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Biomedical subjects

C L Highgenboten

Publications and source records attributed to C L Highgenboten.

9 recordsLinked to original sources
PubMed1990

Genucom knee analysis system: reproducibility and database development.

The Genucom is a relatively new computerized system that performs a multidimensional analysis of knee laxity. Therefore, the purposes of the present investigation were twofold: 1) to estimate the reproducibility of the testing system in its ability to obtain similar test values on the same test subject within a back-to-back two-test protocol and 2) to develop a database of normal values as a standard against which values of suspected ligament injury can be compared to reliably determine whether, in fact, ligament injury has occurred. In the reproducibility phase of the study, 20 subjects were tested in two trials each of eight tests, yielding 20 separate test values per trial, accounting for each angle of flexion and plane of force tested. Both legs were tested, providing an N of 40. Test-retest correlations of the two trials and dependent t-tests indicated that the Genucom provided generally stable and reproducible results. In the normal value database phase of the study, 218 different subjects were given one trial of the same eight tests. Testing of both legs provided an N greater than 400. Means and standard deviations were calculated for each test.

Adult↗
PubMed1989

The estimation of femoral condyle size. An important component in osteochondral allografts.

An important component of successful osteochondral allograft surgery of the knee is securing a donor with a femoral condyle (FC) of the appropriate size. The purposes of the present investigation were to analyze the effect of femoral rotation on measurement of FC size and to determine if easily measured variables, such as manual caliper measurements, height, weight, and gender, are useful in matching donors and recipients. Three separate investigations were conducted to accomplish these purposes. The results indicated that femoral rotation has a significant negative effect on accurate sizing of the FC. Height and gender provide an acceptable prediction of femoral condyle size and can be used effectively in the donor selection process.

Body Height↗
PubMed1985

Arthroscopic synovectomy.

Arthroscopic synovectomy of the knee is a technique used for the treatment of the patient whose problems with synovitis and effusion are unsuccessfully treated by nonsurgical means. It offers multiple advantages when compared with open synovectomy but requires attention to detail and the surgeon should follow a set routine. A proven technique and routine are presented.

Arthroscopes↗
PubMed1976

Residual effects of septic arthritis in infancy and childhood.

Septic arthritis affects weight-bearing joints in three fourths of cases. When the disease occurs in infancy, joint dysfunction may not be apparent until many months later. We located 49 children who had had 50 episodes of septic arthritis from 1 1/2 to 12 years earlier (mean, 4.3 years). Thirteen patients (27%) had sequelae, and in eight (16%), there was impairment of ambulation. Residual damage was more common with hip and ankle involvement than with knee joint disease. Sequelae were equally common after Haemophilus influenzae and Staphylococcus aureus infection. Evaluation at the time of hosiptal discharge correctly identified only four of the 13 children with sequelae, and four others who were normal at follow-up had been thought to have permanent damage at discharge. Children with sequelae tended to have been sick longer before diagnosis, and drainage of pus was delayed.

Age Factors↗
PubMedDate not supplied

Concentric and eccentric torque comparisons for knee extension and flexion in young adult males and females using the Kinetic Communicator.

The purposes of this investigation were to establish average leg torque values as a proportion of body weight for both concentric and eccentric contractions for leg extension and leg flexion, to determine leg flexion/extension ratios for both concentric and eccentric contractions, and to compare those values in males and females from ages 15 to 34 years. The Kinetic Communicator (Kin-Com, Chattecx Corp., Chattanooga, TN), a relatively new computerized strength testing device, was used so that both concentric and eccentric torques could be measured. Pilot study results indicated that Kin-Com results were reliable, r greater than 0.88. Average torque, across the full range of motion, and peak torque expressed in newton meters were divided by body weight in kilograms to produce torque values adjusted by body weight. No differences across age or sex were observed for flexion/extension ratios, but the males' weight-adjusted torque values were significantly (P less than 0.01) greater than the females'. Younger (ages 15 to 24 years) male and female subjects produced significantly (P less than 0.01) greater torque for concentric contractions than older subjects (25 to 34 years). In rehabilitation programs using the Kin-Com, the weight-adjusted torque values and flexion/extension ratios will be useful in determining patients' strength recovery from knee or leg injury and/or surgery.

Adolescent↗
PubMedDate not supplied

Genucom, KT-1000, and Stryker knee laxity measuring device comparisons. Device reproducibility and interdevice comparison in asymptomatic subjects.

Generally, three devices (the Genucom Knee Analysis System, the MEDmetric KT-1000 Arthrometer, and the Stryker Knee Laxity Tester), which have been presented in the literature, may be used to assess clinically the amount of knee laxity in an objective manner. This study compared the reproducibility of the anterior and posterior knee laxity values for each and made direct comparisons of the results obtained. Thirty asymptomatic subjects were given a test-retest protocol on both legs with all three devices. Devices were tested in a counterbalanced order. Repeatability of test values within devices was variable, but all were acceptable, the lowest being r = 0.74. Analysis of variance (AN-OVA), and correlational analysis revealed that device-specific anterior and posterior laxity values were produced. We concluded that each commercially available knee laxity testing device can provide reproducible quantitative measurements of knee laxity; however, due to differences in device sensitivities and functional design, numerical results from one device cannot be generalized to another device.

Adult↗
PubMedDate not supplied

The effects of knee brace wear on perceptual and metabolic variables during horizontal treadmill running.

Past research has indicated that runners who wear a Lenox Hill Derotation Brace during treadmill running at 6 mph have an approximate 5% increase in oxygen consumption compared to those who run without the brace. The present study expanded those findings by determining the metabolic and perceptual effects of wearing four commercially available braces while treadmill running at speeds of 6, 7, and 8 mph. The four braces used in this study were the Generation II Poli-Axial Knee Cage, the Orthotech Performer, the CTi Brace, and the Lenox Hill Derotation Brace. Results indicated that the braces caused increases (P less than 0.008) in oxygen consumption, heart rate, and ventilation in the 3% to 8% range compared to running without the brace. Peripheral ratings of perceived exertion were also elevated (P less than 0.001) between 9% and 13%. However, no significant differences were found between the braces. Analysis of covariance indicated the weight of the brace accounted for the increased oxygen consumption during the treadmill runs. We concluded that the braces examined in this study will cause a consistent increase in metabolic cost, which is related to the weight of the braces.

Adolescent↗
PubMedDate not supplied

KT-1000 arthrometer: conscious and unconscious test results using 15, 20, and 30 pounds of force.

A recent published report indicated that the reliability and validity of anterior laxity measurements obtained by using the KT-1000 arthrometer were questionable. The purpose of our study was to examine the diagnostic validity of anterior laxity measurements testing patients in conscious and unconscious states using the KT-1000 arthrometer at 15, 20, and 30 pounds of force. The sample included 68 patients with confirmed anterior cruciate ligament disruption. They were given anterior-posterior drawer tests at 20 degrees in both unconscious and conscious states; measurements were recorded at 15, 20, and 30 pounds of force. The results indicated that the measurements in the unconscious state were significantly higher (P less than 0.01) than the values obtained in the conscious state. The anterior cruciate ligament-disrupted knees produced significantly higher (P less than 0.01) anterior laxity. The difference between anterior cruciate ligament-disrupted knees and normal knees grew significantly larger (P less than 0.01) as force increased. More patients demonstrated a difference greater than 2 mm between anterior cruciate ligament-disrupted knees and normal knees at 30 pounds (81% to 83%) than at 20 pounds (64% to 72%) of force. Seventy-nine percent of the patients demonstrated a compliance index difference greater than 1 mm using 15 and 30 pounds between the normal and anterior cruciate ligament-disrupted knee. These data provide statistical validity for the compliance index and support for the use of anterior laxity measurements at 30 pounds of force. However, approximately 20% of these patients did not demonstrate an anterior cruciate ligament-disrupted-normal knee difference greater than 2 mm or a compliance index difference of greater than 1 mm.

Anterior Cruciate Ligament↗