Stress Fracture of the Ossification Center of the Scaphoid in a Skeletally Immature Gymnast.

An eleven-year-old male gymnast felt right wrist pain when performing handstands on the floor without any major traumas. Displaced scaphoid fracture was observed on the anteroposterior view of the radiograph. Both on the T1-weighted image from magnetic resonance imaging (MRI) and on the short TI inversion recovery (STIR) image from MRI, low intensity was detected at the middle of the ossification center of the scaphoid and the physis and the articular cartilage covering the scaphoid bone were preserved without any injury.

Biomechanical Differences Between Japanese and American Professional Baseball Pitchers.

Background: Although baseball injuries are common in both Japan and the United States, the majority of pitching injuries in Japanese players occur at the shoulder, whereas most pitching injuries in American players occur at the elbow. A biomechanical comparison between Japanese and American pitchers may help to identify the different injury mechanisms.

Hypothesis: Japanese pitchers produce greater shoulder kinetics whereas American pitchers generate greater elbow kinetics.

Three-dimensional kinematic analysis of throwing motion focusing on pelvic rotation at stride foot contact.

Background: Because the throwing motion can be considered a kinetic chain, pelvic and trunk motion should be included in the analysis. Early pelvic rotation during the throwing sequence has been reported to be a factor leading to overloading of the shoulder and the elbow. A large pelvic rotation angle at the stride foot contact (SFC) was thought to indicate early pelvic opening.

Corrective Step-cut Osteotomy at the Affected Bone for Correction of Rotational Deformity Due to Fracture of the Middle Phalanx.

Malunion at the shaft of the middle phalanx yields less functional problems compared with malunion at the shaft of the proximal phalanx and metacarpal bones. In the present report, the patient sustained a minimally displaced fracture at the distal portion of the distal middle phalanx of the ring finger spraining the finger during playing flag football. Fracture was treated conservatively and fracture union was completed.

Stress fracture of the ulna in a softball pitcher.

Background/aims: We present a rare case of stress fracture of the diaphysis of the ulna in a softball pitcher.

Case: A thirteen-year-old girl felt pain over the distal third of the right forearm during pitching. Stress fracture was detected as callus formation of the ulna before fracture displacement.

Localized naviculocuneiform arthrodesis combined with osteosynthesis of fracture nonunion of the tarsal navicular bone using a locked plating system.

Aims: Navicular fracture is still challenging disorder to treat because there is a risk of nonunion, avascular necrosis and symptomatic osteoarthritis.

Patients Methods And Results: A 40-year-old woman with an ununited fracture of the tarsal navicular bone was treated with localized naviculocuneiform arthrodesis (arthrodesis of the navicular, the middle cuneiform, and the lateral cuneiform). Fusion with the navicular, the middle cuneiform, and the lateral cuneiform as well as union of fracture of the navicular was confirmed on the radiographs.

Surgical treatment of posterior interosseous nerve paralysis in a tennis player.

We report a rare case of posterior interosseous nerve (PIN) paralysis in a tennis player. The PIN, a 2 cm section from a bifurcation point of the radial nerve, presented increased stiffness in the surgical findings and treated with free sural nerve grafting after excision of the degenerative portion of the PIN. We speculate that PIN paralysis associated with hourglass-like constriction can be caused and exacerbated by repetitive forearm pronation and supination in playing tennis.

Increased horizontal shoulder abduction is associated with an increase in shoulder joint load in baseball pitching.

Background: Soft tissues of the shoulder undergoes substantial stresses due to humeral head movement, and this may contribute to throwing shoulder injuries in baseball pitchers. Prevention and management of throwing shoulder injuries critically rely on reduction of shear force at the shoulder joint. However, the amount and direction of the force applied to the shoulder during the throwing motion have not been clarified.

Treatment of stress fracture of the olecranon in throwing athletes with internal fixation through a small incision.

The present study is a report of retrospective case series of stress fracture of the olecranon. Six patients presented posterior elbow pain in throwing in baseball and softball, but fracture was not diagnosed in radiographs. We detected stress fracture of the olecranon using computed tomographic (CT) scan and treated the patient with internal fixation with a headless cannulated double threaded screw through a small skin incision.