Surgical Importance of Radiographically Aided Morphometry of the Proximal Ulna

Abstract

Huseyin ErdemERDEM, H. Surgical importance of radiographically aided morphometry of the proximal ulna. Int. J. Morphol., 38(2):299-304, 2020. SUMMARY:This study was conducted to define the proximal ulnar morphometry with respect to dorsal and intramedullary implant design. Eighty two dry Anatolian ulnae were evaluated by both the traditional and digital morphometric analysis methods. Also the medullary cavities and cortical bone thicknesses were measured from radiographic images. The mean value of ulnar length (UL) was 25.06 cm; distance between the most prominent anterior point of the superior surface of the olecranon (MAPO) and the most posterior point of the olecranon (MPPO), distance between the MPPO and maximum anterior angulation (MAA), distance between the MPPO and the maximum varus angulation (MVA) were; 1.67 cm, 5.36 cm and 7.56 cm, respectively. The average antero-posterior diameters at midolecranon plane (MOP), MAA plane (MAAP) and MVA plane (MVAP) were; 1.78 cm, 1.68 cm and 1.41 cm; transverse diameters of same planes were; 1.96 cm, 1.65 cm and 1.51 cm, respectively. The mean olecranon angle (OA), MAA and MVA were: 113.35°, 9.12°a nd 13.82°; also the mean circumferences at same planes were 6.48 cm, 6.37 cm and 5.16 cm, respectively. The mean antero-posterior medullary diameter at MAAP and mean transverse medullary diameter at MVAP were; 6.83 mm and 7.22 mm, respectively. Mean anterior and posterior cortical bone thicknesses at MAAP were: 3.61 mm and 4.25 mm; the mean medial and lateral cortical bone thicknesses at MVAP were: 4.06 mm and 4.13 mm, respectively. Dorsal angulation and medullary angulation of the proximal ulna presents different architecture. Unique morphological architecture of the proximal ulna should be taken into consideration in means of surgical operations and examination of radiographic images. It can be inferred that standardized bony landmarks may helpful during the process of designing and manufacturing precurved dorsal plates and as well as variable proximal ulnar implants. ERDEM, H. Surgical ımportance of radiographically aided morphometry of the proximal ulna. Int. J. Morphol., 38(2):299-304, 2020.

Comparative Analysis of Clinical Effects of the Cable‐Pin System and Kirschner Wire Tension Band (TBW) Internal Fixation in the Treatment of the Olecranon Fracture

“…In severe cases, it also has a certain impact on the functional exercise of the patients' elbows. The cable-pin system has the following advantages in the treatment of olecranon fracture [ 26 ]: (1) the binding device equipped with the cable-pin system can prevent the slippage and failure of the cable-pin system, which is beneficial to healing of the ulnar olecranon fracture with less subcutaneous irritation symptoms and fewer complications, such as wire loosening, fracture, and pintail slippage, and reduce the probability of secondary revision surgery. (2) The screw tail of the cable-pin system can be embedded in the bone cortex, which minimizes the pressure on the skin and soft tissue behind the olecranon of the elbow joint, and (3) the screw is connected with the titanium cable in the cable-pin system, which eliminates the need for reserved bending of the tail of the Kirschner needle during operation, and the operation is simple and firm.…”

Simulated Analysis Ti-6Al-4V Plate and Screw as Transverse Diaphyseal Fracture Implant for Ulna Bone

“…Based on the International Organization for Standardization (ISO) 5835:1991 about the ideal screw design is utilizing a 3.5 mm thread diameter with a core diameter of 2.4 mm, a screw head diameter of 6 mm, and a pitch width of 1.25 mm. Another one explains that the anteroposterior diameter of the ulna bone is in the range of 8.5-18.7 mm, with an average of 14.1 mm [15]. By this literature, the screw was designed with a length of 14.8 mm, which measured from the screw neck to the tip, so the overall size of the screw from head to the tip is 18.6 mm.…”