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Biomedical subjects

F Escalas

Publications and source records attributed to F Escalas.

7 recordsLinked to original sources
PubMed1997

T-Fix anchor sutures for arthroscopic meniscal repair.

The results of arthroscopically repaired meniscal tears with the T-Fix system in a short-term follow-up of 6 months was assessed in a non-comparative, prospective study. The T-Fix device consists of a short, rigid Delrin T attached to a braided, non-absorbable, polyester suture which is preloaded inside and deployed through a delivery (spinal) needle. The T grabs inside the tissue and provides an anchor for the suture. Twenty menisci in 20 patients (mean age 29 years) were repaired. Sports-related injuries were documented in 18 patients. In 15 patients, meniscus tears were repaired 6 months or more after injury. Half of the patients had isolated meniscus injuries. Associated injuries included anterior cruciate ligament (ACL), medial or lateral collateral ligament ruptures. These were not treated at the time of meniscal surgery except for an ACL reconstruction. All tears were longitudinal and positioned mainly in the posterior horn of the medial meniscus. A total of 70 T-Fixes were used with an average of 3 per patient (range 2-7). Only 4 T-Fixes (6%) were unsuccessfully placed, and this occurred early on in the series in 4 patients. In 90% of the patients, the postoperative activity levels returned to preoperative levels, and the clinical symptoms had either resolved or were experienced at a higher level of activity. The T-Fix device was relatively easy to use and could be reliably placed in the meniscus. Postoperatively, there were no complications directly associated with the device. However, further studies are needed to confirmed these results in a long-term follow-up in a larger patient population.

Adolescent↗
PubMed1994

Occult posttraumatic bone injury.

Knee injury evaluation with magnetic resonance imaging (MRI) has enabled a high percentage of associated diagnoses of occult bone injuries. An experimental occult bone injury was produced in the rabbit knee with a controlled impact in the range of approximately half the fracture force. An MR image of the occult bone injury was obtained after killing the animals at 1, 3 and 9 weeks after impact. Histological study of the area under optical microscopy showed a benign, self-resolving injury pattern in the subchondral cancellous bone. The samples were compared with 11 human biopsy samples obtained during knee surgery. The same benign pattern was observed except for one case. The healing response of this injury at the subfracture level appears rather benign, and a permanent scar will probably not develop.

Animals↗
PubMed1980

Dislocation of the peroneal tendons. Long-term results of surgical treatment.

Twenty-eight patients with a traumatic peroneal-tendon dislocation treated surgically were clinically evaluated after an average follow-up interval of 6.8 years. Excellent results were obtained in all but one patient. Surgical treatment is recommended when dislocation recurs after initial treatment.

Adolescent↗
PubMed1976

Biocompatibility of materials for total joint replacement.

The clinical use of total joint prostheses demands absolute biocompatibility of the materials employed. The purpose of this experiment was the bioassay of some materials considered as possible candidates for use in total joint prostheses as load-bearing members or as wear-resistant surfaces. Some materials already in use were also tested. 316L stainless steel was used as a control. The materials were implanted as a standardized rod and in particulate form. An average of 12 samples per material were implanted in soft tissue for six months and a total of 145 rabbits were used in this study. Twenty-five materials including metals, polymers, and ceramics were tested in solid and powdered form. A semiquantitative evaluation of local tissue reaction and a study of organs was performed. Polymers and metallic materials showed in general a mild tissue reaction. Ceramics, which some authors describe as the best tolerated materials, elicited variable tissue responses. Some of these (glass-ceramics) presented very poor tissue tolerance. The least reactive, titanium oxide, titanium aluminate, and aluminum oxide, presented a degree of tissue reaction comparable to that of corrosion resistant metals, but not superior to them. Moderate reactivity was the general rule for particulate materials except for the Pyroceram glass-ceramics, polymides, and Teflon. Ultrahigh molecular weight polyethylene in particulate form elicited a rather cellular tissue response, a fact to be considered when projecting long-term results in total joint arthroplasty. No pathological changes compatible with systemic toxicity by materials tested were observed in the study of the organs.

Animals↗
PubMed1975

MP35N: a corrosion resistant, high strength alloy for orthopedic surgical impants: bio-assay results.

A cobalt based alloy, MP35N, with excellent mechanical properties has been recently introduced as a material for surgical orthopedic implants. A study was made of local and systemic host response to this material in two different mammal species. The implantation time ranged from one to 12 months. The result of this study indicated: MP35N produces a degree of local tissue response comparable to that of 316L stainless steel. No systemic side effects were observed during the implantation times included in this study.

Alloys↗