the integrins studied were present on normal ACL and MCL. We conclude that the rabbit is an appropriate model for analyzing the expression and functional role of integrins in ligament wound healing.

Animals↗
PubMed1976

Lateral collateral ligament ankle injuries in young athletic individuals.

1. Eleven cases of surgical repair of acute tears of the capsule, anterior talo-fibular, and calcaneo-fibular ligaments of the ankle in young athletic individuals are reported. 2. Diagnosis was made by clinical examination and stress X-rays and confirmed by arthrography in selected cases. All of the ligament ruptures were visualized at surgery. 3. Post-surgery, all of the patients had a stable ankle and were able to return to vigorous athletic endeavors without disability. 4. This study lends support to the impression that surgical repair of severe lateral collateral ankle ligament injuries in young athletic individuals leads to a functionally and mechanically stable ankle able to withstand severe stress without disability.

Adolescent↗
PubMed1995

[Current status of diagnosis and therapy of chronic collateral ligament instability of the ankle joint: results of a survey of 267 German clinics in 1994].

A questionnaire was mailed to the heads of 400 German orthopaedic departments listed by the "Deutsche Gesellschaft für Unfallchirurgie", with the aim of evaluating the diagnostic and therapeutic approaches to chronic ankle instability that were current in 1994. The questionnaire was structured to focus on diagnostic imaging techniques, conservative and surgical management, and postoperative treatment. Evaluable questionnaires were returned from 267 hospitals (66.7%). The number of ligament reconstructions performed per institution ranged from 1 to over 100 (mean 17.5). Radiographic stress investigations and clinical examination were considered by 71.6% of the surgeons to be the most important criteria for surgical therapy. The methods most frequently used for primary reconstruction of the ligaments were: periosteal flaps (45.3%), anatomical repair (23.6%), different tenodeses (20.6%), and free anatomical implants of autologous or exogenous material (10.5%). Half the respondents used reconstruction procedures involving secondary repair of the injured ligament without augmentation or with periosteal flaps. The other half of the German surgeons preferred tenodeses or various other procedures. Conservative management of chronic ankle instability was considered by surgeons to be less appropriate for young active patients. Postoperative treatment includes casting and orthosis. The duration varied from 2 weeks to 8 weeks. The results of the nationwide survey demonstrate that more objective clinical methods of diagnosis are needed to allow preoperative differentiation between functional and mechanical instability. With better knowledge of the function of individual ligaments and more frequent exposure of the ligaments for simple overlap and direct suture, a lower rate of primary non-anatomical reconstructions may be possible in the future.

Adult↗
PubMed2000

Collateral ligament prosthesis for the repair of subluxation of the metatarsophalangeal joint in a jersey cow.

A two-and-a-half-year-old Jersey cow had been moderately lame in its right hindlimb for one month. Clinical and radiographic examinations revealed an incomplete lateral luxation of the metatarsophalangeal joint. The medial condyle of the metatarsal bone was locked in the condylar groove of the medial first phalanx. The subluxation was reduced, the joint carefully debrided and irrigated, and the torn ligament was replaced with a synthetic prosthesis which was fixed with titanium alloy staples. One year after surgery, the joint was slightly swollen but the cow was not lame.

Animals↗