ABSTRACT
Background : There are many conditions of phalangeal fractures require digital external fixators both commercial and disposable. The biomechanical comparative studies of these fixators have not been reported especially for disposable digital external fixators(DDEFs). The new design, adjustable length digital external fixator (ALDiEs) was innovated Purpose : To compare the biomechanical properties of various DDEFs.Materials and Methods : Synbone ; Swiss made, Model 4060 900285 were used to be the phalangeal model for the biomechanical testing. Three types of DDEs and their applications were tested. Ten samples of each type were fixed into phalangeal models. Biomechanical analyses were performed by material testing machine, Loyed Instrument interfaced with Windap data analysis software. The structural stiffness (SS), Yield stress (YS) and ultimate stress (US) both in compression and distraction forces were recorded. Statistical analysis was performed using ANOVA and a post hoc LSD .Study design : Experimental studySetting : Orthopedics department, Faculty of Medicine, Khon Kaen UniversityResults : The SS of one frame Poorman DDEFs, Godwin DDEFs and ALDiEs were 14.54, 14.83 and 12.43 N/mm. in orderly. The Godwin DDEFs had the highest SS (P
ABSTRACT
Background : Tendon grafting is the procedure, which often performed in the hand reconstruction. There are many tendons have been used in this procedure for instance palmaris longus, plantaris and toe extensor tendons. Unfortunately, there are many variations in the presence or absence of these tendons. Moreover, the length and diameter of these tendons are also varied from many reports. To determine the length of the tendon, therefore, the length of its corresponding bone could be used.Purpose : To identify the variations of presentation of palmaris longus and plantaris tendons in the cadavers, and to determine the relationship between these two tendons with the length of ulnar and tibial bones.Materials and Methods : Thirty cadavers from the Department of Anatomy were dissected. Palmaris longus and plantaris tendons were identified and measured their lengths and diameters. The length of ulna and tibia were also measured. The data were recorded and analyzed by using Microsoft Excel version program.Study design : descriptive studySetting : Department of Anatomy, Faculty of Medicine, KhonKaen UniversityResults : Eighty percent of the cases had palmaris longus in one side. Ninety – three percent of the cases had plantaris tendons and 6.6 % had plantaris tendon in only one side. Of those cases with absent palmaris longus tendon, the plantaris tendon stills present. The mean lengths of palmaris longus were 14.59+ 2.08 cm. and 14.24 + 2.53 cm. on the left and right sides respectively. The mean lengths of plantaris tendon were 33.46 + 3.09 and 31.41 + 3.01 on the left and right sides respectively. There was only one case in whom the plantaris tendon width was smaller than 2 nn.. There was no correlation between the lengths of the tendons and the corresponding bones.Conclusions : The palmaris longus tendons seem to be more absent than the plantaris tendon. The length of the ulna could not be del\termined the length of the palmaris longus tendon and also the length of the tibia could not be determined the length of the plantaris tendons.