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Biomedical subjects

Sara L Edwards

Publications and source records attributed to Sara L Edwards.

3 recordsLinked to original sources

Dog and cat bites to the hand: treatment and cost assessment.

PURPOSE: To assess the demographic patterns, clinical morbidity, and treatment costs associated with domestic animal bites to the hand. METHODS: A retrospective review was performed on 111 patients who suffered either a dog or cat bite to the hand. Demographic data were collected for both the patient and the animal involved. RESULTS: The patient population had suffered 71 dog bites and 40 cat bites. Two scenarios were identified that increased the likelihood of a bite: (1) attempting to separate fighting animals and (2) attempting to aid an injured animal. More than half of the victims (61 of 111) were bitten by an animal with which they were familiar. Bite injuries ranged from relatively minor wounds to major injuries that included open fractures, persistent deep infection including osteomyelitis, nerve laceration, tendon laceration, or tissue loss. Approximately two thirds of patients required hospital admission at least for intravenous antibiotics. Approximately one third of animal bite victims required at least 1 surgical procedure. Thirteen patients required long-term intravenous antibiotics and/or multiple surgeries and incurred medical expenses in excess of dollar 77,000. CONCLUSIONS: Domestic animal bites to the hand are common injuries that can produce considerable morbidity. Stray animals did not account for the majority of incidents. Bite prevention strategies should focus on careful handling of animals that are fighting or injured. Animal bite wounds often require intravenous antibiotics and hospitalization and the cost of care for deep infections can be enormous. Our patient population was selected from a small geographic area over a relatively short collection period, suggesting that domestic animal bite injuries may represent a major public health issue. TYPE OF STUDY/LEVEL OF EVIDENCE: Prognostic, Level IV.

Adolescent↗

Two-part surgical neck fractures of the proximal part of the humerus. A biomechanical evaluation of two fixation techniques.

BACKGROUND: Successful internal fixation of fractures of the surgical neck of the humerus can be difficult to achieve because of osteopenia of the proximal aspect of the humerus. The purpose of this study was to compare the biomechanical stability of a proximal humeral intramedullary nail and a locking plate for the treatment of a comminuted two-part fracture of the surgical neck in a human cadaver model. METHODS: Twenty-four cadaveric humeri were instrumented with use of either a titanium proximal humeral nail (PHN) or a 3.5-mm locking compression plate for the proximal part of the humerus (LCP-PH). The specimens were matched by bone mineral density and were separated into four experimental groups with six humeri in each: PHN bending, LCP-PH bending, PHN torsion, or LCP-PH torsion. Comminuted fractures of the surgical neck were simulated by excising a 10-mm wedge of bone. Bending specimens were cyclically loaded from 0 to 7.5 Nm of varus bending moment at the fracture site. Torsion specimens were cyclically loaded to +/-2 Nm of axial torque. The mean and maximum displacement in bending, mean and maximum angular rotation in torsion, and stiffness of the bone-implant constructs were compared. RESULTS: In bending, the LCP-PH group demonstrated significantly less mean displacement of the distal fragment than did the PHN group over 5000 cycles (p = 0.002). In torsion, the LCP-PH group demonstrated significantly less mean angular rotation than did the PHN group over 5000 cycles (p = 0.04). A significant number of specimens in the PHN group failed prior to reaching 5000 cycles (p = 0.04). The LCP-PH implant created a significantly stiffer bone-implant construct than did the PHN implant (p = 0.007). CONCLUSIONS: The LCP proximal humeral plate demonstrated superior biomechanical characteristics compared with the proximal humeral nail when tested cyclically in both cantilevered varus bending and torsion. The rate of early failure of the proximal humeral nail could reflect the high moment transmitted to the locking proximal screw-bone interface in this implant. CLINICAL RELEVANCE: The high failure rate in torsion of the proximal humeral nail-bone construct is concerning, and, with relatively osteoporotic bone and early motion, the results could be poor.

Adult↗

Infant and child motor development.

Identifying infant and child developmental delay is a skill important for orthopaedic surgeons to master because they often are asked to distinguish between normal and abnormal movement. An emphasis has been placed on early detection and referral for intervention, which has been shown to enhance the lives of the infant or child and his or her family. Appropriate recognition of delay is necessary for referral to early intervention services, which serve to help these children overcome or improve motor dysfunction and to help families grow more confident in caring for children with special needs. We define early intervention, discuss normal and abnormal motor development, and provide useful examination tools to assess motor development.

Age Factors↗