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Biomedical subjects

A Boabighi

Publications and source records attributed to A Boabighi.

At least 19 recordsLinked to original sources
PubMed1993

The distal ligamentous complex of the scaphoid and the scapho-lunate ligament. An anatomic, histological and biomechanical study.

22 fresh cadaver specimens have been examined to study the anatomy, histology and biomechanical features of the ligaments of the proximal and distal poles of the scaphoid. The biomechanical study was carried out by two methods: an analytical one on an Instron machine, and a global one in situ. The different experiments show the predominant rôle of the distal ligamentous complex of the scaphoid over the scapho-lunate ligament. This contrasts with the generally accepted concept and modifies the management of lateral carpal instability.

Biomechanical Phenomena↗
PubMed1993

[Aponeuroses and superficial fascia. Mechanical and structural properties].

Eleven superficial aponeuroses have been examined in order to study their biomechanical and structural properties. Specimens were taken from 5 fresh cadavers, 3 males, 2 females with a mean age between 40 and 60 years. The study was done by two methods: biomechanical and histological. Aponeuroses can be classified in 2 biomechanical and histological groups that match perfectly. The first group has biomechanical and histological properties similar to those of tendons, and the second group similar to those of tendons, and the second group similar to those of ligaments. Ignoring the biomechanical and histological properties of tendons, ligaments and aponeuroses can be the cause of failure of a number of ligament and tendon plasties. The surgeon has an important role in choosing the transplants according to the histological properties (thickness, length of structures, bundle orientation) and biomechanical properties (solidity and extensibility).

Adult↗
PubMed1992

[Extension of the fingers. III. Morphologic and structural study].

The volar fascicles of the interosseous muscles possess two separate components: the proximal and glenoidal one, the distal and aponeurotic other. The armature of the dorsal aponeurosis is constituted the deep, the central and the collateral expansions of the extensor digitorum muscles, and the interosseous muscles, whom are added the lumbrical muscles. The deep expansions are constant and are fixed respectively at the basis of the first phalanx. The central and the collateral expansions constitute equally the central and the collateral, then terminal tendons, which are respectively fixed at the basis of the second and at the third phalanx. The unitive structures: dossiere, triangular and retinacular ligaments are intricate with this of the armature and render jointly the whole. All the concerned fascicles have the mechanical and histological characteristics of the tendon.

Biomechanical Phenomena↗
PubMed1992

[Experimental carpal displacement induced by ligamental lesions].

Ligamentous lesions were created experimentally in 40 fresh cadaver wrists. The precise localization of traumatic rupture of the ligaments and the subsequent carpal imbalance were defined by the comparison between the experimental results and the clinical displacements. The displacements may be permanent, sequential or induced by external forces. Lesions of capsular ligaments cause the displacement. There are 3 functional units; the distal scaphoid complex; the palmar ligaments which form a "belt", consisting of the lateral external ligament, the radiocarpal ligaments an the radiate ligament; the medial ligaments, which also form a "belt" consisting of the palmar triquetral ligaments on each side of the triquetrum. The sprains are caused by a lesion of a functional unit. The lateral sprain is characterized by a lesion of the distal scaphoid complex. The scaphoid moves into a horizontal position, causing a dorsal deviation of the lunate and a scapholunate diastasis. The central sprain is induced by a rupture of the palmar "belt", causing an anteroposterior radiocarpal or mediocarpal drawer movement. The medial sprain is induced by the rupture, of different extents, of the medial ligaments. On examination, there is either a click or a palmar deviation of the lunate, sometimes with a lunotriquetral diastasis. The dislocations of the wrist are caused by lesion of several ligamentous units.

Biomechanical Phenomena↗
PubMed1992

[Finger extension. II. Materials and methods].

The study of the extensor apparatus through different methods concerns 200 fingers, the most of fresh cadavers. The dissection through direct observation or with surgical microscope of the dorsal aponeurosis of 30 fingers has been completed by an histological study of 10 fingers. The mechanic properties of each dorsal aponeurotic structure has been tested by extensometry on 12 fingers. The functional study of the role and of the transmission of the different motor components concerns 128 fingers. It has been completed by experimental sections of each aponeurotic structure concerning 20 fingers.

Finger Injuries↗
PubMed1992

[Salvage ligament repair following failure of arthrodesis of the lunate-triquetrum-hamate joint for internal instability of the joint. Apropos of a case report].

A case of posttraumatic carpal dislocation in volar inclination of the intermediary segment (VISI), treated by a lunate-triquetrum-hamate arthrodesis (LTH) is presented. This operation leaves the rupture of the radio-triquetrum dorsal ligament; rather the entire carpus rotates in supination postoperatively. This repair of the radio-triquetrum dorsal ligament permits realignment and stabilization of the carpus and results in resolution of pain.

Arthrodesis↗
PubMed1992

[Experimental carpal displacement induced by bony lesions].

Bony lesions were created experimentally in 48 fresh cadaver wrists. They consisted of radial and scaphoid resections along the extent of the proximal carpal row, representative of clinically-induced (usually traumatic) lesions. The displacements obtained experimentally to mirror each clinical situation modify the physiologic equilibrium established between the trans-osseous forces and the ligaments. The comparison between the experimentally-induced lesions and clinical displacements shows the etiology of the clinical conditions which indicates the proper treatment.

Carpal Bones↗
PubMed1990

Properties of the fibrous structures of the wrist.

Every fibrous structure of ten wrists of fresh cadavers has been the object of an elastometric study. The opposite wrists have been studied surgically and then histologically with the optical microscope. Comparison between the two shows a close relationship between the mechanical features and the morphology of the bundles, which proved also to be perfectly measurable. It also displays the great differences between ligaments and tendons. Histological study of the tendons and ligaments of four other wrists subjected to manoeuvres of axial loading, rupture and bending, reinforces these statements. The therapeutic consequences are considered.

Biomechanical Phenomena↗
PubMed1989

[Elastometric study of the distal scaphoid ligamental complex and the scapho-lunar ligament].

Six wrists from fresh cadavers have formed the subject of a functional, histological and biomechanical study. This one has been realized by two methods: the one analytical, the other in the whole and in situ. The diverse experiences show up the pre-eminent role of the distal scaphoid ligamentous complex relative to the scapholunar ligament. This fact is in opposition to the generally admitted theories. It modifies the therapeutic approach to lateral carpal instabilities.

Biomechanical Phenomena↗
PubMed1988

Vascularisation of the carpus, a systematic study.

The authors have injected the arteries and dissected 79 wrists. They propose a systematization of the vascular supply of the carpus, based on the major longitudinal and transverses axes; on the areas of arterial convergence and divergence, at the origin of 2 systems: the deep system (SAPRUC) is a vestige of the foetal morphology; it is periostal and sub-capsular. The superficial system (SASRUC) is predominant; it is constituted by the proximal and distal extracapsular pedicles.

Carpal Bones↗
PubMed1988

Boutonniere deformity in Dupuytren's disease.

The boutonnière deformity in Dupuytren's disease has been found to be due to fibrous contraction of the transverse retinacular ligament which anteriorly displaces the fibres of the extensor apparatus. Complete ablation of this ligament and liberation of the extensor apparatus allows easy extension of the finger when operating on severe cases of Dupuytren's contracture.

Dupuytren Contracture↗
PubMed1988

[Chronic internal metacarpophalangeal sprains of the thumb. Anatomo-clinical classification and therapeutic consequences].

In the light of a physiopathological study of severe medial strain of the metacarpophalangeal joint of the thumb in 20 cadaver hands, the authors propose a correlation between anatomical and clinical findings and a classification derived from it: Stage I: rupture of one fascicle of the collateral ligament. Passive valgus mobility of less than 15 degrees. The ruptured ends of the ligament remain in contact. Stage II: rupture of both fascicles of the ligament. Passive valgus and supination mobility of the metacarpophalangeal joint of 20 to 40 degrees. Interposition of the dorsal digital expansion between the ruptured ends of the ligament. Abnormal movements can be corrected by applying tension to the dorsal digital expansion. Stage III: rupture of both fascicles of the collateral ligament and the dorsal digital expansion. Tension from the thenar muscles causes abnormal movement and produces a fixed flexion of the metacarpophalangeal joint with hyperextension of the interphalangeal joint (Z-shaped thumb). From this the authors determine the operative indications and suggest a palliative ligamentoplasty to restore the anatomy as much as possible.

Chronic Disease↗
PubMed1988

[The radio-lunate sagittal index].

Colles' fractures with important displacement are accompanied by a subdislocation of the carpus backwards. The authors describe a radio-lunate sagittal index that measures the posterior displacement. This index should be instored during the reduction of the fracture.

Colles' Fracture↗
PubMed1987

Vascularized bone graft pedicled on the volar carpal artery for non-union of the scaphoid.

A bone graft, taken from the medial part of the radial epiphysis can be pedicled on the radial branch of the volar carpal arch, freed back to its origin. The graft can be transferred into the proximal row of the carpus to fill up a loss of bony substance or to provide vascularised bone. This permits the treatment of chronic pseud-arthrosis of the scaphoid where a Matti-Russe operation has failed. In the first three cases operated upon, favourable results have been obtained.

Adult↗
PubMed1987

[Experimental study on a plaster cast in fractures of the carpal scaphoid. Clinical deductions].

The displacement of the proximal and distal fragments of fractures of the carpal scaphoid have been studied in fresh cadavers. In 10 subjects, a comparison has been made between a below-elbow plaster, a moulded plaster gauntlet and an above-elbow plaster. The most satisfactory immobilisation has been obtained with a moulded plaster gauntlet incorporating the proximal phalanx of the thumb and leaving the elbow free.

Cadaver↗