The purpose of this study was to compare cup position, jump distance, and rate of dislocations in 100 total hip arthroplasty (THA) cases performed with the direct anterior approach (DAA) and 100 cases performed with the posterior approach (PA). Abduction and anteversion angles were measured using Martell Hip Analysis software. The average cup anteversion in… (More)
A carbon black transference technique was used to determine the contact area in twenty-three dissected tibiotalar articulations, with the talus in neutral position and displaced one, two, four, and six millimeters laterally. The greatest reduction in contact area occurred during the initial one millimeter of lateral displacement, the average reduction being… (More)
Twenty-eight principal dancers and soloists from America's two most famous ballet companies were examined for anthropometric measurements, including flexibility, muscle strength, and joint range of motion. Both male and female dancers were flexible, but not hypermobile, and did not differ significantly from each other. Marked differences were found between… (More)
Cuboid subluxation is a common but poorly recognized condition. Its symptoms include lateral midfoot pain and an inability to "work through the foot." In addition, pressing on the plantar surface of the cuboid in a dorsal direction produces pain. The normal dorsal/plantar joint play is reduced or absent when compared to the uninjured side, and subtle… (More)
Posterior tibial tendon tears in dancers are uncommon. No case series of such injuries has been presented. The injury does however occur, and should be differentiated from the more common causes of medial hindfoot symptoms in dancers. The relevant anatomy, biomechanics, and differential diagnosis are presented followed by a summary of four cases.
Live streaming is an emerging form of social media, which affords sharing and participating in rich experiences. Through these experiences, live streams often serve as places supporting the formation of online communities. Meanwhile, MOOCs are rapidly expanding the scope and reach of online learning. However they struggle to engage students in participatory… (More)
Posterior ankle pain in dancers and equinus athletes is often caused by the extreme plantarflexion requirements of their activity. Differentiation between true posterior ankle pain and Achilles tendon pain is discussed. Signs and symptoms of posterior ankle pain are specific to the flexor hallicus tendon on the medial side or impingement when on the lateral… (More)