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Biomedical subjects

J M Fritz

Publications and source records attributed to J M Fritz.

At least 19 recordsLinked to original sources
PubMed2001

A comparison of fear-avoidance beliefs in patients with lumbar spine pain and cervical spine pain.

STUDY DESIGN: A prospective consecutive cohort study of patients with cervical spine pain and patients with lumbar spine pain referred to an academic medical center. OBJECTIVES: To investigate the presence of fear-avoidance beliefs in a sample of patients with cervical spine pain and to compare the association of pain intensity, disability, and fear-avoidance beliefs in patients with cervical spine pain with that in patients with lumbar spine pain. SUMMARY OF BACKGROUND DATA: Fear-avoidance beliefs are a specific psychosocial variable involved in the development of disability from low back pain. Psychosocial variables are believed to play a role in cervical disability, but specific variables have not been investigated. METHODS: Consecutive patients referred to a multidisciplinary center completed self-reports of disability, pain intensity, and fear-avoidance beliefs during an initial evaluation session. Gender, type of symptom onset, acuity, and payer source were also recorded. Associations between disability, pain intensity, and fear-avoidance beliefs were investigated in patients with cervical spine pain and patients with lumbar spine pain. RESULTS: In all, 163 patients completed the self-reports and were included in this study. Weaker relations between fear-avoidance beliefs and disability were found in patients with cervical pain than in those with lumbar pain. Significant differences in fear-avoidance beliefs were found for gender, type of symptom onset, and payer source (workers' compensation, auto insurance, and traditional insurance). CONCLUSION: The associations among fear-avoidance beliefs, pain intensity, and disability differed between patients with cervical spine pain and patients with lumbar spine pain. Fear-avoidance beliefs were significantly different in subgroups of patients.

Adult↗
PubMed2001

A comparison of a modified Oswestry Low Back Pain Disability Questionnaire and the Quebec Back Pain Disability Scale.

BACKGROUND AND PURPOSE: The quality of a disability scale should dictate when it is used. The purposes of this study were to examine the validity of a global rating of change as a reflection of meaningful change in patient status and to compare the measurement properties of a modified Oswestry Low Back Pain Disability Questionnaire (OSW) and the Quebec Back Pain Disability Scale (QUE). SUBJECTS: Sixty-seven patients with acute, work-related low back pain referred for physical therapy participated in the study. METHODS: The 2 scales were administered initially and after 4 weeks of physical therapy. The Physical Impairment Index, a measure of physical impairment due to low back pain, was measured initially and after 2 and 4 weeks. A global rating of change survey instrument was completed by each subject after 4 weeks. RESULTS: An interaction existed between patients defined as improved or stable based on the global rating using a 2-way analysis of variance for repeated measures on the impairment index. The modified OSW showed higher levels of test-retest reliability and responsiveness compared with the QUE. The minimum clinically important difference, defined as the amount of change that best distinguishes between patients who have improved and those remaining stable, was approximately 6 points for the modified OSW and approximately 15 points for the QUE. CONCLUSION AND DISCUSSION: The construct validity of the global rating of change was supported by the stability of the Physical Impairment Index across the study period in patients defined as stable by the global rating and by the decrease in physical impairment across the study period in patients defined as improved by the global rating. The modified OSW demonstrated superior measurement properties compared with the QUE.

Activities of Daily Living↗
PubMed2001

Examining diagnostic tests: an evidence-based perspective.

Diagnosis is an important aspect of physical therapist practice. Selecting tests that will provide the most accurate information and evaluating the results appropriately are important clinical skills. Most of the discussion in physical therapy to date has centered on defining diagnosis, with considerably less attention paid to elucidating the diagnostic process. Determining the best diagnostic tests for use in clinical situations requires an ability to appraise evidence in the literature that describes the accuracy and interpretation of the results of testing. Important issues for judging studies of diagnostic tests are not widely disseminated or adhered to in the literature. Lack of awareness of these issues may lead to misinterpretation of the results. The application of evidence to clinical practice also requires an understanding of evidence and its use in decision making. The purpose of this article is to present an evidence-based perspective on the diagnostic process in physical therapy. Issues relevant to the appraisal of evidence regarding diagnostic tests and integration of the evidence into patient management are presented.

Decision Making↗
PubMed2000

The use of nonorganic signs and symptoms as a screening tool for return-to-work in patients with acute low back pain.

STUDY DESIGN: A longitudinal cohort study of patients with acute, work-related low back pain undergoing physical therapy treatment. OBJECTIVE: To determine cut-off values maximizing the predictive ability of the nonorganic signs and symptoms in patients with acute, work-related low back pain and to calculate the predictive validity of the signs and symptoms, alone and in combination, using an outcome of return to work within 4 weeks of initiating treatment. SUMMARY OF BACKGROUND DATA: Waddell et al have proposed nonorganic signs and symptoms as screening tools in patients with chronic low back pain for detecting the presence of abnormal illness behavior and identifying patients in need of further evaluation to improve the likelihood of a successful treatment outcome. METHODS: Consecutive patients referred to physical therapy with work-related low back pain of less than 2 weeks' duration were examined for the presence of nonorganic signs and symptoms before initiating physical therapy treatment. The outcome measure used was the ability to return to work without restrictions within 4 weeks of the initial evaluation. RESULTS: Sensitivity, specificity, and likelihood ratios were calculated for all possible cut-off values for the nonorganic signs, symptoms, and the nonorganic index (signs and symptoms). The best cut-off values were two or more signs (negative likelihood ratio = 0.75), three or more symptoms (negative likelihood ratio = 0.62), and an index score of three or more (negative likelihood ratio = 0.59). Area under a receiver operator characteristic curve for the signs, symptoms, and index were 0.60, 0.63, and 0.63, respectively. CONCLUSIONS: Because the nonorganic tests are purported to serve as screening tests, cut-off values were selected that minimized false-negative results. Even with optimal cut-off values, none of the nonorganic tests served as effective screening tools. Other screening tools may prove more effective for the early identification of patients at increased risk for delay in returning to work after an episode of acute low back pain.

Acute Disease↗
PubMed2000

Interrater reliability of judgments of the centralization phenomenon and status change during movement testing in patients with low back pain.

OBJECTIVE: To determine the interrater reliability of judgments of status change, including the centralization phenomenon during examination of the lumbar spine, and to determine the effects of training and experience on reliability. DESIGN: A videotape study of judgments by physical therapists and physical therapy students of the results of movement testing during the examination of patients with low back pain. SETTING: Outpatient physical therapy clinic. PATIENTS: Patients receiving physical therapy treatment for low back pain. INTERVENTION: Patients with low back pain were videotaped while performing a variety of movement tests including single, repeated, and sustained movements. Forty licensed physical therapists and 40 physical therapy students were provided with operational definitions of the three potential judgments of status change with movement testing; centralization, peripheralization, status quo. All therapists and students viewed the videotape and made a judgment regarding the patient's status change in response to the test. MAIN OUTCOME MEASURE: Percentage agreement and kappa coefficient values for agreement. RESULTS: Interrater reliability was excellent for the total sample of examiners (kappa = .793), for the licensed physical therapists (kappa = .823), and for the students (kappa = .763). CONCLUSIONS: Judgments of status change are reliable when operational definitions are provided. Clinical experience does not appear to substantially improve reliability.

Adult↗
PubMed2000

The use of a classification approach to identify subgroups of patients with acute low back pain. Interrater reliability and short-term treatment outcomes.

STUDY DESIGN: A prospective, consecutive, cohort study of patients with acute low back pain classified into subgroups based on examination data and treated with a specific treatment approach. OBJECTIVE: To calculated the interrater reliability of a classification system, and to compare initial patient characteristics and outcomes of physical therapy treatment when a classification approach is used. SUMMARY OF BACKGROUND DATA: Classification of patients with low back pain into homogeneous subgroups has been identified as a research priority. Identifying relevant subgroups of patients could improve clinical outcomes and research efficiency. METHODS: Consecutive patients referred to physical therapy for treatment of acute low back pain were evaluated and classified into one of four subgroups (immobilization, mobilization, specific exercise, or traction) before treatment. Physical therapy treatment was based on the patient's classification. The classifications were compared for initial patient characteristics, frequency and duration of physical therapy, and improvement in Oswestry scores. RESULTS: In this study, 120 patients were evaluated and classified. Analysis of interrater reliability showed a kappa value of 0.56. Differences were found among the classifications for age, initial Oswestry score, history of low back pain, symptom distribution, and average change in Oswestry score with treatment. CONCLUSIONS: Reaching a consensus regarding relevant patient subgroups requires data on the reliability and validity of existing classification systems. Further work is required to validate improvement in treatment outcomes using a classification approach.

Acute Disease↗
PubMed1998

Lumbar spinal stenosis: a review of current concepts in evaluation, management, and outcome measurements.

The purpose of this review is to present current information from the literature regarding the pathoanatomy, clinical presentation, differential diagnosis, treatment, and outcome assessment methods for patients with lumbar spinal stenosis. Lumbar spinal stenosis is a frequently encountered condition, particularly in the elderly. Treatment requires an accurate diagnosis, but differential diagnosis of lumbar stenosis can be difficult. The literature to date has focused primarily on surgical treatment. The long-term efficacy of surgery has been questioned, and surgical procedures are associated with increased costs and risks of morbidity in an elderly population. A trial of conservative care is recommended in most cases, but there are presently no randomized controlled studies in the literature comparing surgical versus conservative management, or evaluating the effectiveness of any specific conservative treatment approach. The existing literature has further been criticized for having poorly defined outcome measures. The assessment of treatment outcomes should be multifactorial, including measures of pathoanatomy and impairments, as well as patient-centered measures such as level of disability, patient expectations, and satisfaction. The present level of understanding of lumbar spinal stenosis is deficient in many areas, including differential diagnosis, treatment, and outcome assessment. Future research should address these deficits to improve the management of patients with this condition.

Arthrodesis↗
PubMed1998

An examination of the selective tissue tension scheme, with evidence for the concept of a capsular pattern of the knee.

BACKGROUND AND PURPOSE: The purpose of this study was to examine whether there is evidence to support 2 elements of the passive-range-of-motion (PROM) portion of Cyriax's selective tissue tension scheme for patients with knee dysfunction: a capsular pattern of motion restriction and the pain-resistance sequence. SUBJECTS: One hundred fifty-two subjects with unilateral knee dysfunction participated. The subjects had a mean age of 40.0 years (SD=15.9, range=13-82). METHODS: Passive range of motion of the knee and the relationship between the onset of pain and resistance to PROM (pain-resistance sequence) were measured, and 4 tests for inflammation were used. Interrater reliability was assessed on 35 subjects. RESULTS: Kappa values for the individual inflammatory tests ranged from .21 to .66 for categorization of the joint as inflamed, based on at least 2 positive inflammatory tests (kappa=.76). Reliability of PROM measurements was indicated by intraclass correlation coefficients of .72 to .97. Reliability of measurements of the pain-resistance sequence was indicated by a weighted kappa of .28. A capsular pattern, defined as a ratio of loss of extension to loss of flexion during PROM of between 0.03 and 0.50, was more likely than a noncapsular pattern in patients with an inflamed knee or osteoarthrosis (likelihood ratio=3.2). An association was found between a capsular pattern and arthrosis or arthritis. CONCLUSION AND DISCUSSION: These findings provide evidence to support the concept of a capsular pattern of motion restriction in persons with inflamed knees or evidence of osteoarthrosis.

Acute Disease↗
PubMed1998

Use of a classification approach to the treatment of 3 patients with low back syndrome.

The purpose of this report is to present the use of a classification system based on signs and symptoms to guide treatment in 3 patients with low back syndrome. Each patient had signs and symptoms of compressive nerve root pathology with a similar anatomical distribution of pain. Each patient was treated with a different approach based on the assigned classification. One patient was classified as needing treatment for a lateral shift, one patient was classified as needing flexion-oriented treatment, and the other patient was classified as needing extension-oriented treatment. The approach used for each patient was successful in reducing patient-reported pain severity and level of functional disability (Modified Oswestry Low Back Pain Questionnaire score). The potential advantages of the use of signs and symptoms to guide treatment classifications and decisions versus decisions based on suspected pathology or symptom distribution are discussed.

Adult↗
PubMed1997

A nonsurgical treatment approach for patients with lumbar spinal stenosis.

The purpose of this case report is to describe a physical therapy approach to the evaluation, treatment, and outcome assessment of two patients diagnosed with lumbar spinal stenosis. Evaluation consisted of assessment of neurological status, spinal range of motion, and lower-extremity muscle force production and flexibility; administration of the Modified Oswestry Low Back Pain Questionnaire and the Roland-Morris Disability Questionnaire; assessment of pain using a visual analog scale; and performance of a two-stage treadmill test. The treatment program was designed to treat the impairments, and harness-supported treadmill ambulation (unloading) was used to address the limitation in ambulation identified by the treadmill test. Outcome assessment included measuring changes in the status of the impairments and assessing responses to the disability questionnaires and performance of the two-stage treadmill test. Improvements were noted on all outcome measures for both patients after 6 weeks of physical therapy and at the 4-week follow-up examination. Larger case series and randomized trials with long-term follow-ups are recommended.

Aged↗
PubMed1997

Preliminary results of the use of a two-stage treadmill test as a clinical diagnostic tool in the differential diagnosis of lumbar spinal stenosis.

This study assesses the ability of a two-stage treadmill test to distinguish stenotic from nonstenotic subjects by capitalizing on the postural dependency of stenotic symptoms. Forty-five subjects (26 stenotic, 19 nonstenotic) participated. An earlier onset of symptoms with level walking (p = 0.0009), increased total walking time on an inclined treadmill (p = 0.014), and prolonged recovery time after level walking (p = 0.001) were significantly associated with stenosis. Only one of four self-reported postural variables were significantly associated with stenosis. Linear discriminant analysis performed using the treadmill variables resulted in the correct classification of 76.9 and 94.7% of stenotic and nonstenotic subjects, respectively. Likelihood ratios for all treadmill variables were > 2.50, and < 2.00 for all self-report variables. A two-stage treadmill test may be useful in the differential diagnosis of lumbar stenosis, and clinical measurement of the postural nature of symptoms seems to be superior to subjects' self-reports.

Adult↗
PubMed1996

Rehabilitation following allograft meniscal transplantation: a review of the literature and case study.

Treatment of meniscal injuries in the knee has evolved over the past three decades. New research regarding the functional roles of the menisci has increased emphasis on the preservation of meniscal tissue. Meniscal transplantation has developed as a surgical technique for individuals whose menisci have been compromised through trauma or previous meniscectomy. The purpose of this article is to review the current literature regarding meniscal function, the deleterious effects of meniscectomy, and the development of transplantation of allograft menisci as a surgical technique. A case study of a 28-year-old male undergoing medial meniscus transplantation is presented, with emphasis on the development of postoperative rehabilitation guidelines.

Adult↗
PubMed1994

Immunochemical detection of the multidrug resistance-associated protein MRP in human multidrug-resistant tumor cells by monoclonal antibodies.

We have generated rat and murine monoclonal antibodies against multidrug resistance-associated protein (MRP), a M(r) 180,000-195,000 membrane glycoprotein involved in a non-P-glycoprotein multidrug resistance of human tumor cells. The antibodies were raised against two different segments of MRP and found to be suitable for protein blot analyses, immunohistochemical and cytochemical studies, as well as flow cytometry of permeabilized cells. The antibodies do not cross-react with the human P-glycoproteins. Immunocytochemistry using MRP-overexpressing tumor cells of different histogenetic origins showed that MRP is predominantly located in the plasma membrane. Immunoelectron microscopy confirmed the plasma membrane location of MRP. The MRP antibodies provide a sensitive and specific tool for studies on MRP-mediated multidrug resistance.

ATP Binding Cassette Transporter, Subfamily B, Mem↗
PubMed1994

The problem and sociocultural context of single-cigarette sales.

OBJECTIVE: To provide data on the sale of single cigarettes to adults and minors and to examine the sociocultural context in which these sales occur. DESIGN: A naturalistic observation study using repeated measures. Two hundred six stores in a convenience sample were visited by one minor and one adult who each attempted to purchase a single cigarette. MAIN OUTCOME MEASURES: Single-cigarette sales to an adult and/or minor. Data were obtained on type of store and, if a sale occurred, on the price, brand, and packaging of the cigarette. The ethnic composition of the neighborhood surrounding each store was determined. RESULTS: One hundred one (49.1%) of the stores sold single cigarettes. Singles were sold significantly more often to minors than to adults, and when both could make a purchase, minors paid more for these singles than did adults. Singles were least likely to be sold in white neighborhoods, more likely to be sold in integrated neighborhoods, and most likely to be sold in minority neighborhoods. Minors were able to purchase single cigarettes during 34.4% of the visits to white neighborhoods but could do so during 71.2% of the visits to minority neighborhoods; adults were able to make similar purchases during 24% of the visits to white neighborhoods and 37.3% of the visits to minority neighborhoods. CONCLUSIONS: The illegal sale of single cigarettes involves complex sociocultural factors heretofore unexamined. An understanding of such factors may be useful in planning merchant education programs and drafting policy to control illegal sales.

Adolescent↗
PubMed1994

Preventing cigarette sales to minors: the need for contextual, sociocultural analysis.

BACKGROUND. Interventions designed to stop retailers from selling cigarettes to minors have been based on the untested and implicit hypothesis that the sole purpose of these sales is to maximize profits. Interventions have proceeded in the absence of clear empirical evidence that this profit motive alone actually predicts sales; there is no theoretical model regarding when, where, how, and why some retailers decide to sell cigarettes to minors while others do not. We present the first theoretical model of the retailer's decision to sell cigarettes to minors and argue that a variety of contextual and sociocultural variables enter into that decision. We discuss the manner in which this model might be used to improve the effectiveness of future preventive interventions with retailers.

Adolescent↗
PubMed1991

Evidence for a role of the monoclonal antibody E48 defined antigen in cell-cell adhesion in squamous epithelia and head and neck squamous cell carcinoma.

Monoclonal antibody (MAb) E48 recognizes a 20- to 22-kDa antigen expressed by human squamous and transitional epithelia and their neoplastic counterparts. Histochemical examination of these tissues revealed distinct surface labeling with MAb E48. To investigate the subcellular localization of the E48 antigen we have performed electron microscopical analysis. In cells of normal oral mucosa, the E48 antigen was expressed on the plasmalemma, particularly associated with desmosomes, suggesting involvement of the E48 antigen in intercellular adhesion. Furthermore, the level of expression of the E48 antigen appeared to be influenced by the cellular organization. In squamous cell carcinoma (SCC) cell lines grown in vitro as subconfluent monolayer cultures, the E48 antigen expression was low. However, E48 antigen expression increased when SCC cells were grown to confluency. E48 antigen expression was similarly high when SCC cell lines were cultured under conditions promoting three-dimensional growth either as colonies within floating collagen gels or as xenograft in tumor-bearing nude mice. Further evidence for the involvement of the E48 antigen in cell-cell adhesion was found when SCC cells were grown within collagen gels in the presence of MAb E48: no spherical colonies were formed, but cells grew out to colonies composed of single cells. Moreover, in this culture system the percentage of SCC cells growing out to colonies was decreased by the presence of MAb E48. These findings indicate that the E48 antigen is involved in the structural organization of squamous tissue and might have a role in intercellular adhesion.

Antibodies, Monoclonal↗