Publications by authors named "Mj Concannon"

Background: Soft-tissue defects of the distal lower extremity and foot present significant challenges to the reconstructive surgeon. The reverse superficial sural artery flap (RSSAF) is a popular option for many of these difficult wounds. Our initial experience with this flap at multiple institutions resulted in a 50% failure rate, mostly because of critical venous congestion.

View Article and Find Full Text PDF

Background: Amifostine is a pharmaceutical agent that is used clinically to counteract the side-effects of chemotherapy and radiotherapy. It acts as a free radical scavenger that protects against harmful DNA cross-linking. The purpose of this study was to determine the effect of amifostine on the development of skin cancer in xeroderma pigmentosum (XP) mice exposed to ultraviolet B radiation (UVB).

View Article and Find Full Text PDF

Background: Postoperative splinting is common after carpal tunnel release, despite a lack of scientific evidence supporting its value. The purpose of this study was to characterize postoperative splinting regimens among hand surgeons and to identify trends in splint use after this procedure.

Methods: Questionnaires were mailed to members of the American Society for Surgery of the Hand.

View Article and Find Full Text PDF

Objective: Magnets are purported to aid wound healing despite a paucity of scientific evidence. The purpose of this study was to evaluate the effect of static magnetic fields on cutaneous wound healing in an animal model. The literature was reviewed to explore the historical and scientific basis of magnet therapy and to define its current role in the evidence-based practice of plastic surgery.

View Article and Find Full Text PDF

Background: Herbal medicines are used by a considerable number of surgical patients. An increased risk of bleeding, substantiated by anecdotal reports, has been attributed to the use of certain herbs, and numerous in vitro experiments have identified some herbal extracts as platelet inhibitors. The purpose of this investigation was to determine whether standard commercial preparations of commonly used herbal medicines have an effect on platelet function in vivo and, by extension, to provide clinical scientific evidence of the safety of their use in the perioperative period.

View Article and Find Full Text PDF

Background: Matrix metalloproteinases are enzymes that serve to degrade the extracellular matrix, giving them a central role in the inflammatory and wound-healing processes; they have been implicated in the pathophysiology of hypertrophic scarring. The purpose of this study was to examine the effect of minocycline, a matrix metalloproteinase inhibitor, on hypertrophic scarring.

Methods: Standardized wounds were created on the ears of eight New Zealand White rabbits.

View Article and Find Full Text PDF

Background: Microvascular anastomotic thrombosis is a significant clinical problem, particularly in crush and avulsion injuries. Platelet deposition plays a particularly important role in the initiation and propagation of microvascular thrombosis, whereas thrombin has little effect in the acute phase of thrombus formation. Nevertheless, heparin (a specific thrombin inhibitor) remains the most widely used microvascular irrigant.

View Article and Find Full Text PDF

Fresh water injuries are often contaminated with bacteria that are not typically encountered in other wounds. Their treatment should include empiric administration of appropriate antibiotics. This study identifies the most common pathogens found in the Lake of the Ozarks and their antibiotic sensitivity.

View Article and Find Full Text PDF

There are two types of fungi (yeasts and molds) both of which can cause superficial infections of the perionychium. Yeasts (such as Candida albicans) grow as single cells and reproduce by asexual budding. In contrast, molds grow in long filaments, called hyphae.

View Article and Find Full Text PDF

Free fat grafts from liposuction aspirate can be used as donor material for soft-tissue augmentation. The purpose of this study was to attempt to identify a subpopulation of adipose cells within liposuction aspirate with the greatest viability and, it is hoped, a greater chance for increased survival after transplantation. Liposuction samples were obtained from 20 individuals (16 women, four men; age range, 27 to 49 years).

View Article and Find Full Text PDF

Endoscopic carpal tunnel release has been used to decompress the median nerve in carpal tunnel syndrome for over the past decade, with an advantage (over the traditional "open" release) being decreased pain in the postoperative period. The goals of this study were to attempt to define the recurrence rate after endoscopic carpal tunnel release and to determine if it differs from that of open technique. The charts of 191 consecutive carpal tunnel syndrome patients treated operatively at the University of Missouri were reviewed.

View Article and Find Full Text PDF

Dynamic traction and early motion have been used by hand therapists to treat proximal interphalangeal joint fractures with good results. However, metacarpophalangeal joint fractures have been neglected, perhaps because of their relative infrequency. The purpose of this case study is to report the authors' experience using dynamic traction in conjunction with early motion to treat a construction worker who fell from scaffolding and sustained a complex fracture of the left smallfinger proximal phalanx with involvement of the metacarpophalangeal joint.

View Article and Find Full Text PDF

Tumescent liposuction is currently one of the most commonly performed aesthetic procedures. Despite the variable use of preoperative antibiotics, infection is uncommon. Prior works suggest that the low incidence of infection may be due to lidocaine's antibacterial properties.

View Article and Find Full Text PDF

The use of digital wound images could allow remote consultation among patients, physicians, or other care-givers located at quite distant sites by means of the Internet. To evaluate the efficacy and validity of digital images for the evaluation of wounds, the ability and reliability of surgeons to diagnose and make treatment suggestions using digital images of several types of wounds were compared. Twenty-four wound images on 35-mm slides were selected for use in this study.

View Article and Find Full Text PDF

Ear amputation can leave a devastating deformity; the application of microsurgical replantation techniques has allowed very favorable aesthetic outcomes when successful. We report a case of ear replantation in a child in whom a venous repair was not performed; instead medicinal leeches were used to decompress the ear in the immediate postoperative setting. This represents the third reported case of successful ear replantation without microsurgical venous anastomosis.

View Article and Find Full Text PDF

We describe the use of a "lacing apparatus" across large and complex wounds to accomplish wound closure. This technique utilizes the principles of tissue expansion (exploiting inherent extensibility of the skin, mechanical creep, and biologic creep) but is able to employ them in situations in which traditional tissue expansion (utilizing implantable expanders) is not practical. After preparation, the wounds are laced with large nylon suture, which is tightened on a daily basis, typically allowing closure of even massive wounds within 8 to 10 days.

View Article and Find Full Text PDF

It is generally accepted that replanted digits surviving at least 1 week following surgery rarely succumb to ischemic necrosis. Presented here are 2 patients who experienced late digital replantation failure. The first patient is an 8-year-old boy who had his index finger replanted at the proximal phalangeal level.

View Article and Find Full Text PDF

In recent years, electrodiagnostic studies have become an expected component in the work up and evaluation of carpal tunnel syndrome. We conducted a retrospective review of 460 carpal tunnel decompressions to determine whether the accuracy of diagnosis and the prediction of therapeutic outcome could be related to the positivity and severity of findings on preoperative electrical studies. The 349 patients (460 hands) were divided into two groups: group 1 consisted of hands with the clinical diagnosis of carpal tunnel syndrome but with normal electrodiagnostic studies (n = 62); in group 2 the hands had a clinical diagnosis of carpal tunnel syndrome with confirmatory electrodiagnostic studies (n = 398).

View Article and Find Full Text PDF