Applied Anatomy And Biomechanics Of The Distal Radioulnar Joint

Objectives: The purposes of the present study are as follows: (I) Anatomic study of the triangular fibrocartilage complex(TFCC) was performed to attempt to provided detail anatomic information of the TFCC and a foundation for future biomechanical experiments. (I)The extrinsic and internal blood supply of the TFCC was examined. The vascular pattern of the TFCC is highly interesting in regard to its healing possibilities and in particular to the selectivity of its operative methods. biomechanical cadaver study of the DRUJ was performed to determine the function of the stabilizing structure of the DRUJ and to define the role of the dorsal and palmer radioulnar ligaments (DRUL and PRUL) and the distal interosseous membrane (d-IOM) in DRUJ during forearm movement. These findings may help the clinician to better understand the function of these structures and the clinical signs of their injury.㏕he four soft tissue reconstruction procedures to restore initial static stabiLity to the unstable DRUJ or the unstable resected distal ulna (RDU) were compared. Objective information regarding the mechanical performance of these proceduces was obtained. The purpose was to assess the ability of the four reconstruction proceduces to restore initial static stability to the unstable DRUJ or the RDU. o evaluate the effect of resected TFCC and several operative procedures on ulnar support of the carpus, changes in force transmission to the ulnar were measured using pressure sensitive film in axially loaded cadaver arms. The therapeutic mechanisms of these operations were investigated. iomechanical study of the new operative procedure proposed by author was undertaken to intend to lay the foundation of its future clinical application. Methods: The following methods were used: (DIn upper limb specimens of adult human cadavers, anatomical structures of the TFCC were studied by gross dissect, and extrinsic and internal blood supply of the TFCC recorded by means of black ink and red latex injections through humors artery. In 6 fresh wrists, the entire articular disks were dissected out, taking care to preserve the paradisiacal tissues. These disks were embed in paraffin and 5-to? micron thick sections were cut. Radial, ulnar, and dorsalpalmer planes were stained with hematoxylin and eosin and examined under light microscopy. @) 16 upper extremities were taken from fresh young adult cadavers and divided into 2 groups. The first group was used for the evaluation of the effects on DRUJ stability of three structures of the DRTJJ. The second group was used to assess the ability of four reconstruction procedures to restore initial static stability to the unstable DRUJ or the RDU. For these studies, a jig was designed by author to rigidly hold an upper extremity and yet allow forearm rotation to be varied. Calipers were used to measure the relative motion of the radius with respect to the ulna. According as the amount of the relative motion of the radius with respect to the ulna, the stability of the DRUJ or the role of the reconstruction procedures was estimated. The initial static stability provided by the reconstruction was tested and compared with stability of the intact joint. nother 24 upper extremities were taken from fresh young adult cadavers and divided into three groups. The first group was used to valuate the effects of three increasingly larger TFCC excisions on force transmission to the ulnar The next group was used to compare the effect of Darrach procedure and Sauve?-Kapandji procedure on axial load...