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Biomedical subjects

J T Bennett

Publications and source records attributed to J T Bennett.

At least 19 recordsLinked to original sources
PubMed2001

Stress fracture of the talus following resection of a talocalcaneal coalition: a case report.

We report the case of a 15-year-old male with bilateral talocalcaneal coalition. Following resection of the symptomatic coalition, the patient developed a painful ankle. MR imaging revealed a stress fracture of the talar body. In this report we discuss presentation and treatment of a symptomatic talocalcaneal coalition complicated by a later stress fracture as well as a review of the literature.

Adolescent↗
PubMed1999

Spontaneous ankylosis of the contralateral hip after unilateral adductor tenotomy in cerebral palsy.

This is the case report of a 15-year-old black male with spastic quadriplegia cerebral palsy who developed heterotopic ossification and spontaneous ankylosis of his contralateral nonoperative hip after unilateral adductor tenotomy. To the authors' knowledge, this is the only reported case of such an occurrence. The mechanism and possible risk factors are discussed as well as management of this complication.

Adolescent↗
PubMed1997

Blood flow to the immature hip. Ultrasonic measurements in pigs.

We quantitatively analyzed blood flow through the major arteries supplying the pig's femoral head during various hip positions and following ligation of various vessels in order to identify the vascular abnormalities which may be responsible for the development of avascular necrosis during the treatment of developmental dysplasia of the hip. Our findings reveal that a decrease in total blood flow to the femoral head occurs when the hip is held in the frog leg position with ligation of the deep femoral artery and proximal ligation of the lateral femoral circumflex artery, and ligation of the deep femoral artery, together with the lateral femoral circumflex artery proximally. In contrast, neither distal ligation of the medial femoral circumflex artery nor lateral femoral circumflex artery alone nor holding the hip in the Lange position caused a statistically significant decrease in total flow. We also observed a unique steal effect on total proximal femoral blood flow, with the hip held in the frog leg position. In 4 of 7 pigs, we found a reversal of flow in the medial femoral circumflex artery.

Animals↗
PubMed1995

Chondroblastoma of the patella presenting as knee pain in an adolescent.

We report a case of chondroblastoma of the patella, associated with an aneurysmal bone cyst and pathologic fracture, that presented as knee pain in a 13-year-old girl. This case is the fifth case in the literature that associates patellar chondroblastoma with fracture, which should probably be regarded as a significant feature of this lesion.

Adolescent↗
PubMed1993

Roentgenographic procedure for selecting proximal femur allograft for use in revision arthroplasty.

A roentgenographic scoring system was developed to help orthopaedic surgeons and bone banks estimate the quality of bone stock in proximal femoral allografts intended to use in revision arthroplasty. This system scores a standardized anteroposterior roentgenograph of the proximal femur using four indices representing morphological features of cancellous and cortical bone known to be clinically associated with bone strength. The indices were combined to give a weighted score, which was thought to reflect the ability of a bone to carry in vivo loads. Thirty bones were evaluated for bone mineral density using dual-photon absorptiometry. They were then sent to another institution and evaluated using the newly devised roentgenographic scoring system. The results showed that the bone score roentgenographic method is a reasonable technique for selecting allograft femurs for transplantation. This roentgenographic technique and scoring system has now been packaged into kits and is available to orthopaedic surgeons and bone banks for evaluating bone stock quality in proximal femoral allografts intended for transplantation.

Absorptiometry, Photon↗
PubMed1993

The use of Texas Scottish-Rite instrumentation in idiopathic scoliosis. A preliminary report.

The Texas Scottish-Rite instrumentation (TSRH) is a new system for the correction of spinal deformities that uses smooth rods and hooks stabilized to the rod with a three-point interference fit. This obviates the need for the break-off hex bolts and should make for easier removal and/or revision. Twenty-three patients with TSRH instrumentation were followed for an average of 18 months after surgery. The major scoliotic curve was corrected an average of 49% with the compensatory curve averaging 37% correction. Loss of thoracic kyphosis was less than 9 degrees although it increased on average 8 degrees in those patients where kyphosis was improved. There were no acute complications, but late complications included four cases of hook pull-out. Results are comparable to those found with the CD instrumentation. The TSRH instrumentation is an attractive alternative in scoliosis surgery, particularly because of the relative ease in which revision surgery may be performed.

Adolescent↗
PubMed1992

Neurologic testing with somatosensory evoked potentials in idiopathic scoliosis.

A study was undertaken to determine if a somatosensory conduction delay is present in the posterior columns of adolescents with idiopathic scoliosis. Somatosensory evoked potentials were recorded after median and posterior tibial nerve stimulation in 12 adolescent subjects being followed for idiopathic scoliosis with an average age of 14.6 years (range, 12.0-16.6 years). Twelve normal controls matched for age, sex, race, and height underwent identical testing. Evoked potential peak latencies were measured and conduction velocities calculated. Results showed no difference between scoliotics and normal controls. Comparable posterior column conduction velocities were recorded in both groups. If a defect in posterior column function does exist in adolescent idiopathic scoliosis, as previously postulated, it is not reflected by a conduction delay as measured by somatosensory evoked potential testing.

Adolescent↗
PubMed1992

Reduction of a nonconcentrically relocated hip dislocation in a seven-year-old boy.

Traumatic dislocation of the hip in childhood is a rare injury. Treatment usually consists of a closed reduction and some form of immobilization. Inability to obtain a concentric reduction by closed means is commonly attributable to soft-tissue interposition. This is a report of a method not previously described for obtaining reduction of a nonconcentrically reduced traumatic hip dislocation without an open surgical procedure.

Arthrography↗
PubMed1991

Chiari's osteotomy in the treatment of Perthes' disease.

Seventeen patients, with an average age of nine years 11 months, underwent 18 Chiari osteotomies for the treatment of painful subluxation of the hips following Perthes' disease. The average follow-up period was four years three months. The 13 patients reviewed clinically all did well and none complained of pain or instability. The radiographs were examined in all 17 cases. The average centre-edge angle and percentage femoral head cover were definitely improved by the operation. No significant medical displacement of the femoral head was achieved. The clinical success may result from improved femoral head coverage and diminished eccentricity. Chiari's osteotomy is recommended for adolescent patients with painful subluxation of the hip as a consequence of Perthes' disease.

Adolescent↗
PubMed1991

Survey of health care available to child athletes.

Surveys were sent to 84 children's hospitals and 397 sportsmedicine clinics to characterize the care available for the child athlete (aged 4 to 12 years); they were completed by 209 facilities (43% response rate). Fourteen of the facilities had a sportsmedicine clinic specifically for children; care was available for the child athlete in an additional 46 facilities, but less than 10% of the clinic visits were made by athletes aged 4 to 12 years. All responding clinics were further characterized by location, length of operation, composition, referral base, profitability and funding, etc. Although there are few sportsmedicine clinics specifically for children, many facilities provide experienced personnel in existing clinics to care for young athletes.

Athletic Injuries↗
PubMed1989

Congenital dislocation of the hip. Recent advances and current problems.

This article reviews changes that have occurred in the understanding and treatment of congenital dislocation of the hip (CDH). It is now recognized that CDH is a spectrum of diseases with differing etiologies, pathologies, and natural histories that, as a result, require different treatment approaches. The etiology of CDH involves genetic, hormonal, mechanical, and environmental influences. This recognition of mechanical factors that predispose to CDH has allowed the identification of high-risk patients. Screening for CDH in the new born has resulted in many more patients being diagnosed earlier. Ultrasonography has added a new dimension to CDH diagnosis, since it has demonstrated abnormal hips in otherwise normal children. In the newborn, the use of ultrasonography may be the single most important recent contribution to the study of this disease. The natural history of CDH is well-known: The disease often can lead to early coxarthrosis. However, avascular necrosis is a complication of treatment and results in a hip that may be worse than one not treated at all. Treatment of CDH includes gentle closed reduction in the majority of patients. In patients under six months of age, this can usually be achieved with the Pavlik harness. Up to the age of three years, gentle manipulative closed reduction after traction is successful in the majority of patients. The trend toward the use of home traction and away from inpatient skeletal traction has been documented by many centers to be successful. Open reduction is becoming infrequently required and has specific indications.(ABSTRACT TRUNCATED AT 250 WORDS)

Hip Dislocation, Congenital↗
PubMed1988

Lower cervical spondylosis and myelopathy in adults with Down's syndrome.

Abnormalities in the upper cervical spine resulting in cervical myelopathy in patients with Down's syndrome have been well-documented. However, two adult Down's syndrome patients recently presented with cervical myelopathy secondary to abnormalities of the lower cervical spine. Because of this, 105 Down's syndrome patients with normal upper cervical spines were evaluated clinically and radiographically. They were found to have an increased prevalence of lower cervical spondylosis that significantly correlated with physical findings consistent with cervical myelopathy. Therefore, physicians dealing with Down's patients should closely monitor neurological function and obtain flexion/extension laterals of the cervical spine to evaluate C1-C2 instability and degenerative changes in the lower cervical spine if a change in neurologic status is noted.

Adult↗
PubMed1983

Intramedullary migration of a bone plate and screws. A case report.

Intramedullary migration of an internal fixation device was noted in a 61-year-old woman, 56 years after treatment of a fractured femur. Gross, histologic, and metallurgic findings served to explain the disintegration of the metal plate and screws. The "migration" of the plate and screws is a manifestation of normal bone growth and demonstrates the remarkable potential for internal remodeling of bone.

Biodegradation, Environmental↗
PubMed1979

Paperwork and bureaucracy.

This study explores paperwork as an inherent characteristic of bureaucratic behavior. The magnitude and scope of the federal government paperwork burden on the private sector is given particular emphasis. A theoretical model of bureaucratic behavior is developed which shows that bureaucrats employ paperwork to shift the cost of agency functions to the private sector in order to increase their perquisites of office. The model indicates that, if the private sector were compensated for the federal paperwork burden, agency employment would be smaller, as would agency output and the volume of private-sector labor expended in preparing federal forms.

Costs and Cost Analysis↗