Perrin Roland, Launois Thomas, Brogniez Laurent, Desbrosse Francis G, Coomer Richard P, Clegg Peter D, Reda Ayalu A, Gehin Simon G, Vandeweerd Jean-Michel E
Clinique Equine Desbrosse, St. Lambert-des-Bois, France.
Vet Surg. 2010 Dec;39(8):1030-6. doi: 10.1111/j.1532-950X.2010.00749.x. Epub 2010 Nov 15.
To assess the reliability of computed tomography (CT) to identify the direction of implant insertion for cortical screws along the longitudinal axis of intact (nonfractured) distal sesamoid bones.
In vitro study.
Cadaveric paired equine forelimbs (n=16).
Insertion of a cortical screw in lag fashion along the longitudinal axis of intact (nonfractured) distal sesamoid bones was evaluated in 2 groups (3.5 and 4.5 mm) of 8 paired limbs. In each group, the direction of the distal sesamoid bone was determined by CT (Equine XTC 3000 pQCT scanner). Screw placement was verified by specimen dissection. Implant direction was considered satisfactory if the entire screw length was within the distal sesamoid bone and not damaging the articular or flexural surfaces.
In our sample and according to our criteria, the proportion of satisfactory direction of screws was 0.63 (5/8) for 4.5 mm implants, and 0.87 (7/8) for 3.5 mm implants.
CT is a useful imaging modality to identify anatomic landmarks for insertion of a 3.5 mm cortical screw in the distal sesamoid bone.
评估计算机断层扫描（CT）在确定皮质骨螺钉沿完整（未骨折）远籽骨纵轴植入方向时的可靠性。
体外研究。
尸体配对马前肢（n = 16）。
在8对肢体的2组（3.5毫米和4.5毫米）中，评估沿完整（未骨折）远籽骨纵轴以拉力螺钉方式植入皮质骨螺钉的情况。在每组中，通过CT（Equine XTC 3000 pQCT扫描仪）确定远籽骨的方向。通过标本解剖验证螺钉放置情况。如果整个螺钉长度位于远籽骨内且未损伤关节面或屈面，则认为植入方向满意。
在我们的样本中，根据我们的标准，4.5毫米植入物的螺钉方向满意比例为0.63（5/8），3.5毫米植入物为0.87（7/8）。
CT是一种有用的成像方式，可用于确定在远籽骨中植入3.5毫米皮质骨螺钉的解剖标志。
