Perilunate dislocations are a devastating injury to the carpus that carry a guarded long-term prognosis. Mayfield type 4 perilunate dislocations are rare, high-energy injuries that carry a risk for avascular necrosis (AVN) of the lunate. When AVN ensues and the carpus collapses, primary treatment with a proximal row carpectomy or arthrodesis has been advocated. This case reports a successful cl...

Wrist ligaments are crucial structures for the maintenance of carpal stability. They are classified into extrinsic ligaments, connecting the carpus with the forearm bones or distal radioulnar ligaments, and intrinsic ligaments, entirely situated within the carpus. Lesions of intrinsic and extrinsic ligaments of the wrist have been demonstrated to occur largely, mostly in patients with history o...

A new porcellanid crab, Petrolisthes uruma sp. nov., is described based on a single specimen collected from Okinawajima Island in the Ryukyus, southwestern Japan. The unique holotype was collected from a subtidal depth of 10 m, though vast majority of the genus occur in intertidal to shallow subtidal zone. The new species is morphologically closest to P. noluccensis (De Man, 1888), but is disti...

Severe injuries involving the carpus are often characterized by multiple fractures of the various carpal bones with accompanying joint instability. Most such injuries can be managed successfully utilizing aggressive internal fixation techniques, with reasonably good prognosis for a pasture sound animal, satisfactory for breeding purposes. Author’s address: Elgin Veterinary Hospital, Inc., PO Bo...

THE PATIENT A 37-year-old man injured his right wrist in a motor vehicle collision. In the emergency department he had severe wrist pain and median nerve paresthesia. Wrist radiographs identified a dorsal perilunate dislocation (PLD) with the carpus dislocated dorsally and the lunate tilted volar but still located in the lunate fossa. Post-reduction computed tomography scan confirmed no fractures.

Hands, especially lunatum, are involved very rarely with osteoid osteoma. This report presents an osteoid osteoma of the lunatum, which was previously misdiagnosed as Kienböck's disease and had undergone surgery. Magnetic resonance imaging may lead the clinician to misdiagnose because of the excessive bone edema around the carpus. The operation should be planned according to radiography and com...