A5077728814- Sports injuries and prevention
- Knee injuries and reconstruction techniques
- Lower Extremity Biomechanics and Pathologies
- Cardiovascular Effects of Exercise
- Injury Epidemiology and Prevention
- Orthopedic Surgery and Rehabilitation
- Foot and Ankle Surgery
- Total Knee Arthroplasty Outcomes
- Sports Performance and Training
- Winter Sports Injuries and Performance
- Trauma Management and Diagnosis
- Spinal Fractures and Fixation Techniques
- Cardiac Arrest and Resuscitation
- Spinal Cord Injury Research
- Occupational Health and Performance
- Tendon Structure and Treatment
- Traumatic Brain Injury Research
- Bone fractures and treatments
- Shoulder Injury and Treatment
- Muscle activation and electromyography studies
- Advanced MRI Techniques and Applications
- Cardiovascular and exercise physiology
- Cervical and Thoracic Myelopathy
- Traumatic Ocular and Foreign Body Injuries
- Blood transfusion and management
University of California, Irvine
2025
Orthopaedic Center
2013-2024
Uniformed Services University of the Health Sciences
1999-2023
The Centers
2023
Orthopedic Center
2006-2022
Washington University in St. Louis
2022
National Collegiate Athletic Association
2020
Klinikum Lippe
2018
Clinical Orthopaedics and Related Research
2018
Foundation for the National Institutes of Health
2018
ABSTRACT This study examined the mechanisms of anterior cruciate ligament (ACL) injury. In first part study, using a comprehensive, standardized questionnaire, 89 athletes (100 knees) were interviewed about events surrounding their ACL A noncontact mechanism was reported in 71 (72%) knees and contact injury 28 (28%) knees; one patient unsure if there any contact. Most injuries sustained at footstrike with knee close to full extension. Noncontact classified as sudden deceleration prior change...
The mechanisms of anterior cruciate ligament injury in basketball are not well defined.To describe the based on videos situations.Case series; Level evidence, 4.Six international experts performed visual inspection analyses 39 (17 male and 22 female players) situations from high school, college, professional games. Two predefined time points were analyzed: initial ground contact 50 milliseconds later. analysts asked to assess playing situation, player behavior, joint kinematics.There was at...
Background: The combined positioning of the trunk and knee in coronal sagittal planes during non-contact anterior cruciate ligament (ACL) injury has not been previously reported. Hypothesis: During ACL female athletes demonstrate greater lateral abduction angles than ACL-injured male uninjured athletes. Design: Cross-section control-cohort design. Methods: Analyses still captures from 23 (10 7 players 6 controls) or 28 plane videos performing similar landing cutting tasks. Significance was...
Background Most anterior cruciate ligament research is limited to variables at the knee joint and performed in laboratory setting, often with subjects postinjury. There a paucity of information on position hip ankle during noncontact injury. Hypothesis When landing after maneuvers, athletes injury (subjects) show more flatfooted profile flexion than uninjured (controls). Study Design Case control study; Level evidence, 3. Methods Data from 29 videos were compared data 27 controls performing...
Stress fractures are common overuse injuries seen in athletes and military recruits. The pathogenesis is multifactorial usually involves repetitive submaximal stresses. Intrinsic factors, such as hormonal imbalances, may also contribute to the onset of stress fractures, especially women. classic presentation a patient who experiences insidious pain after an abrupt increase duration or intensity exercise. diagnosis primarily clinical, but imaging modalities plain radiography, scintigraphy,...
Heat stroke in athletes is entirely preventable. Exertional heat illness generally the result of increased production and impaired dissipation heat. It should be treated aggressively to avoid life-threatening complications. The continuum includes mild disease (heat edema, rash, cramps, syncope), exhaustion, most severe form, potentially stroke. exhaustion typically presents with dizziness, malaise, nausea, vomiting, or excessive fatigue accompanying temperature elevations. condition can...
Female college basketball and soccer athletes have higher rates of anterior cruciate ligament injury than do their male counterparts. Rates injuries for women men in collegiate lacrosse not been examined. Understanding patterns lacrosse, a full-contact sport noncontact women, could further prevention efforts.Female will decrease over time owing to longer participation sports. Lacrosse be lower possibly beneficial biomechanics carrying stick.Cohort study (Prevalence); Level evidence, 2.Data...
A unique aspect of soccer is the use head for directing ball. The potential resultant injuries has been focus discussions worldwide. Prior work attributed neuropsychologic deficits to cumulative effects heading, without evaluating concussion rates in players. We prospectively studied seven men's and eight women's varsity teams Atlantic Coast Conference during two seasons document incidence. 29 concussions diagnosed over 2 years 26 athletes, 17 (59%) men 12 (41%) women, resulted from contact...
Seventeen normal subjects performed maximal wrist flexion exercise with continuous monitoring of forearm muscle pH and H2PO4-, measured 31P nuclear magnetic resonance, fatigue, expressed as a percentage decline in developed force. Four minutes (flexion duration = 1 s) reduced force from 100 to 74 +/- 9% 6.99 0.04 6.17 0.33 increased H2PO4- 927 401% resting levels. In all subjects, linear relationships were noted between (r 0.90 0.08) -0.89 0.08). Doubling the contraction 2 s produced more...
Catastrophic head injuries in football are rare but tragic events.To update the profile of catastrophic high school and college players to describe relevant risk factors.Case series; Level evidence, 4.We reviewed 94 incidents severe reported National Center for Sports Injury Research during 13 academic years (September 1989 through June 2002).In study period there were an average 7.23 (standard deviation = 2.05) direct scholastic participants per year. There 0.67 100 000 (95% confidence...
Background: Fatalities in football are rare but tragic events. Purpose: The purpose was to describe the causes of fatalities high school and college players potentially provide preventive strategies. Study Design: Descriptive epidemiology study. Methods: We reviewed 243 reported National Center for Catastrophic Sports Injury Research from July 1990 through June 2010. Results: Football averaged 12.2 per year, or 1 100,000 participants. There were 164 indirect (systemic) (average, 8.2 annually...
The secondary school athletic population leads the nation in athletic-related deaths.1–6 Given that many such deaths are avoidable through proper prevention, recognition, and treatment protocols, those involved with athletics can benefit from policy considerations regarding health safety for participation sport. of athletes is paramount, but barriers jeopardize delivery optimal preventive measures remain prevalent across landscape. To date, these "best-practices" recommendations have been...
Background: Recent studies have demonstrated that trunk control likely plays a role in anterior cruciate ligament (ACL) injury. Yet, the majority of ACL research remains focused on lower limb, with limited information position at time Hypotheses: Athletes experiencing noncontact injury after 1-legged landing their center mass (COM) more posterior from base support (BOS) initial ground contact comparison uninjured athletes. The distance COM to BOS (COM_BOS) is larger female, as compared male,...
Patellofemoral disorders are a common cause of knee pain and disability. A thorough history careful physical examination essential to accurate diagnosis, imaging modalities play an important role. Magnetic resonance can provide information on malalignment soft-tissue injuries. Although there is continuum diagnoses, most patellofemoral be divided into three distinct categories: abnormalities, patellar instability due subluxation dislocation, arthritis. Many respond nonoperative therapy. When...
IN BRIEF: An understanding of the etiology and prevention noncontact ACL injuries has lagged behind diagnosis treatment. However, a growing research implicates hormonal, anatomic, environmental, neuromuscular factors that may predispose athletes, particularly women, to these injuries. Specific include estrogen levels, shape intercondylar notch, playing style, control quadriceps hamstring muscles. Prevention programs involve proprioception, plyometrics, strength training, improved jumping,...
Catastrophic cervical spine injuries in football are rare but tragic events.To update the incidence of catastrophic scholastic players and identify new injury patterns.Descriptive epidemiology study.The authors retrospectively reviewed 196 incidents high school collegiate reported to National Center for Sports Injury Research during 13 academic years (September 1989 through June 2002).There were 15.08 direct participants per year, an 1.10 4.72 100 000 college participants, respectively....
We used phosphorus magnetic resonance spectroscopy to study skeletal muscle metabolism of trained vs. untrained humans. The forearms highly rowers (n = 10) and age-matched controls were placed in a 1.9-T magnet so that the wrist flexor muscles over 4-cm transmitting receiving coil. subjects performed work by depressing handle attached an isokinetic ergometer. Relative concentrations Pi, phosphocreatine (PCr), ATP measured along with intracellular pH. Measurements made at rest, during...
The pathophysiology of the myopathy in dysthyroid states is poorly understood. We therefore tested effects thyroid hormones on muscle bioenergetics humans and rats, using vivo 31P NMR. Two hypothyroid patients had: low phosphocreatine to inorganic phosphate ratio (PCr/Pi) at rest, increased PCr depletion during exercise delayed postexercise recovery PCr/Pi. Eight thyroidectomized rats did not show abnormalities but work induced by nerve stimulation resulted a significantly (P less than...
Abstract Objective: To provide certified athletic trainers, team physicians, emergency responders, and other health care professionals with recommendations on how to best manage a catastrophic cervical spine injury in the athlete. Background: The relative incidence of sports is low compared injuries. However, injuries necessitate delicate precise management, often involving combined efforts variety providers. outcome depends efficiency this management process timeliness transfer controlled...