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Biomedical subjects

R Kerr

Publications and source records attributed to R Kerr.

At least 73 records · Page 4Linked to original sources
PubMed1985

Osteoarthritis of the glenohumeral joint: a radiologic-pathologic study.

Cadaveric specimens and patient radiographs were examined in order to establish the pattern and the distribution of degenerative alterations of the glenohumeral joint. Characteristic osseous changes occur in response to alterations in the articular cartilage and rotator cuff. The extent of these changes is underestimated by plain-film radiography. A strong association was found between the changes of osteoarthritis (OA) and those related to deterioration of the rotator cuff. Idiopathic OA of the glenohumeral joint was discovered in 10 (20%) of 50 symptomatic patients age 60 years and over. Theories regarding the pathomechanics and interrelations between glenohumeral joint OA and rotator cuff deterioration are discussed.

Aged↗
PubMed1985

Motor skill acquisition by individuals with Down syndrome.

Motor skill acquisition of subjects with Down syndrome on a pursuit tracking task was assessed in comparison to groups of mentally retarded subjects without Down syndrome and nonretarded subjects matched for functional age and chronological age (CA). Thirty-seven male subjects performed eight trials on a subject-paced pursuit tracking task. The main finding was that subjects with Down syndrome did not respond to directional probability in the same manner shown by the retarded or the nonretarded subjects matched for CA or functional age. This difference in strategy was also reflected in their greater emphasis on accuracy rather than speed. Finally, these effects were consistent across the subjects with Down syndrome despite the large intersubject variability seen in their performance.

Adolescent↗
PubMed1984

Digital arthrography of the wrist: a radiographic-pathologic investigation.

An analysis of digital arthrography of the wrist was accomplished in 10 cadaveric specimens. In each case, images were obtained during a 30-sec period in which a small amount of contrast material was introduced into the radiocarpal compartment; films were reviewed with and without subtraction technique. Pathologic examination of the sectioned specimens documented the accuracy of this arthrographic method. The sequence of contrast opacification of the various compartments of the wrist and the location and size of the defects within ligamentous and cartilaginous structures were ideally seen with digital arthrography. A previously unemphasized pattern of communication, that between the midcarpal and pisiform-triquetral compartments, was seen in two instances. Digital wrist arthrography seems to represent an excellent method to evaluate the patient with suspected soft-tissue injury.

Fluoroscopy↗
PubMed1984

Complications of the Angelchik antireflux prosthesis.

Various complications have been reported recently for the Angelchik antireflux prosthesis, a silicone-gel prosthesis used in the treatment of gastroesophageal reflux and associated hiatal hernia. We have studied the cases of 11 patients with complications of this prosthesis and have reviewed the literature for others. Complications included 8 erosions of the device into the gastrointestinal tract, 1 migration, 1 improper placement, and 1 case believed to be surgical trauma. These complications represent those typical to reflux surgery and some unique to the Angelchik prosthesis (migration and erosion). The exact frequency is unknown, with the manufacturer estimating migration at 0.81% and erosion at 0.15%. Available data indicate that complications may occur up to several years after implantation, and physicians may not recognize the problems with the prosthesis if they are unaware of the complications.

Adult↗
PubMed1983

Communication through physical activity for learning disabled children.

To measure the extent to which an integrated program of motor and cognitive tasks might enhance the learning disabled children's motor and basic cognitive skills, a treated group of 8 had three 1/2-hr. sessions per week for 6 mo. 8 control subjects continued regular physical education and reading programs with their classroom teacher. All subjects were tested before and after 6 mo. Over-all the treated group showed greater improvement on tests of both motor and cognitive skills than the control group. This study suggests a physical activity program can influence basic cognitive skills as well as motor skills.

Child↗
PubMed1982

Practice variability and longer and short retention intervals.

This experiment compared the effect of different practice schedules on distance and direction errors in a blindfolded two-dimensional movement. The three experimental groups, (a) criterion target only, (b) varied targets (not criterion), (c) single target (not criterion) and one control group (rested), were tested immediately after the "practice" session without knowledge of results and were tested again after a 1-wk. retention interval. The distance data demonstrated little difference among the three experimental groups, but all three groups were significantly better than the control group. However, there was little difference in errors of direction among the groups. While the data for distance support a schema interpretation of movement control, the data for direction appear to reflect the concept of a visual-spatial map being used to guide movements.

Distance Perception↗
PubMed1978

Specific and varied practice of motor skill.

To assess the potential effect of specific and varied practice on the development of motor schema, 64 children in two age groups (8 yr. and 12 yr.) were tested on a simple throwing task at the beginning and end of a 12-wk. physical education program. For the throwing test the children were assigned to either a specificity or a schema group (varied practice). The task was performed without visual feedback, but knowledge of results was given after each trial. Prior to both tests at the criterion target, the specific group was given practice throws using the criterion target distance, whereas the schema group practiced on two other targets. No differences were found between the two groups at the beginning of the program but on the posttest those children receiving a variety of practice on the throwing task performed significantly better than the specific-practice group. Thus it was suggested that a varied practice schedule may facilitate the initial formation of motor schema, and this process may be enhanced by participation in a physical education program.

Child↗
PubMed1975

Movement control and maturation in elementary-grade children.

Serial tapping by 5-, 7- and 9-yr.-old boys and girls, as measured by Fitts' Law, was recorded. 60 Ss performed a reciprocal tapping task and were assessed developmentally via hand-wrist X-rays. No significant relationship was found between the fine motor task and skeletal age. The results of the motor task suggest an improvement in movement time, with age, due to an ability to plan subsequent movements rather than simply an increase in speed of arm movement.

Age Factors↗