John C. Jacobs

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BACKGROUND Knee injuries account for approximately one third of injuries in skiers. Researchers have proposed several mechanisms of knee injury in skiers. However, the frequencies of these mechanisms have varied in different studies. PURPOSE To identify the most common knee injury mechanisms in recreational downhill skiers and to assess injury frequencies(More)
BACKGROUND Soccer has one of the highest incidences of anterior cruciate ligament (ACL) injuries for both males and females. Several injury prevention programs have been developed to address this concern. However, an analysis of the pooled effect has yet to be elicited. PURPOSE To conduct a systematic review and meta-analysis of ACL and knee injury(More)
BACKGROUND Osteochondritis dissecans (OCD) is a disorder of subchondral bone and articular cartilage whose incidence in children is not clearly known. PURPOSE The purpose of this study was to assess the demographics and epidemiology of OCD of the knee in children. STUDY DESIGN Descriptive epidemiology study. METHODS A retrospective chart review of an(More)
BACKGROUND Understanding the relationship of the posterior cruciate ligament (PCL) and the lateral collateral ligament (LCL) to the femoral and tibial physes is important to reducing the risk of physeal injury during surgical reconstruction. The purpose of this study was to identify the location of the attachments of the PCL and LCL in skeletally immature(More)
BACKGROUND Osteochondritis dissecans (OCD) of the ankle is a disorder of the talar or distal tibial subchondral bone and articular cartilage whose incidence in children is not clearly known. PURPOSE To assess the demographics and epidemiology of OCD of the ankle in children. STUDY DESIGN Descriptive epidemiologic study. METHODS A retrospective chart(More)
BACKGROUND Examination of value in health care has become a national priority in the United States. Regional variation in health care costs is an area of focus among national policy experts. Procedural cost data can be used to provide physicians with information to evaluate costs and value. PURPOSE To perform a cost review for anterior cruciate ligament(More)
BACKGROUND The frequency of osteochondritis dissecans (OCD), a disorder of the subchondral bone and articular cartilage, is not well described. PURPOSE To assess the frequency of pediatric OCD lesions that progress to surgery based on sex, joint involvement, and age. STUDY DESIGN Descriptive epidemiology study. METHODS A retrospective chart review(More)
BACKGROUND Osteochondritis dissecans (OCD) is a vexing condition for patients, parents, and physicians because of the frequent slow healing and nonhealing that leads to prolonged treatment. Several features on plain radiographs have been identified as predictors of healing, but the reliability of their measurement has not been established. PURPOSE To(More)
BACKGROUND The anterolateral ligament (ALL) of the knee has been identified as a structure that limits internal rotation, and thus, affects the pivot shift mechanism. It has previously been reported in a high percentage of adult subjects. The purpose of the current study was to evaluate whether the ALL could be identified on pediatric cadaveric knee(More)
BACKGROUND Although many etiological theories have been proposed for osteochondritis dissecans (OCD), its etiology remains unclear. Histological analysis of the articular cartilage and subchondral bone tissues of OCD lesions can provide useful information about the cellular changes and progression of OCD. Previous research is predominantly comprised of(More)