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Biomedical subjects

F Bonnel

Publications and source records attributed to F Bonnel.

At least 19 recordsLinked to original sources
PubMed1992

Rotation-abduction analysis in 10 normal and 20 pathologic shoulders. Elite system application.

Kinematics of shoulder rotation-abduction in the plane of the scapula were analysed using the Elite system. We evaluated 10 asymptomatic subjects and 20 patients with painful conditions affecting the shoulder, 10 adhesive capsulitis and 10 rotator cuff-tears. The last pathologic cases were reexamined after rehabilitation treatment. The Elite system computed on line the trajectories of 8 retro reflective markers glued on the main reference points (3 on the spine, 3 on the scapula and 2 on the humerus). Angles and linear velocities were also evaluated. The lower humeral site displacement and gleno-humeral angle increase allowed differentiation of the normal shoulder rotation-abduction from the abnormal movement. Hence, rehabilitation progress could be followed up.

Adult↗
PubMed1989

Histologic structure of the palmar digital nerves of the hand and its application to nerve grafting.

The digital nerves from 20 adult hands were studied histologically. The number of fascicles increases from the proximal to the distal portion of the finger. The number of myelin fibers was nearly the same in the nerves of the thumb and the index, long, and ring fingers. The mean diameter of the fascicles was of the order of 210 micrometer. Because there were many variations in the number of fascicles in the same nerve of different subjects, there was no attempt made at classification.

Aged↗
PubMed1989

[A misdiagnosed disorder: syndrome of the musculocutaneous nerve of the foot].

The syndrome of the pedal dorsal cutaneous nerve (described by one of us in 1979) is caused by irritation of the nerve in its course at the dorsum pedis. This is a rather frequent syndrome, often overlooked. It is manifested by a distinct association of atypical pain at the dorsum pedis and in the foot. After a review of 10 cases and a literature survey, the authors describe the characteristic signs of this syndrome. There are many factors at the origin of this pathology: static deformities (pes cavus anterior, valgus calcaneus, hallux valgus), local trauma or repeated microtrauma (ill sitting shoe). The diagnosis is essentially clinical, based on a positive Tinel sign along the course of the nerve and on the result of a trial infiltration of the region. The treatment is initially conservative with correction of deformities, adaptation of shoes, and local infiltration with corticosteroids. The neurolysis (performed in 4 cases because of persistent pain), showed dystrophic fibrosis. Such histologic lesions are an argument for considering entrapment as a potential cause of the syndrome.

Adult↗
PubMed1988

Biomechanics of the ligaments of the human knee and of artificial ligaments.

The treatment of serious sprains and chronic laxity of the knee calls for a knowledge of the mechanical properties of the stabilizing structures. The mechanical characteristics indicate an elasticity rate of from 21 to 30% for the cruciate ligaments and average of 11% for the lateral ligaments. Preservation methods markedly influence mechanical properties. In the case of chronic laxity, natural ligaments can be replaced by artificial ones. This comparative biomechanical study of natural and artificial ligaments provides a classification to help the user in his choice.

Biomechanical Phenomena↗
PubMed1988

[Musculo-cutaneous nerve syndrome in the foot. Apropos of 10 cases].

In 10 cases, the authors describe the musculo-cutaneous nerve syndrome in the foot. It involves pain and paresthesias located on the dorsal aspect of the foot, occurring after local trauma or repeated microtraumas (ill fitted shoes), promoted by a static disorder (anterior hollow foot, calcaneal valgus). The diagnosis is essentially clinical, based on the presence of a Tinel sign on the dorsum of the foot and on the infiltration test. The treatment consists in the combination of local measures and steroid infiltration. Neurolysis is only indicated in case of failure of the medical treatment (4 cases). Then, it always proves to be effective.

Adult↗
PubMed1986

The three-dimensional active rotary stabilization of the knee.

The careful examination of insertions and directions of the tendons of the knee peri-articular muscles permits a global conception of the action of the 29 couples in rotatory stabilization. First, an analytic study of the tibial and femoral rotatory stabilization is considered. Second, the three-dimensional rotatory mechanical coupling between femur and tibia is developed. The anatomical complexity of the musculotendinous elements allows understanding of the risks of desynchronisation of the articular joint in case of lesion of the central ligament pivot.

Aged↗
PubMed1985

In vivo corrosion of sodium silicate glasses.

Square-shaped implants of various sodium silicate glasses were weighed and implanted intraperitoneally in rat for periods ranging from 8 to about 60 days. The implants were then removed and their aspect was compared to their aspect before exposure to physiological environment. The corrosion products were studied by x-ray diffraction and electron microprobe analysis. Weight changes were also measured to calculate a biodegradation rate. The glass 66 SO (66.6 SiO2-33.3 Na2O) was strongly corroded, as early as after the first week. The nonsoluble degradation products formed a cocoon encapsulating the now smaller specimen. The analysis of the cocoon showed that it was made of a silica-rich layer containing also calcium and phosphorus. In this layer the ratio Ca/P could correspond to that of an apatite. The biodegradation rate reached 71 x 10(-4) g . cm-2 . day-1. The glass 75 SO (75 SiO2-25 Na2O) was not so quickly corroded: Cracks appeared at the surface and progressively reached the center of the implants. There was no removable shell but a white deposit, adherent to the surface. This deposit contained silica and also calcium and phosphorus at the periphery. The biodegradation rate was only 2.6 x 10(-4) g . cm-2 . day-1.

Animals↗
PubMed1985

Anatomical study of the ulnar nerve in the hand.

This anatomical study is based on the dissection of fifty adult hands. The classic configuration of the ulnar nerve was found in thirty-nine cases out of fifty, and in eleven cases there were variations with respect to division. The levels of division of the different branches were precisely determined by an analysis of variations in the areas of muscular innervation.

Aged↗
PubMed1985

Histologic structure of the ulnar nerve in the hand.

Serial histologic sections of 20 ulnar nerves revealed broad individual variations in the number and diameter of the fascicles at all levels. The number of fascicles increased from the proximal portion to the distal portion, and interfascicular and perifascicular connective tissue occupied about 50% of the entire nerve section. These configurations explain the difficulties and setbacks encountered in the repair of injuries to the ulnar nerve. The counting of myelinated nerve fibers also revealed a great number of variations.

Adult↗
PubMed1985

Vascularization, cellular behavior, and union of vascularized bone grafts: experimental study in the rabbit.

The rabbit fibula was used as the experimental model in this study of the biological changes in nonvascularized and vascularized bone grafts (N = 72). Radiological study showed that the time required for union was about the same for both types of graft. Histological study with tetracycline as a marker showed that there were cellular changes in these two types of graft: moderate hematopoietic and osteocytic loss associated with an increase in bone porosity in vascularized grafts and virtually total osteocytic renewal and marrow necrosis in nonvascularized bone grafts. Quantitative study of vascularization by flow measurement using labeled microspheres showed a brief initial phase of hypervascularization in vascularized grafts, while revascularization took place early in nonvascularized grafts and was followed by hyperemia from the first to the third month. Calcium uptake curves for the two types of graft were quite closely superimposable upon blood flow rate curves. However, the comparative results presented in this study may be tempered by the fact that all grafts were applied to a recipient bed of excellent quality, consisting of well-vascularized muscles.

Animals↗
PubMed1985

New concepts on the arterial vascularization of skin and muscle.

From a personal anatomic study, the author describes here the principles of cutaneous and muscular arterial blood supply and proposes a new classification. The cutaneous arterial blood supply depends on musculocutaneous arteries and on direct cutaneous arteries. With the exception of some cutaneous flaps that are supplied by direct cutaneous arteries, most other cutaneous areas are supplied by musculocutaneous arteries. The dissection of a fasciocutaneous flap reveals a new possibility for repairing large skin defects. The subcutaneous aponeurosis possesses a rich vascular supply and an important arterial network. The muscular arterial blood supply is fully studied here with the description of two main groups of muscles corresponding to an adequate blood supply.

Aged↗
PubMed1985

[Osteosynthesis of the low lumbar spine and spondylolisthesis. Modification of the Scholner plate and pedicular screwing].

A modification of Roy Camille's Technic for better screw location into the pedicle of vertebra of the low lumbar column and lumbo-sacral junction is reported. A small 5 millimeters resection of the inferior articular process allows a more cranial drill-hole which is more steadily in the pedicle of the vertebra as confirmed by X rays controls and anatomic specimens. A 10 degree slope to a caudal direction is needed at the L5 level and a 30 degree slope to a caudal direction is required at S1 level. 50 millimeters length screw can be used for adult patients. Some modification of Scholner's plate are proposed in spondylolisthesis surgery.

Bone Plates↗