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Biomedical subjects

Gordon O Matheson

Publications and source records attributed to Gordon O Matheson.

7 recordsLinked to original sources

Infrapatellar plica as a cause of anterior knee pain.

OBJECTIVE: This study seeks to show that in the case of a patient not responding to nonoperative measures for the treatment of anterior knee pain, arthroscopic release of a symptomatic infrapatellar plica can successfully resolve the disability. DESIGN: We report a retrospective study of 12 cases of anterior knee pain not responding to nonoperative treatment that underwent isolated infrapatellar plica resection without other noted knee pathology. SETTING: Patients were evaluated and treated in an outpatient orthopedic sports medicine clinic. PARTICIPANTS: Any patient who presented with anterior knee pain, underwent subsequent arthroscopy, and was treated by isolated resection of the infrapatellar plica was included in the study. INTERVENTION: The surgical procedure involved arthroscopic division of the infrapatellar plica at its attachment on the superior intercondylar notch of the femur. MAIN OUTCOME MEASUREMENTS: Patients were reviewed at least 12 months following the date of surgery. Two subjective knee scales were used to assess knee function. RESULTS: A subjective scale used in prior studies assessing symptomatic medial plica demonstrated 91% percent (11 of 12) excellent (6) or good (5) outcomes at follow-up greater than 1 year. The Knee Injury and Osteoarthritis Outcome Scores of knee function on the subscales of pain, symptoms, activities of daily living, sports activity, and quality of life were 97, 96, 99, 99, and 87, respectively. CONCLUSIONS: These cases demonstrate a potential role for the infrapatellar plica as a cause of anterior knee pain. A prospective study is warranted to measure causality.

Adolescent↗

Preparticipation evaluation: an evidence-based review.

OBJECTIVE: To review available evidence establishing the validity of the preparticipation evaluation (PPE) as a method for screening health risk prior to participation in exercise and sport. Specific emphasis was placed on reviewing original research evaluating methods to screen participants for risk of sudden cardiovascular death. Literature on the current state of the PPE as a screening tool for athletic participation was examined. DATA SOURCES: Electronic databases were searched for articles relating to mass screening for sports participation and sudden cardiac death in athletes published up to January 2004. Databases searched included Medline (OVID Web, 1966-2004), PubMed (1966-2004), Sport Discuss (1975-2004), Current Contents, CISTI Source (1993-2004), Cochrane Database of Systematic Reviews, and EBM Reviews. Additional references from the bibliographies of retrieved articles were also reviewed. SELECTION CRITERIA: All study designs were retrieved, but only those studying athletes and/or student-athletes under age 36 years were reviewed. Of the original research retrieved, the majority of the articles sought to establish incidence or prevalence of cardiovascular causes of sudden death in athletes or the validity of various screening tools. Original research articles seeking to establish the current use of the PPE in all its various forms were also reviewed. All of the articles selected for review consisted of type II, population-based data. DATA EXTRACTION AND SYNTHESIS: The initial literature search identified 639 papers. Of these, 310 articles that met the selection criteria were reviewed, and 25 articles were identified as original research directly relating to the PPE. All of these contained type II evidence-population-based clinical studies. The majority of the literature on the PPE consists of type III evidence-case-based opinion papers and position papers from respected authors and sports medicine societies and reports of expert committees. This literature was also reviewed, but only original research relevant to the PPE is reported in this article. The majority of these studies examined cardiovascular diseases and screening procedures. RESULTS: The 5 studies that assessed the format or effectiveness of the PPE concluded that it was inadequate. The format of the PPE is not standardized and does not consistently address the American Heart Association recommendations for cardiovascular screening history and physical exams. A variety of health care professionals, some without proper training, administer the PPE. The 12 original studies that looked at specific cardiovascular screening techniques were divided on the effectiveness of history, physical examination, electrocardiogram, and echocardiography for detecting cardiovascular risks for sudden death in athletes. CONCLUSIONS: A PPE is required by most sport organizations in America, but research as to its effectiveness is very limited. PPEs have been mandatory in Italy for many years, and we can draw on some the data recorded over this time. Otherwise, very few studies in America or elsewhere have been performed on the PPE process. The research available indicates that the PPE is not implemented adequately or uniformly. An opportunity exists to create a standardized, validated PPE that meets medical standards for quality and provides sensitive, specific screening of potential participants in sport and exercise.

Athletic Injuries↗

Exercise and prostate cancer.

Prostate cancer is a leading cause of cancer morbidity and mortality in men. In addition to improved treatments, strategies to reduce disease risk are urgently required. This review summarises the literature that examines the association between exercise and prostate cancer risk. Between 1989 and 2001, 13 cohort studies were conducted in the US and internationally. Of these, nine showed an association between exercise and decreased prostate cancer risk. Five of 11 case-control studies conducted between 1988 and 2002 reported an association between decreased risk of prostate cancer and high activity levels. Considering all studies performed between 1976 and 2002, 16 out of 27 studies reported reduced risk in men who were most active; in nine out of 16 studies the reduction in risk was statistically significant. Average risk reduction ranged from 10-30%. In aggregate, this evidence suggests a probable link between increased physical exercise and decreased prostate cancer risk. The ability of exercise to modulate hormone levels, prevent obesity, enhance immune function and reduce oxidative stress have all been postulated as mechanisms that may underlie the protective effect of exercise. Exercise may also be of benefit in men undergoing treatment for prostate cancer. Overall, study design and control of potential confounding factors varied greatly among studies, possibly contributing to the variation in results. Epidemiological studies that are better controlled, larger in scale and more carefully designed may help to more fully clarify the relationship between exercise and prostate cancer. In addition, intervention trials that test whether exercise programmes can reduce prostate cancer risk are currently underway to rigorously test the ability of exercise to reduce prostate cancer incidence.

Bone Density↗

Asymptomatic tibial stress reactions: MRI detection and clinical follow-up in distance runners.

OBJECTIVE: The purpose of this study was twofold: to determine if asymptomatic elite distance runners exhibit stress reactions of the tibia on MR images and to determine if the presence of bone stress lesions predicts later development of symptomatic tibial stress injuries. CONCLUSION: Signs of a tibial stress reaction were found on MRI in 43% of the 21 asymptomatic college distance runners in this study. The presence of these changes was not found to be a predictor of future tibial stress reactions or stress fractures. Our findings underscore the importance of correlating MRI findings with clinical findings before making therapeutic decisions.

Adolescent↗

Failure and fatigue characteristics of adhesive athletic tape.

PURPOSE: Athletic tape has been commonly reported to lose much of its structural support after 20 min of exercise. Although many studies have addressed the functional performance characteristics of athletic tape, its mechanical properties are poorly understood. This study examines the failure and fatigue properties of several commonly used athletic tapes. METHODS: A Web-based survey of professional sports trainers was used to select the following three tapes for the study: Zonas (Johnson & Johnson), Leukotape (Beiersdorf), and Jaylastic (Jaybird & Mais). Using a hydraulic material testing system (MTS), eight samples of each tape were compared in three different mechanical tests: load-to-failure, fatigue testing under load control, and fatigue testing under displacement control. Differences in tape microstructure were used to interpret the results of the mechanical tests. RESULTS: Significant differences (P < 0.001) in failure load, elongation at failure, and stiffness were found from failure tests. Significant differences were also found (P < 0.001) in fatigue behavior under both modes of control. As a representative example, in one normalized displacement control fatigue test after 20 min of cycling, 21% (Zonas), 29% (Leukotape), and 57% (Jaylastic) of the mechanical support was lost. After cycling, all tapes loaded to failure showed increased stiffness (P < 0.001), indicating significant energy absorption during cycling. Observed differences in the tapes' microstructure were qualitatively consistent with the measured differences in their mechanical properties. CONCLUSION: In understanding the shortcomings of currently available tapes, the results of these tests can now be used as benchmarks with which to compare and develop future tape designs. Ultimately, these improved tapes should reduce ankle injuries among athletes.

Adhesives↗