Pronation Contracture of the Forearm Due to Iatrogenic Scar Formation of the Distal Membranous Part of the Forearm Interosseous Membrane

2006 ◽  
Vol 31 (4) ◽  
pp. 397-400 ◽  
Author(s):  
S. OKAMOTO ◽  
T. NAKAMURA ◽  
E. YAMABE ◽  
S. TAKAYAMA ◽  
Y. TOYAMA

A case of successful treatment of pronation contracture of the forearm due to iatrogenic scar formation in the distal membranous part of the interosseous membrane of the forearm is presented and the management of this problem is discussed.

1999 ◽  
Vol 24 (2) ◽  
pp. 245-248 ◽  
Author(s):  
T. NAKAMURA ◽  
Y. YABE ◽  
Y. HORIUCHI

In vivo dynamic changes in the interosseous membrane (IOM) during forearm rotation were studied using magnetic resonance imaging (MRI). The right forearms of 20 healthy volunteers were examined in five different rotational positions. Axial slices were obtained at the proximal quarter, the middle and the distal quarter of the forearm. The changes in shape of the IOM during rotation were observed in an axial MR plane. For each image, we measured the interosseous distance and the length of the interosseous membrane. Images of the tendinous and membranous parts of the IOM could be differentiated by thickness. There were minimal dynamic changes in the tendinous part on the MRI while the membranous part showed numerous changes during rotation. The interosseous distance and the length of the interosseous membrane were maximum from a neutral to a slightly supinated position. The tendinous part is considered to be taut during rotation to provide stability between the radius and the ulna, but the membranous part which is soft, thin and elastic, allows smooth rotation.


2021 ◽  
Vol 29 (1) ◽  
pp. 117-124
Author(s):  
Mikheev V. Mikheev ◽  
Sergey N. Trushin

Tracheobronchial injuries as a consequence of chest blunt trauma are rare. Blunt traumas of the cervical part of the trachea are a rarer pathology presenting a serious diagnostic problem for a clinician. Traumas of the larynx and the trachea account for 40 to 80% of lethality. The tracheas cervical part is vulnerable despite that it is covered with the neck muscles, spine, clavicles, and mandible. In cut/stab wounds, the tracheas cervical part is often damaged together with the adjacent structures. In blunt trauma, under a direct action of a traumatizing agent, the mobile trachea displaces toward the spine, accompanied by damage to the tracheal cartilages, its membranous part, and the soft surrounding tissues with preservation of the integrity of the skin. Tracheal ruptures along the distance up to 1 cm from the cricoid cartilage account for not more than 4% of all tracheal ruptures. A complete tracheal rupture and its abruption from the larynx are extremely rare pathology. Because of severe respiratory disorders, most victims die at the site where their injury occurred. This article presents a clinical case of the successful treatment of patient Z., 41 years of age, with complete tracheal abruption from the larynx. The cause of tracheal damage was blunt neck trauma in a traffic accident. A peculiarity of this clinical case was that the victim arrived at a specialized thoracic surgery unit with a functioning tracheostomy two days after the trauma. Conclusion. Tracheal trauma is a potentially fatal condition. Therefore, early diagnosis of tracheobronchial damage is essential since it permits timely surgical intervention and diminished risk of lethal outcome. When dealing with patients with trauma of the head, neck, and chest with non-corresponding clinical data and the absence of effective recommended standard therapeutic measures, a clinician should become alert and exclude the tracheal and bronchial damage. X-ray computed tomography and fibrotracheobronchoscopy are strongly recommended as reliable methods to diagnose tracheobronchial damages. In a surgical intervention, it is necessary to perform the primary suture on the trachea, avoid preventive tracheostomy, and delay interventions associated with poorer prognosis and a high complication rate.


Hand Surgery ◽  
1999 ◽  
Vol 04 (01) ◽  
pp. 67-73 ◽  
Author(s):  
Toshiyasu Nakamura ◽  
Yutaka Yabe ◽  
Yukio Horiuchi

The functional anatomy of the interosseous membrane (IOM) of the forearm was studied in 15 fresh frozen cadavers. The IOM consisted of three components: the tendinous part; the membranous part; and the dorsal oblique accessory cord. The tendinous part was a thick and strong complex of three to ten bundles which run from the proximal one third of the radius to the distal quarter of the ulna. The membranous part was recognised as a soft and thin structure, adjacent proximal and distal to the tendinous part. The dorsal oblique cord was found as a single cord on the dorsal side of the IOM from the proximal quarter of the ulna to the middle region of the radius. This cord was distinct from the oblique cord, which existed on the palmar side of the forearm separated from the IOM. The IOM was flat in the neutral position, while it flexed along the rotation axis in pronation and supination. Since the prominence of the curvature in the IOM was almost in the same direction as the fibres of the tendinous part, the tendinous part demonstrated only bending, similar to partial bending of an elastic board. The bending position was changed with the forearm position and the tightened bundles in the tendinous part were altered during rotation.


Author(s):  
G. G. Maul

The chromatin of eukaryotic cells is separated from the cytoplasm by a double membrane. One obvious structural specialization of the nuclear membrane is the presence of pores which have been implicated to facilitate the selective nucleocytoplasmic exchange of a variety of large molecules. Thus, the function of nuclear pores has mainly been regarded to be a passive one. Non-membranous diaphragms, radiating fibers, central rings, and other pore-associated structures were thought to play a role in the selective filter function of the nuclear pore complex. Evidence will be presented that suggests that the nuclear pore is a dynamic structure which is non-randomly distributed and can be formed during interphase, and that a close relationship exists between chromatin and the membranous part of the nuclear pore complex.Octagonality of the nuclear pore complex has been confirmed by a variety of techniques. Using the freeze-etching technique, it was possible to show that the membranous part of the pore complex has an eight-sided outline in human melanoma cells in vitro. Fibers which traverse the pore proper at its corners are continuous and indistinguishable from chromatin at the nucleoplasmic side, as seen in conventionally fixed and sectioned material. Chromatin can be seen in octagonal outline if serial sections are analyzed which are parallel but do not include nuclear membranes (Fig. 1). It is concluded that the shape of the pore rim is due to fibrous material traversing the pore, and may not have any functional significance. In many pores one can recognize a central ring with eight fibers radiating to the corners of the pore rim. Such a structural arrangement is also found to connect eight ribosomes at the nuclear membrane.


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