Mechanical loading caused by physical activity can stimulate bone formation and strengthen the skeleton. Estrogen receptors (ERs) play some role in the signaling cascade that is initiated in bone cells after a mechanical load is applied. We hypothesized that one of the ERs, ER-beta, influences the responsiveness of bone to mechanical loads. To test our hypothesis, 16-wk-old male and female mice...

INTRODUCTION Detailed anatomical knowledge of the distal end of the ulna plays a pivotal role in understanding post-injury instability and painful conditions at the distal radioulnar joint (DRUJ), which can be due to avulsion of the ulnar styloid process or ulnar styloid triquetral impaction syndrome. With this in mind, data on the morphological features of distal ulnae in the Indian population...

We describe a patient who sustained a displaced isolated intra-articular fracture of the distal ulna, causing limitation of rotation of the forearm. The extent of displacement of the fracture which was not evident on plain radiographs was revealed by CT. The fracture was reduced and internally fixed using a standard technique applicable to the fixation of fractures of the radial head. Full move...

The report describes a rare case of giant cell tumour of proximal end of ulna occurring in 22 years old lady. Pain and gradual increase in swelling was noticed for last 7 months. X-ray showing complete absorption of proximal ulna. The tumour was excised en-bloc; reconstruction by fibular graft and fusion of elbow in functional position was performed. Postoperatively neurovascular status was nor...

This article reviews acute dislocations of the distal radioulnar joint (DRUJ) and distal ulna fractures. Acute dislocations can occur in isolation or in association with a fracture to the distal radius, radial metadiaphysis (Galeazzi fracture), or radial head (Essex-Lopresti injury). Distal ulna fractures may occur in isolation or in combination with a distal radius fracture. Both injury patter...

A common distal radio-ulnar joint (DRUJ) stabilisation procedure uses a tendon graft running from the lip of the radial sigmoid notch to the ulnar fovea and through a bony tunnel to the ulnar shaft, before being wrapped round the distal ulna and sutured to itself. Such graft fixation can be challenging and requires a considerable tendon length. The graft length could be reduced by fixing the gr...

Radial head dislocation associated with plastic bowing of the ulna is classified as a Monteggia equivalent lesion. This injury in children can be treated by closed reduction, but manipulative reduction may not completely correct plastic bowing of the ulna. We encountered two cases of incomplete reduction in which the radial head was reduced in a supination position, but redislocated during rota...

The fossil record of Australian dinosaurs in general, and theropods in particular, is extremely sparse. Here we describe an ulna from the Early Cretaceous Eumeralla Formation of Australia that shares unique autapomorphies with the South American theropod Megaraptor. We also present evidence for the spinosauroid affinities of Megaraptor. This ulna represents the first Australian non-avian therop...

On in vitro incubation of articular and epiphysial cartilage of the ulna of the domestic pig 70 to 80 per cent of [U-14C] glucose was metabolised to 14C-lactate, but cartilage of the epiphysial plate produced up to five times as much 14C-CO2 as articular cartilage, and the specific radioactivity of 14C(or 35S)-chondroitin 4(6)-sulphate isolated from epiphysial cartilage (following 35S-sulphate ...

We experienced two patients with osteofibrous dysplasia of the ulna. Both of them showed typical radiographic findings of osteofibrous dysplasia, except for location. One patient underwent surgery at the age of 15 years to confirm the diagnosis histologically. Although the tumor recurred 5 months after the surgery, expansion of the lesion seemed to cease at the age of 25 years. In the other pat...