Bull Hosp Jt Dis Orthop Inst, 4 (1943), pp. The wrist series examines the carpal bones (scaphoid, lunate, triquetrum, pisiform, trapezium, trapezoid, capitate and hamate), the radiocarpal joint and the distal radius and ulna. Google Scholar. An alternative mechanism of palmar trapezoid dislocation is postulated to occur by forced hyperextension of the wrist . L Peretti, C MassazzaAn unusual case of dislocation of the trapezoid bone. Isolated dislocation of the trapezoid bone. The second Dislocation of the trapezoid is a very uncommon injury. J Bone Joint Surg [Am] 72: 446–448 . Two weeks after injury, he presented at our hospital with mild swelling on the dorsal radius of the right wrist and tenderness at the snuff box. Below is a systematic approach to interpretation. Wrist views are requested when injury to the distal radius/ulna or carpal bones are suspected. J Hand Surg, 5 (1980), pp. The bones of wrist and hand collectively form the wrist. Looking through that, one can see the convexity of the scaphoid. We report a rare variant with no concomitant injury to the metacarpals or carpal bones. 602-604. We report a case of combined volar trapezium dislocation and dorsal trapezoid dislocation with other concomitant injuries. A 29-year-old man sustained injury when he hit the back of his right hand hard on a steel shelf while running in a dark warehouse. This injury is caused by direct or indirect trauma that results in posterior disloca-tion in the majority of cases. Dislocation of the trapezoid has been reported in 30 patients; fractures are seen even less frequently and usually go with dorsal displacement. The authors report two cases of isolated, undisplaced, fractures of the trapezoid bone. This row is closely approximated to the metacarpal bones. The proximal surface has a triangular smooth and convex facet, articulating with the distal end of the radius [3]. It is associated with other bony or ligamentous injuries in the wrist. Anatomy . J Hand Surg 5: 602–604. Fall on an outstretched hand; Sports injuries; Vehicular accidents ; Physical combat; Direct hit … Late presentation of trapezoid dislocation may include avascular necrosis. Because of its well-protected position in the wrist, traumatic lesions of the trapezoid bone are rare. Google Scholar 9. J Hand Surg1980;5:874-8. The proximal surface of the trapezium, in combination with the surface of the trapezoid, forms a slightly concave facet for articulating with the distal surface of the scaphoid [11]. Isolated fractures of the trapezoid bone have been rarely reported in the literature, the mechanism of injury being an axial or bending load transmitted through the second metacarpal. The shape and size of this bone and its location below the thumb cause the integrity of the trapezium to deteriorate over time. Axial dislocation and fracture dislocation. The lunate acts as a central anchor for the carpal bones. fracture or dislocation. 6. Chir Organi Mov (Bologna), 65 (1979), pp. If the dislocation includes the trapezium, trapezoid, and the first and second metacarpals, then it is termed peritrapezoid peritrapezium axial radial dislocation (Figs 1d, 7). Displacement of any of these bones may result in Wrist Dislocation. Because of its well-protected position in the wrist, traumatic lesions of the trapezoid bone are rare. The distal row consists of the hamate, capitate, trapezoid and trapezium. It is conservatively treated without dislocation. metacarpal bone was dorsally subluxed and had migrated proxi- Thirty-three cases of this injury have been previously de- mally. The trapezium also touches two other bones in the wrist joint, the scaphoid and trapezoid bones. 36-40. Isolated fractures are rarely seen and usually related to the high energy trauma. The trapezoid is shaped like a wedge. Dorsal dislocation of the lesser multan-gular. The anatomy of each bone will be examined here, and then the basic anatomy of the STT joint will be described to help the reader understand the genesis of STT arthritis. Dislocation of the either the trapezium or the trapezoid are both rare injuries, even among carpal dislocations. The patient was placed in a sugar-tong splint and given orthopedic follow up. The structure of the trapezoid bone forms a firm, stationary joint with the second metacarpal base. We report a case of combined volar trapezium dislocation and dorsal trapezoid dislocation with other concomitant injuries. 89-92 . The trapezoid-metacarpal joint dislocation is a rare event because of the stability of the joint,1-8) and there are only few case reports in the literature. Fractures of the capitate can be part of a greater arch perilunate injury or a consequence of a crush injury to the wrist with multiple bones involved. The lunate bone is central join of carpal bones. 11. ... Avascular necrosis after treatment of trapezoid dislocations may occur as the bone is often enucleated with no soft tissue attachments, but this does not preclude a good result [5, 8, 26, 30, 31, 38, 47]. The carpus is held together by firm ligaments which envelope the carpal bones and protect it from damage. Case Report. MA Meyn, AM RothIsolated dislocation of the trapezoid bone. Scaphoid Bone Articular Surface Anatomy. PMID: 18984327 [Indexed for MEDLINE] Publication Types: Case Reports; MeSH … Google Scholar. A variant of this injury also involving a fracture of the trapezoid is termed transtrapezoid peritrapezium axial radial fracture dislocation . 10. Distally from the scaphoid is the trapezium. The eight carpal bones that form the wrist joint are named as the Capitate, Trapezoid, Hamate, Pisiform, Trapezium, Lunate, Scaphoid and Triquetrum. [2] It is also called the lesser multangular bone. Lunate is the semilunar bone that fits in the distal radius. Google Scholar 10. Rhoades CE, Reckling FW (1983) Palmar dislocation of the trapezoid. Arthrodesis is recommended over excision because the latter may lead to metacarpal migration and subsequent carpal arthritis. Gelberman RH, Panagis JS, Taleisnik J, Baumgaertner M. The arterial anatomy of the car-pus: part II – the intraosseous vascularity. We report a new combination of these injuries where fracture-dislocation of the base of the 1st metacarpal bone occurred simultaneously with a comminuted fracture of the trapezium, dislocation of the trapezoid and metacarpal joints (2nd to 5th) and an avulsion fracture of the hamate. A trapezoid is constrained and received external force without being dispersed, so it is possible that the axial load to the second metacarpal bone by punching was transmitted to the scaphoid via the trapezoid, leading to the fractures. The scaphoid links the two rows of carpals. J Hand Surg 8: 85–88. A trapezoid fracture is a break in the trapezoid bone of the wrist. trapezoid bone and the strong ligament attachments with adjacent bones. The trapezium articulates with two of the carpal bones, the scaphoid, and the trapezoid as well as with the first metacarpal bone [7].. To date, few articles have been published on isolated trapezoid fractures. The trapezium is located most radially. The trapezoid bone is one of eight carpal bones that forms part of the wrist joint. The condition may also be accompanied by ligament and nerve damage. There were also mild radial subluxations of the third and fourth metacarpals. The carpal bones are scaphoid, pisiform, trapezium, lunate, trapezoid, capitate, triquetrum, and hamate. We report an unusual variant of a palmar trapezoid dislocation with a shearing fracture of the dorsal cortex treated with mini-fragment screw fixation. We present the case of a 50-year-old worker, who sustained a crush injury of his left hand with a dorsal fracture dislocation of the trapezoid bone and the associated second metacarpal bone at the STT, and a concomitant compartment syndrome of the hand. A review of the literature regarding trapezium and trapezoid dislocations as well as the treatment of these injuries is presented. Dislocation of the either the trapezium or the trapezoid are both rare injuries, even among carpal dislocations. The scaphoid bone is joined with both rows of carpal bones. The square bone that bridges the proximal and distal half of the wrist is the pisiform. Mechanisms of injury have typically been reported as an axial load, with or without forced wrist flexion/extension, that is transmitted from the second metacarpal indirectly to the trapezoid. Stein AH Jr (1971) Dorsal dislocation of the lesser multangular bone. Computed tomography obtained due to concern for an occult fracture revealed a comminuted fracture of the trapezoid bone involving the articular surface with an anteriorly displaced bone fragment (Figures 1 and 2). We report a case of an isolated, nondisplaced trapezoid fracture that was sustained by direct trauma and subsequently treated successfully in a short-arm cast. Palmar dislocation of the trapezoid is a rare injury, which results from substantial trauma to the wrist. The trapezoid bone (lesser multangular bone) is a carpal bone in tetrapods, including humans. Axial fractures and dislocations can be complicated by associated neurovascular, muscular, and/or tendinous injury. Hyperextension of the either the trapezium or the trapezoid bone are rare AM dislocation... Fits in the wrist, traumatic lesions of the trapezium or the trapezoid (... That resembles the trapezium also touches two other bones in the wrist joint, scaphoid. 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