Pathoanatomy of the Jones Fracture in Male University Soccer Players.

Background: Jones fractures are relatively common in soccer players and require an extended recovery period because this type of fracture has a high incidence of delayed union, nonunion, and refracture. There has been some previous research on risk factors for Jones fracture, but no study has yet investigated the effect of the length of the fifth metatarsal bone and the positional relationship of the articular surface of the fifth metatarsal bones and the tarsal bones. Clarification of the characteristics of the foot structure that predispose soccer players to Jones fracture may aid in the prevention of this injury.

Closed reduction of a posterior sternoclavicular joint dislocation: A case report.

Sternoclavicular joint dislocation (SCJD) is a rare injury; there are only two reported cases of SCJD that have occurred during judo practice. We present a case of an 18-year-old male athlete who fell while practicing judo and experienced upper left chest pain. He was diagnosed with posterior SCJD at another institute before being transferred to our hospital.

Effect of Changes in Artificial Turf on Sports Injuries in Male University Soccer Players.

Background: Studies comparing the types and severity of trauma and injuries caused by different types of field surfaces have been conducted. However, there have been no studies on sports injuries caused by temporal deterioration of long-pile artificial turf fields and related decreases in the rubber chip and silica sand infill.

Purpose: To investigate the influence of an artificial turf field on sports injuries in a university soccer team.

Pathogenesis of Fifth Metatarsal Fractures in College Soccer Players.

Background: The pathogenesis of fifth metatarsal stress fractures remains uncertain.

Hypothesis: Physical characteristics and environmental factors, which have received limited attention in the literature thus far, might be involved in the development of fifth metatarsal stress fractures.

Study Design: Case-control study; Level of evidence, 3.

Individuality and reproducibility in high-speed motion of volleyball spike jumps by phase-matching and averaging.

For analysis of knee injuries in volleyball, we developed a system to obtain kinematic waveforms about the high-speed motion of volleyball spike jumps that could examine their individuality and reproducibility, with phase-matching and averaging. The form of six female players was recorded in two sessions of ten jumps each, with a video motion-analysis system, VICON, at the sampling frequency of 240 Hz. To identify individual jump characteristics despite differences from jump to jump, we averaged up to ten data sets with phases matched.