CONTEXT Studies have reported the difference in humeral retroversion (HR) between the dominant and nondominant side in throwing athletes. However, there are few data concerning HR for the rest of the population. In addition, the relationship between HR and external (ER) and internal rotation (IR) at 90 degrees shoulder abduction has not been thoroughly investigated. OBJECTIVES To investigate ...

Background An assessment of the pathoanatomic parameters arthritic glenohumeral joint (GHJ) has potential to identify discriminating metrics differentiate glenoid types in shoulders with primary osteoarthritis (PGHOA). The aim was morphometric differences and threshold values between including normal glenoids various Walch classification. We hypothesized that there would be clear discr...

The current literature on femoroacetabular impingement (FAI) is focused on acetabular orientation and femoral head asphericity, with little emphasis on the effect of version of the femoral neck. A biomechanical model was developed to determine the causative effect, if any, of femoral retroversion on hip contact stress and, if present, delineate the type of FAI with femoral neck retroversion. Fi...

BACKGROUND AND PURPOSE The appearance of acetabular version differs between the supine and weight bearing positions in developmental dysplasia of the hip. Weight bearing radiographic evaluation has been recommended to ensure the best coherence between symptoms, functional appearance, and hip deformities. Previous prevalence estimates of acetabular retroversion in dysplastic hips have been estab...

BACKGROUND AND PURPOSE Acetabular retroversion may result in anterior acetabular over-coverage and posterior deficiency. It is unclear how standard radiographic measures of retroversion relate to measurements from 3D models, generated from volumetric CT data. We sought to: (1) compare 2D radiographic measurements between patients with acetabular retroversion and normal control subjects, (2) com...

background: intra-articular t- type or y- type fractures of the distal end of the humerus are relatively rare, and consequently few surgeons will be able to attain extensive experience with the surgical treatment of these injuries. the current emphasis is on operative intervention with rigid internal fixation and early mobilization. methods: in this prospective and retrospective study, we revie...

BACKGROUND A substantial number of children with an obstetric brachial plexus lesion (OBPL) will develop internal rotation adduction contractures of the shoulder, posterior humeral head subluxations and glenohumeral deformities. Their active shoulder function is generally limited and a recent study showed that their shoulder muscles were atrophic. This study focuses on the role of shoulder musc...

BACKGROUND The success of Total Shoulder Arthroplasty (TSA) is believed to depend on the restoration of the natural anatomy of the joint and a key development has been the introduction of modular humeral components to more accurately restore the patient's anatomy. However, there are no peer-reviewed studies that have reported the degree of glenoid component mal-position achieved in clinical pra...