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Biomedical subjects

Henry G Chambers

Publications and source records attributed to Henry G Chambers.

8 recordsLinked to original sources

Pain, fatigue, and school functioning in children with cerebral palsy: a path-analytic model.

OBJECTIVE: This study tests a model of how pain and fatigue, independently or in combination, relate to school functioning in pediatric cerebral palsy (CP). METHODS: One hundred eighty-nine parents of children with CP completed the Pediatric Quality of Life Inventory (PedsQL) 4.0 Generic Core Scales and the PedsQL 3.0 Cerebral Palsy Module. Seventy-three children with CP completed the PedsQL. Path-analytic and mediational techniques were utilized to test the a priori model. RESULTS: Data from both parent proxy-report and child self-report were found to have acceptable model fit. Results supported the existence of an indirect relationship between diagnostic subtypes and school functioning that was partially mediated by both pain and fatigue. CONCLUSIONS: Pain and fatigue represent potentially modifiable targets for interventions designed to improve school functioning in children with CP.

Achievement↗

The PedsQL in pediatric cerebral palsy: reliability, validity, and sensitivity of the Generic Core Scales and Cerebral Palsy Module.

This investigation determined the measurement properties of the Pediatric Quality of Life Inventory (PedsQL) 3.0 Cerebral Palsy (CP) Module. PedsQL 4.0 Generic Core Scales and 3.0 CP Module were administered to 245 families. Mean age of the 134 males and 107 females was 8 years 1 month (SD 4y 4mo; range 2-18y). The sample included children with hemiplegia (n=55), diplegia (n=84), and quadriplegia (n=85). Twenty eight children had a Gross Motor Function Classification System classification at Level I, 40 at Level II, 86 at Level III, 43 at Level IV, and 37 at Level V. Reliability was demonstrated for the PedsQL 4.0 (alpha=0.86 child, 0.89 parent) and CP Module (alpha=0.79 child, 0.91 parent). The PedsQL 4.0 distinguished between healthy children and children with CP. Construct validity of the CP Module was supported. Sensitivity of the PedsQL was demonstrated among children with different diagnostic categories and gross motor function.

Adolescent↗

Structural and mechanical alterations in spastic skeletal muscle.

Spasticity, a neurological problem secondary to an upper motor neuron lesion, has a significant effect on skeletal muscle. The upper motor neuron lesions may be secondary to a cerebral vascular accident, head injury, spinal cord injury, or degenerative diseases such as multiple sclerosis, or perinatal brain injuries such as cerebral palsy. Functional ability in these patients can be severely compromised but the basic mechanisms underlying these deficits are not clearly understood. In this review we evaluate the current evidence in the literature that suggests that skeletal muscle tissue itself is altered in spastic conditions. Experimental studies were evaluated that included a variety of methods encompassing joint mechanics, tissue mechanics, and muscle morphology. Taken together, the literature strongly supports the assertion that 'spastic muscles' are altered in a way that is unique among muscle plasticity models and inconsistent with simple transformation due to chronic stimulation or disuse. Further studies are required to detail the intra- and extracellular modifications of skeletal muscle that occur secondary to spasticity so that novel therapeutic treatments can be developed for this impairment.

Biomechanical Phenomena↗

The effect of surgical delay on acute infection following 554 open fractures in children.

BACKGROUND: Traditional recommendations hold that open fractures in both children and adults require urgent surgical debridement for a number of reasons, including the preservation of soft-tissue viability and vascular status as well as the prevention of infection. Following the widespread use of early administration of antibiotics, a number of single-institution studies challenged the belief that urgent surgical debridement decreases the risk of acute infection. METHODS: We performed a retrospective, multicenter study of open fractures that had been treated at six tertiary pediatric medical centers between 1989 and 2000. The standard protocol at each medical center was for all children to be given intravenous antibiotics upon arrival in the emergency department. The medical records of all children with open fractures were reviewed to identify the location of the fracture, the interval between the injury and the time of surgery, the Gustilo and Anderson classification, and the occurrence of acute infection. RESULTS: The analysis included 554 open fractures in 536 consecutive patients who were eighteen years of age or younger. The overall infection rate was 3% (sixteen of 554). The infection rate was 3% (twelve of 344) for fractures that had been treated within six hours after the injury, compared with 2% (four of 210) for those that had been treated at least seven hours after the injury; this difference was not significant (p = 0.43). When the fractures were separated according to the Gustilo and Anderson classification system, there were no significant differences in the infection rate between those that had been treated within six hours after the injury and those that had been treated at least seven hours after the injury. Specifically, these infection rates were 2% (three of 173) and 2% (two of 129), respectively, for type-I fractures, 3% (three of 110) and 0% (zero of forty-four), respectively, for type-II fractures, and 10% (six of sixty-one) and 2% (two of thirty-seven), respectively, for type-III fractures (p > 0.05 for all three comparisons). CONCLUSIONS: In the present retrospective, multicenter study of children with Gustilo and Anderson type-I, II, and III open fractures, the rates of acute infection were similar regardless of whether surgery was performed within six hours after the injury or at least seven hours after the injury. The findings of the present study suggest that, in children who receive early antibiotic therapy following an open fracture, surgical debridement within six hours after the injury offers little benefit over debridement within twenty-four hours after the injury with regard to the prevention of acute infection.

Acute Disease↗

Health-related quality of life of children and adolescents with cerebral palsy: hearing the voices of the children.

The aim of the study was to determine whether pediatric patients with cerebral palsy (CP; 24.3% hemiplegic, 30.4% diplegic, 38.5% quadriplegic) can self-report their health-related quality of life (HRQOL) with the Pediatric Quality of Life Inventory Version 4.0 (PedsQL 4.0) Generic Core Scales. The PedsQL was administered to 148 families (84 males, 64 females; mean 10y, SD 3y 9mo, range 5 to 18y) recruited from a children's hospital clinic and state medical therapy clinics. Sixty-nine children (47%) were able to self-report. Children with CP self-reported a significantly lower HRQOL (mean 65.9) than healthy children (mean 83.8). Children with CP self-reported a similar HRQOL to pediatric cancer patients receiving treatment (mean 68.9). Children diagnosed with quadriplegia (mean 49.4) self-reported more impaired HRQOL than children with diplegia (mean 69.1) and hemiplegia (mean 72.4). Parent-child concordance was lowest for emotional functioning. Providers and parents should obtain the children's HRQOL perceptions whenever possible.

Adolescent↗

Ankle and foot disorders in skeletally immature athletes.

As one of the most commonly injured areas in the immature athlete, the foot and ankle has many disorders. Knowledge of congenital and developmental abnormalities and possible injury patterns enables the clinician to correctly diagnose these disorders. Physical examination and appropriate use of imaging technology provide confirmation of the initial impression. As children and adolescents participate in sports with greater intensity, there is a higher incidence of overuse injuries that may have long-term implications.

Adolescent↗

A practical guide to gait analysis.

The act of walking involves the complex interaction of muscle forces on bones, rotations through multiple joints, and physical forces that act on the body. Walking also requires motor control and motor coordination. Many orthopaedic surgical procedures are designed to improve ambulation by optimizing joint forces, thereby alleviating or preventing pain and improving energy conservation. Gait analysis, accomplished by either simple observation or three-dimensional analysis with measurement of joint angles (kinematics), joint forces (kinetics), muscular activity, foot pressure, and energetics (measurement of energy utilized during an activity), allows the physician to design procedures tailored to the individual needs of patients. Motion analysis, in particular gait analysis, provides objective preoperative and postoperative data for outcome assessment. Including gait analysis data in treatment plans has resulted in changes in surgical recommendations and in postoperative treatment. Use of these data also has contributed to the development of orthotics and new surgical techniques.

Adult↗

Progressive slippage after pinning for slipped capital femoral epiphysis.

The authors retrospectively reviewed seven cases of progressive slipped capital femoral epiphysis after screw fixation. All seven patients initially presented with chronic symptoms, and five had an acute exacerbation of symptoms with the appearance of an acute-on-chronic slip. Of the other two, one had obvious motion at the proximal femoral physis and the other had increased symptoms but did not have an obvious acute slip radiographically. All underwent percutaneous screw fixation. In four patients a single screw was placed, and in three patients two screws were placed. No patient became symptom-free after surgery. Slip progression was noted on average 5 months after treatment. Radiographs in all patients revealed an increase in slip severity and loss of screw purchase in the femoral neck while fixation in the proximal femoral epiphysis remained secure. One patient had hypothyroidism and another Cushing disease, both diagnosed after the slipped epiphysis. Slips occurring in children with underlying endocrinopathies, and unstable slips in children with a history of antecedent knee or hip pain (commonly called an acute-on-chronic slip) may be susceptible to screw fixation failure. In such patients, close radiographic follow-up, particularly in the presence of continued symptoms, is required to document slip progression and fixation failure as soon as possible.

Bone Screws↗