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Biomedical subjects

W M Glasoe

Publications and source records attributed to W M Glasoe.

8 recordsLinked to original sources
PubMed2001

First ray dorsal mobility in relation to hallux valgus deformity and first intermetatarsal angle.

The hypermobile first ray has been implicated as contributing to the cause and progression of hallux valgus deformity. Deformity of the hallux is often accompanied by an enlarged first intermetatarsal (IM 1-2) angle. It has been hypothesized that subjects having an abnormally large IM 1-2 angle have laxity of the first ray. Objectives of this study were to compare dorsal mobility of the first ray in subjects with hallux valgus to asymptomatic controls, and to investigate the relationship between dorsal mobility and the IM 1-2 angle. Fourteen subjects (age 23-81) with hallux valgus were matched by gender and age to control subjects. The IM 1-2 angle was measured from radiographs. A load-cell device measured dorsal mobility of the first ray under a standard load of 55 N. Pearson's correlation coefficient identified a marginal correlation (r = .51) between IM 1-2 angle and dorsal mobility. An independent t-test showed a statistically (P < 0.01) larger amount of dorsal mobility in the group of subjects having hallux valgus. Mobility of the first ray was increased in subjects with hallux valgus and a large IM 1-2 angle may be an indicator of increased dorsal mobility.

Adult↗
PubMed2000

The reliability and validity of a first ray measurement device.

The need for measuring the mobility of the first ray has been identified. The purpose of this study was to test the reliability and validity of a device built to measure the relative vertical displacement of the first ray. Twenty fresh frozen cadaver feet were sampled (mean age of donor was 70+/-13 years). Dorsal mobility of the first ray was measured by device over three trials of repeated loading using 20 N, 35 N, 55 N and 85 N of force. Radiographs served as the criterion standard for validation of the device. Vertical displacement was measured from x-ray by a digitizing procedure that recorded movement of the first ray during loading. Reliability of the device assessed by intraclass correlation coefficients (ICC) was .98 with standard errors of the measurement calculated to be 0.35 mm. A correlation of agreement value of .97 was determined for the two methods of measurement. Analysis of variance testing found a significant interaction between force and method of measurement. Tukey post-hoc analysis found no difference (F<1.70) between the two methods of measuring first ray displacement in cadaver specimens when the force applied did not exceed 55 N. At 85 N of force (F = 10.05), unwanted movement of the second metatarsal caused the device to overestimate the amount of displacement that occurred specific to the first ray. This measure of first ray mobility should help clinicians and researchers to better investigate foot pathology resulting from faulty mechanics of the first ray.

Aged↗
PubMed2000

Comparison of first ray dorsal mobility among different forefoot alignments.

STUDY DESIGN: Experimental design using 1-way analysis of variance and regression analysis to test the influence of 3 forefoot alignments on the dorsal mobility of the first ray. OBJECTIVES: To determine the effect of forefoot alignment on the magnitude of first ray dorsal mobility to an imposed load and to describe any association between forefoot alignment and age on dorsal mobility of the first ray. BACKGROUND: Instability of the first ray has been implicated as a primary mechanical etiology of many foot problems. It has been proposed that a relationship exists between forefoot alignment and mobility of the first ray, with a varus aligned forefoot contributing to the development of an unstable first ray. METHODS AND MEASURES: Sixty female (n = 34) and male (n = 26) subjects aged 18-77 were assigned into valgus, neutral, and varus foot groups (20 per group) based on a clinical measurement of forefoot alignment. A load cell device measured dorsal mobility of the first ray under a standard load of 55 N. Within-day repeat measures were taken from a subsample of subjects. In addition to reliability analysis, analysis of variance and regression analyses tested the relationship between forefoot alignment, age and sex, and mobility of the first ray. RESULTS: The forefoot valgus group demonstrated significantly less dorsal mobility of the first ray than neutral or varus groups. The varus and neutral groups were not significantly different from one another. Forefoot alignment and sex were significant linear predictors (R2 = 0.40) of first ray dorsal mobility. Age had no significant association to dorsal mobility of the first ray. CONCLUSION: Subjects having a valgus aligned forefoot had less dorsal excursion of the first ray than subjects having a neutral aligned forefoot. This investigation provides evidence supporting a relationship between forefoot alignment and mobility of the first ray.

Adolescent↗
PubMed2000

Metrecom measurement of navicular drop in subjects with anterior cruciate ligament injury.

OBJECTIVE: Research suggests that excessive pronation of the foot contributes to the incidence of anterior cruciate ligament (ACL) tears by increasing internal tibial rotation. Studies have documented greater navicular drop values in individuals with a history of an ACL tear using methods that may not accurately follow the motion of underlying bone. The purpose of our investigation was to compare the navicular drop of subjects with a history of ACL tears with healthy controls when measured by a Metrecom. SUBJECTS: Eighteen subjects previously diagnosed with a torn ACL were matched by age, sex, and limb to noninjured control subjects. DESIGN AND SETTING: Static group comparisons of navicular drop in subjects with an injured ACL and subjects having no history of ACL injury. MEASUREMENTS: A single investigator performed the measure of navicular drop. The position of the navicular tuberosity was digitized while the subject stood barefoot on a flat surface in subtalar joint neutral and in relaxed stance. Intrarater reliability was assessed using intraclass correlation coefficient and standard error of the measurement. An independent t test assessed the difference between the amount of navicular drop in the ACL group and the controls. RESULTS: Analysis of repeated measures, intraclass correlation coefficient (2,1), demonstrated intrarater reliability for the measure of navicular drop to be 0.90; the standard error of measurement was 1.19 mm. The independent t test showed a statistically greater amount of navicular drop in the ACL group. CONCLUSIONS: Excellent intrarater reliability was demonstrated when using the Metrecom to measure navicular drop. Excessive subtalar joint pronation, measured as navicular drop, was identified as 1 factor that may contribute to ACL injury.

Journal Article↗
PubMed1999

Measuring first ray mobility with a new device.

First ray hypermobility has been linked to many abnormal conditions in the foot. First metatarsal vertical displacement is proportional to the measurement of first ray dorsiflexion. A new device that measures first ray mobility has been built and tested. The device applies a dorsiflexing force to the head of the first metatarsal and measures the amount of vertical displacement that results. The design and instrumentation of the device is described. A safe and reliable testing procedure for measuring maximal first ray displacement is discussed. Clinicians could use this measure when selecting treatment options for patients who suffer foot pathologies resulting from faulty mechanics of the first ray.

Biomechanical Phenomena↗
PubMed1999

Weight-bearing immobilization and early exercise treatment following a grade II lateral ankle sprain.

STUDY DESIGN: Case study. OBJECTIVES: To describe a protocol used in the rehabilitation of a grade II lateral ankle sprain, emphasizing brief immobilization with a removable boot, weight bearing as tolerated, and progression of early exercise. BACKGROUND: The optimum conservative treatment of severe grade II ankle sprains remains undefined. Short-term benefits of early mobilization have won favor over immobilization by casting; however, pain and ankle joint instability often linger. The timing of weight bearing as a variable that influences recovery has largely been ignored when either treatment is considered. METHODS AND MEASURES: The patient was a 17-year-old girl who had sustained a left ankle inversion sprain while playing high school basketball. The sprained ankle was placed in an immobilizer boot for 1 week, and weight bearing was encouraged. She received instructions for active exercise and for resistive exercise with elastic tubing. Volumetric and active range of motion measurements and gait observation provided indicators of rehabilitation progress. A digital inclinometer was used to measure active range of motion in the sagittal plane. Vertical ground reaction forces recorded with an instrumented treadmill documented gait symmetry. RESULTS: The patient responded well to the course of treatment, returning to full participation in basketball 2 weeks after the injury. The injured ankle had 29% (19 degrees) less active range of motion than the nonimpaired ankle at the beginning of physical therapy. The injured ankle also displaced 50 mL more water compared with the nonimpaired ankle at the start of treatment. Four weeks after beginning treatment, the sprained ankle had 4 degrees less active range of motion and displaced 5 mL more water compared with the nonimpaired ankle. As a college athlete, the patient has remained free of subjective complaints of ankle pain, instability, and swelling. CONCLUSION: Weight-bearing immobilization combined with early exercise provided safe and effective treatment for this patient, who suffered a grade II lateral ankle sprain.

Adolescent↗
PubMed1998

Measurement of dorsal mobility in the first ray: elimination of fat pad compression as a variable.

Previous designs for a device to measure first ray mobility have included compression of the first metatarsal fat pad as part of the measurement of displacement or have failed to standardize the force applied to the head of the first metatarsal. In this investigation, assessment of vertical mobility of the first ray of both feet in 14 volunteers was determined using a device that applied dorsiflexing force to the first metatarsal. First ray displacement was measured initially from the plantar surface and then from the dorsal aspect of the head of the first metatarsal. The difference between plantar- and dorsal-surface-measured vertical displacement was highly significant. This study suggests that mobility of the first ray measured from the dorsal aspect of the first metatarsal head eliminated compression of the plantar fat pad from being interpreted as part of the measurement of displacement.

Adipose Tissue↗