Three-dimensional architecture of intraosseous vascular anatomy of the hamate: a micro-computed tomography study / 北京大学学报(医学版)

OBJECTIVE@#To obtain three-dimensional intraosseous artery of the hamate and to provide the vascular anatomy basis of hamate fracture fixation.@*METHODS@#PbO (lead monoxide, Sinopharm Chemical Reagent Beijing Co. Ltd) was ground into particles less than 40 μm and suspended in turpentine oil (Chemical Reagent Beijing Co. Ltd) at ratios of 1 g : 1.5 mL, 1 g : 1 mL and 1 g : 0.5 mL. Three specimens were investigated. Brachial arteries were cannulated and perfused with lead-based contrast agent. Hamates were harvested and scanned using micro-computed tomography (microCT). The acquisition protocols were as follows: CT scan setup: total rotation [Degrees], 360; rotation steps, 360; X-ray detector setup: transaxial, 2048; axial, 2048; exposure time, 1 500 ms, Binning, 1; system magnification: high-med. X-ray tube setup: 80 kV, 500 mA current. The down-sampling factor used in the reconstruction was 2. The effective voxel size of the final image was 27.30 μm. The three-dimensional model of the hamate was generated and the distribution and pattern of vessels were evaluated.@*RESULTS@#There were abundant extraosseous vessels around the hamate. They were mainly running in the tendons and ligaments around the hamate. Four vascular zones were identified on the hamate surface. They were on the palmar platform of the hamate body, on the dorsal side, on the ulnar side and on the tip of hamulus, namely. There were anastomoses among 4 vascular zones. We did not observe any vessels penetrating through the articular cartilage. The extraosseous vessels of the vascular zones gave a number of intraosseous branches into the hamate. The hamate body received intraosseous blood supply from the dorsal, palmar and ulnar while the hamulus from the palmar, ulnar and hamulus tip. There were some intraosseous branches anastomosing with each other.@*CONCLUSION@#The extraosseous and intraosseous vessels of the hamate were more than what used to be considered. The hamate body and hamulus received blood supply from multiple directions and arteries anastomosed extensively both outside and inside the hamate, making it possible that the intraosseous perfusion survived after fracture. It is likely that the nonunion after the hamate fracture is not caused by the vascular damage but the malalignment of the fragments.

Escisión de la apófisis unciforme del hueso ganchoso / Uncinate process of hamate excision in non-union

Introducción: Las fracturas del gancho del ganchoso son raras, su diagnóstico suele ser tardío y la falta de consolidación es frecuente. Materiales y métodos: Entre 1988 y 2005 fueron operados 14 pacientes que presentaban ausencia de consolidación de la apófisis unciforme mediante su ablación. Se evaluó el tiempo desde el traumatismo y el diagnóstico, los estudios complementarios realizados y la presentación clínica. Todos los pacientes fueron tratados mediante la ablación del gancho del ganchoso. Los resultados fueron evaluados mediante el Mayo Modified Wrist Score. Para la evaluación estadística de los datos se utilizó la prueba de la t de Student. Resultados: El tiempo promedio transcurrido entre el comienzo de las manifestaciones clínicas y el diagnóstico fue de 9 meses (rango 3 a 204 meses). Ocho pacientes presentaron muy buen resultado (57,2 por ciento), 4 bueno (28,6 por ciento), 1 regular (7,1 por ciento) y 1 malo (7,1 por ciento). De los 11 deportistas, 10 volvieron a su nivel anterior. No hubo complicaciones significativas. Conclusiones: La ablación del gancho del ganchoso es una excelente alternativa terapéutica en casos de ausencia de consolidación de la fractura y permite una rápida reinserción a las actividades cotidianas.

Fratura de stress do gancho do hamato: relato de caso com ênfase aos achados de imagem / Stress fracture of hamate's hook: case report with emphasis to the imaging findings

As fraturas de stress do gancho do hamato estão geralmente associadas com atividades esportivas que utilizam tacos, raquetes e bastões. Devido à ausência de um trauma óbvio, o diagnóstico exige maior conhecimento desta lesão e alto índice de suspeição. Os autores relatam o caso de um jogador de golfe com fratura de stress do gancho do hamato, com diagnóstico e acompanhamento realizados por ressonância magnética e tomografia computadorizada multislice.

Stress fractures of the hook of the hamate are related to sports that use devices such as golf clubs, rackets and baseball bats. Because usually there is no history of obvious trauma, the diagnosis necessitates better knowledge of the lesion and high index of suspicion. The authors report a case of stress fracture of the hook of the hamate in a golf player with diagnosis and follow-updone with magnetic resonance and multislice computer tomography.