PubMed Health⌕ Search

SEARCH · PubMed Health

Results for “Ischium”

Explore indexed PubMed citations for clinical trials, systematic reviews and public health research. Read source abstracts and follow each citation to its original PubMed record.

Quote a phrase for an exact phrase match. Source license links do not imply unrestricted reuse.

At least 19 recordsLinked to original sources
PubMed1975

The ischium and hip extensor mechanism in human evolution.

Although it is commonly stated that the ischia of the late Pliocence-early Pleistocene hominid fossils are long and ape-like, new interpretations show this view to be falacious. An important new theory proposed by Robinson concludes that the gracile form of early hominid was an efficient biped, but the robust form was a less efficient biped and was adapted for tree climbing. Interpretation of the ischium is crucial to this idea. The present study shows that (1) the gracile and robust australopithecine ischia had similar relative lenths and (2) that the hamstring mechanism was probably very similar in the two forms of South African early hominid.

Acetabulum↗
PubMed1979

Giant cell tumor of the ischium: unusual site and outcome.

We have described an unusual case of giant cell tumor of the ischium. The remarkable features of the case are that it occurred in a relatively rare site and that it transformed radiologically from a localized, well circumscribed lesion into a very destructive lesion over a period of several months, though histologically it remained benign in appearance. The lesion was successfully treated by a modified hemipelvectomy. We emphasize that the treatment of choice in giant cell tumor of bone is total en bloc excision and not curettage or irradiation.

Bone Neoplasms↗
PubMed1979

Detachment of the ischial tuberosity sows.

The clinical and pathological features of five cases of detachment of the ischial tuberosity are described. In two cases, the detachment occurred unilaterally; one was a gilt showing severe lameness which precluded mating and the other was a uniparous sow which showed only slight lameness. Three gilts which were affected bilaterally developed progressive lameness during pregnancy and were unable to stand after farrowing. One of these gilts died and two had to be slaughtered. The diagnostic features of the epiphyseal detachment were shortening of the caudal extremity of the ischium, palpation of the displaced ischial tuberosity and crepitation elicited by pressing the displace tuberosity against the ischium.

Animals↗
PubMedDate not supplied

Reconstructive surgery in the myelomeningocele hip.

In 17 myelomeningocele patients with subluxating or dislocated hips, 31 posterolateral iliopsoas were treated by transfers, as described by Sharrard, in addition to complimentary procedures to balance muscle power and center the hip joint. Surgical goals are to stablize the hips within the acetabulum and prevent the occurrence of severe fixed flexion and adduction contractures of the hip and secondary lumbar lordosis. Surgery is performed at about 1 year of age with bilateral adductor transfer to the ischium, followed in 2 weeks by the posterolateral transfer of the iliopsoas muscle, first on one hip and 2 weeks later following with the other hip. Adductor transfer to the ischium reduces the adductor and secondary flexor power of the adductor longus and anterior fibers of the adductor brevis. After transfer it provides some extensor power. The range of abduction is increased. The transferred iliopsoas muscle has a better mechanical advantage in its new function as an abductor and extensor, and the hips were better centered radiographically than the cases with iliopsoas transfer alone. Fewer bony procedures were required to center the hips when the iliopsoas transfer was performed in children before the age of 1 1/2 years.

Braces↗
PubMed1978

Growth and development of the acetabulum in the normal child. Anatomical, histological, and roentgenographic studies.

Postmortem studies of ten normal full-term infants and of three children, seven, nine, and fourteen years old, showed that the acetabular cartilage complex is a unit that is triradiate medially and cup-shaped laterally and is interposed between the ilium, ischium, and pubis. This complex is composed of epiphyseal growth-plate cartilage adjacent to these bones, of articular cartilage adjacent to these bones, of articular cartilage around the acetabular cavity, and, for the most part, of hyaline carilage. Interstitial growth within the triradiate part of the cartilage complex causes the hip socket to expand during growth. The concavity of the acetabulum develops in response to the presence of the spherical femoral head. The depth of the acetabulum increased during development as the result of interstitial growth in the acetabular cartilage, of appositional growth at the periphery of this cartilage, and of periosteal new-bone formation at the acetabular margin. At puberty, three secondary centers of ossification appear in the hyaline cartilage surrounding the acetabular cavity. These centers are homologous with other epiphyses in the skeleton. The os acetabuli, which is the epiphysis of the os pubis, forms the anterior wall of the acetabulum. The epiphysis of the ilium, which has been called the acetabular epiphysis, forms a good part of the superior wall of the acetabulum. A small epiphysis of the ischium was seen in the oldest patient, who was fourteen years old. The bone in these epiphyses expands toward the periphery of the acetabulum and thus contributes to its increase in depth.

Acetabulum↗
PubMed1979

Using warning devices to improve pressure-relief training.

A training and monitoring system has been developed to train spinal cord injured patients to relieve pressure intermittently from ischium while sitting in wheelchairs. The system automates the training of wheelchair push-ups based on certain conditioning principles. The system reminds the patient to do a push-up of a specified duration and at specified intervals. The frequency and the duration of the push-ups are monitored providing information about performance of the patients, especially when the alarms to remind the patients are disconnected. A long-term study is in hand to assess the effectiveness of the system.

Adolescent↗
PubMed1978

Complications of total ischiectomy for the treatment of ischial pressure sores.

Five patients are reported, 4 of whom had total ischiectomies and the other an extensive partial ischiectomy. In each, recurrent ulcers, extending into the perineum, developed subsequently. One patient had a urethrocutaneous fistula as a result of his perineal ulcer, and he had to undergo an ileal loop diversion. Following a unilateral ischiectomy, the pressure is shifted to the opposite ischium, and this favors the development of another ischial pressure sore on the opposite side. After bilateral ischiectomy there is much more pressure on the perineum, and these patients may go on to develop a perineal pressure sore--particularly if there is a dislocated hip. Recurrent pressure sores which extend into the perineum are difficult to treat, and usually they appear to be related to a previous extensive removal of the ischia.

Adult↗
PubMed1978

[Cleido-cranial dysplasia--two observations].

The radiological changes of cleido-cranial dysplasia are described on the basis of two cases. Special attention is paid to the dental and facio-maxillary aspects. The main features are: (1) Supernumerary teeth, persistence of the first dentition, retention of the second dentition. (2) Open fontanelles and sutures and intercalary bones. (3) Hypo- or aplasia of the clavicles. (4) Defects in the vertebral neural arches and (5) dehiscence of the symphysis due to absent or delayed ossification of the pubis and ischium.

Adult↗
PubMed1975

Intrapelvic protrusion of the acetabular component following total hip replacement.

Protrusion of the acetabular component into the true pelvis following total hip replacement has occurred in 5 patients, 4 with severe rheumatoid arthritis and 1 with a destructive type of degenerative hip disease. Preoperatively all hips had severe protrusio acetabuli, a markedly thin acetabular medial wall and advanced osteoporosis. Four had a McKee-Farrar prosthesis, a metal-to-metal device with high frictional torque, particularly when the contact is equatorial, and no damping capacity against marginal impingement in the extreme range of motion. In order to reduce the incidence of intrapelvic protrusion, extreme care should be given to preserve the medial bone stock of the acetabulum, more so when it is already damaged or defective. If anchoring holes are used they should be restricted to the superior ilium, pubis and ischium and should not perforate the medial wall. Once loosening is present, reoperation is indicated to avoid progressive bone reabsorption by the abrasive motion of the loosened prosthesis, that might lead to irreparable bone loss. To reduce the stress transmitted to an already weakened acetabulum, select a total prosthetic device with low friction; fix it with acrylic cement in order to distribute the stress over a large surface; carefully orient both components to avoid marginal impingement; be certain to preserve the medial wall as much as possible and if it is already defective reinforce it by bone grafting and/or wire mesh.

Acetabulum↗
PubMed1979

Effect of chlorpromazine on skeletogenesis. The result of maternal administration of the drug in experimental rats.

Chlorpromazine hydrochloride (CPZ) is known to induce intrauterine and extrauterine growth retardation. A single dose of CPZ (100 mg/kg) was administered to pregnant CF rats on the 14th day of gestation (sperm positive=day 0). Fetuses were collected from the 16th to the 20th day of gestation and processed for alizarin red-S stain. Ossification was delayed by 1 to 3 days in the long bones of the extremities, by 1 day in the scapulae and by 2 to 3 days in the ilium. Ischium and pubis remained unossified until the 20th day of gestation. Ossification of the skull bones was also delayed as manifested by the presence of wide sutures in the treated cases. The number and range of ossified vertebral bodies and arches in the treated group were always less than those in the control group. The sternebrae were most affected. The ribs also showed a significant delay in maturity.

Animals↗
PubMed1975

Pressure sores: an operant conditioning approach to prevention.

A training system for the prevention of pressure sores has been designed to teach the paralytic person to relieve pressure intermittently from his ischium while sitting in a wheelchair. The system automates the training of wheelchair pushups, and conditions the person into exercising, based upon modified avoidance learning procedures. Results indicate that the paralytic person can be trained to pushup intermittently and efficiently using this system, thus reducing the incidence of pressure sore formation. Further long-term study is needed to assess the effectiveness of the training system as a preventative program for pressure sores.

Adult↗