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Biomedical subjects

J Dove

Publications and source records attributed to J Dove.

At least 37 records · Page 2Linked to original sources
PubMed1991

A pedicle screw bridging device for posterior segmental fixation of the spine: preliminary mechanical testing results.

Mechanical assessment of a new pedicle screw bridge device for spinal surgery is reported. Results are given for a series of single tests to failure and a fatigue cyclical loading test. Comparative testing of torsional and lateral bending resistance on three surgical spinal fixation systems was carried out: Luque, wired Hartshill rectangle and pedicle screwed bridge with Hartshill rectangle and pedicle screwed bridge with Hartshill rectangle. The results show the superiority of the bridged Hartshill in both rotational and lateral bending resistance. The new bridge device could also improve the versatility of the Hartshill system to cover a wider spectrum of spinal fixations. A test to determine the axial pull-out strength of three screw designs was undertaken. The differences between the forces needed were insignificant. At failure a cylinder of bone tissues greater than the major diameter of the screw was pulled out without breaking the bone.

Biomechanical Phenomena↗
PubMed1991

Low back pain surgery, the use of the Hartshill system.

The Hartshill system is a modification of the Luque system of segmental spinal instrumentation. The philosophy of its use in low back pain is firstly the careful selection of patients. The method of selection will be discussed and attention will be drawn to one specific indication for low back surgery; namely, osteoarthritis of the lumbar facet joints. In any one patient the surgeon must be confident that the patient's pain is bad enough for surgery and that he has identified a definite pain source. The surgery should be designed to remove the pain source. If in the process of removing the pain source the spine is rendered unstable, then it is recommended that a fusion with internal fixation be performed. An independent review of our first 75 cases for osteoarthritis of the lumbar facet joints will be described. More recently we have recognized that in the lumbar spine it can be advantageous, particularly when there has been a wide laminectomy in the past, to gain fixation via the pedicle. The development and early clinical experience of a pedicle screw clamp to complement the Hartshill system will be described.

Back Pain↗
PubMed1991

The use of the Hartshill system for the cervical spine.

The Hartshill system is a modification of the Luque system for posterior segmental wiring of the spine and has for five years been our routine means of posterior spinal fixation throughout the spine from skull to sacrum and for all varieties of spinal disorders. This paper presents our experience with the use of the Hartshill system in the cervical spine. There have been 34 cases with a minimum two year follow-up (trauma 11, rheumatoid 8, facet osteoarthritis 7, tumor 5, congenital 2 and myelopathy 1). There has been only one serious complication. The system is essentially simple and inexpensive but, nonetheless, attention to detail in technique is important and this will be emphasized. Recent modifications of the Hartshill system for the cervical spine by Ransford and Fidler will be discussed. With proper attention to detail the Hartshill system provides a secure adaptable posterior fixation system that can be used throughout the cervical spine.

Bone Wires↗
PubMed1991

The use of the Hartshill system for the internal fixation of spinal fractures and tumors.

We present the use of our Hartshill system for the posterior fixation of fractures and tumors. We present our first 69 fractures with a minimum two year follow-up (11 cervical, 8 thoracic, 42 thoracolumbar, 8 lumbar). The Hartshill system is a simple and secure method for the fixation of the spine in such cases. Both in thoracolumbar fractures and in tumours the common problem is collapse of the anterior column so that the spine is in kyphosis. Biomechanically the solution for the reduction and internal fixation in such cases is to use a fixation system which reduces the kyphosis by creating a lordosis. This is simply achieved with the Hartshill system.

Biomechanical Phenomena↗
PubMed1989

Internal fixation of unstable spinal fractures: the Hartshill system.

The first 69 cases with a minimum of 1 year follow-up using the Hartshill system for the internal fixation of unstable spinal fractures (cervical 11, thoracic 8, thoracolumbar 42 and lumbar 8 are reported. The instrumentation is uncomplicated but attention to detail in technique is important. The system allows secure stabilization of the spine and early mobilization, irrespective of any neurological damage incurred in the primary injury.

Fracture Fixation, Internal↗
PubMed1989

Segmental wiring for spinal deformity. A morbidity report.

Members of the British Scoliosis Society were circulated a questionnaire in order to establish the morbidity of surgery for spinal deformity in the years 1983 and 1984 in Great Britain. Surgeons were asked to report the complications relating to all types of surgery for spinal deformity in order to establish the relative morbidity of segmental spinal wiring. Of the 1,121 patients reported, 1.4% suffered neurologic complications. In straightforward surgery for adolescent idiopathic scoliosis, there were four serious neurologic complications: three with Harri-Luque and one with routine Harrington distraction instrumentation. A plea is made that morbidity studies of spinal deformity surgery should compare all types of instrumentation and should be sufficiently detailed to allow statistical comparison.

Bone Wires↗
PubMed1989

[Idiopathic granulomatous hepatitis and lymphoma of serous membranes].

We described the case of a woman with idiopathic granulomatous hepatitis who developed a type B lymphoma with serous effusion six years later. This association raised the hypothesis that sarcoidosis or lymphoma could present as idiopathic liver granuloma. We suggest that lymphoma developed in our patient as a consequence of the granulomatous hepatitis. This lymphoma was particular because only sera were involved.

Ascitic Fluid↗
PubMed1989

Segmental spinal instrumentation. A study of the mechanical properties of materials used for sublaminar fixation.

Segmental spinal instrumentation with sublaminar fixation is widely used but a variety of materials and techniques are being employed for both scoliosis and other spinal surgery. This study addresses the question as to which is best. Both the materials and the methods of securing them were studied. The materials tested were stainless steel 316L, Ortron 90 high nitrogen steel, titanium alloys, nylon straps, and Mersilene tapes. Doubled cold-worked 00.84-mm diameter stainless steel formed in a knot with a twist proved to be the strongest and most secure means of fixation with a yield value of 1,610 N. Attention to the details of technique and material such as the incorporation of a secondary twist and avoidance of hot-worked stainless steel may reduce the incidence of implant failure.

Bone Wires↗
PubMed1987

Luque segmental spinal instrumentation: the use of the Hartshill rectangle.

This article describes the use of the Hartshill rectangle for the correction of spinal deformity. The Hartshill system is a modification of the Luque method of segmental spinal instrumentation whereby rather than two separate "L" rods a welded rectangle is formed from a single stainless steel rod. A "roof" is bent into each end of the rectangle so that it conforms with the lamina. The Hartshill rectangle avoids the problems of overlapping L rods and gives increased stability and correction of rotation.

Humans↗
PubMed1986

Internal fixation of the lumbar spine. The Hartshill rectangle.

The Hartshill rectangle fixation is a modification of the Luque system of segmental spinal instrumentation. The rectangle is formed from a 3/16-in stainless steel rod and incorporates a roof that allows it to fit snugly against the lamina and provides good rotational stability. The rectangle is secured to the spine by means of doubled 0.91-mm-diameter stainless steel wires. The technique of the Hartshill system in the lumbar spine is described in detail. The system has been used in 71 patients with good relief of pain and without major complication. In the first 45 cases, a simple, flat, unwelded rectangle was used, and in the last 26 the Hartshill rectangle was employed.

Adolescent↗