PubMed Health⌕ Search

Biomedical subjects

R Aldegheri

Publications and source records attributed to R Aldegheri.

At least 19 recordsLinked to original sources
PubMed1989

Epiphyseal distraction. Chondrodiatasis.

Chondrodiatasis is a limb-lengthening technique involving slow, controlled, symmetric epiphyseal distraction. The clinical and histological differences between this technique and distraction epiphysiolysis are described. Results are given for the elongation of 170 bone segments in 75 children (41 with limb-length discrepancies and 34 with achondroplasia). All patients were operated upon while the growth plate was still open with maximum bone maturation corresponding to Risser 2.

Achondroplasia↗
PubMed1989

Epiphyseal distraction. Hemichondrodiatasis.

Hemichondrodiatasis is a technique of closed, gradual, asymmetric distraction of the growth plate to correct angular deformities in growing children. This report describes the technique and the results achieved in 35 operated lower extremity segments, 14 involving the femur and 21 involving the tibia. The best results were achieved in posttraumatic deformities when the bone bridge occupied less than 20%-30% of the epiphyseal plate. The procedure is best performed toward the end of growth, or earlier if a progressive deformity exceeds 15 degrees - 20 degrees.

Adolescent↗
PubMed1989

The callotasis method of limb lengthening.

Callotasis is a lengthening technique that involves slow, controlled distraction after subperiosteal-submetaphyseal osteotomy. The technique and its advantages over other methods are described. Results of lengthenings involving 270 operated bone segments (146 femurs and 124 tibias) in 140 patients are reviewed. Ninety-five patients had limb-length inequality and 45 had hypochondroplasia or achondroplasia. On average, 6.6 cm, or 24.6% of initial length, was gained. The mean healing index was 39; the complication rate was 13.3%.

Achondroplasia↗
PubMed1988

Limb lengthening by diaphyseal corticotomy, callus distraction, and dynamic axial fixation. An experimental study in the ovine femur.

Limb lengthening of the left femur was performed in 12 sheep, 7-8 months of age. After weakening of the cortex by drill holes, a controlled fracture was created in the diaphysis. The bone segments were fixed in reduced position using a unilateral external fixation device. The fixator was left in neutral position for 10 days postoperatively when lengthening started. By means of daily distraction at a rate of 1.0 mm once a day for 3 weeks, an average lengthening of 1.9 cm (11.9%) was obtained. Two weeks after distraction had been discontinued, distinct callus bridging of the lengthening zone was confirmed radiographically in all animals. At this time the rigid state of fixation was converted to a system allowing axial compression by loading in half the animals. The other half of the animals served as controls with the fixator remaining unchanged. The external device was left on until 5 weeks after the end of distraction. At this time the animals were killed. Both femora of all animals were tested mechanically in torsion. The average ultimate torsional strength of the elongated femur compared with control was 71% in the group with dynamic axial fixation and 65% in the control group. No significant difference in relative strength of the tested bones in the two groups was found. We conclude that intermittent axial compression by loading during consolidation had no significant effect on the bone-healing process evaluated by radiography and mechanical testing.

Animals↗
PubMed1988

Surgical correction of short stature.

The aim of surgical orthopaedics in short stature is to increase overall height and improve body proportions. It is particularly applicable to lower limb lengthening in achondroplasia, hypochondroplasia, Turner's syndrome and Ellis-van Creveld syndrome. Two methods are routinely used in Verona: chondrodiatasis and callotasis. Although simultaneous lengthening of tibia and femur of the same limb have generally been employed, recent efforts have concentrated on simultaneous lengthening of one femur and the contralateral tibia. Lengthening of up to 20-25 cm can now be achieved, with a complication rate below 20%.

Achondroplasia↗
PubMed1986

Limb lengthening by distraction of the epiphyseal plate. A comparison of two techniques in the rabbit.

We have compared, in rabbits, two techniques of limb lengthening by distraction of the epiphyseal plate using a unilateral external fixation frame. In all cases, 14 mm of symmetrical lengthening without deviation was achieved. With rapid distraction at rates of 1 mm per day (distractional epiphyseolysis) separation of the epiphysis from the metaphysis occurred by day 7, and by day 70 almost complete ossification of the cartilage and the elongated segment was evident. In contrast, slow distraction at 0.25 mm every 12 hours (chondrodiatasis) produced hyperplasia of growth cartilage without any evidence of detachment at 28 days, the end of the distraction period. By day 70 the epiphyseal plate had returned to normal thickness with normal cellular morphology, while the lengthened segment was occupied by ossified tissue. The significance of these findings is discussed.

Animals↗
PubMed1986

Chondrodiatasis-controlled symmetrical distraction of the epiphyseal plate. Limb lengthening in children.

We describe a technique for slow, progressive, symmetrical distraction of the growth plate using a lightweight dynamic axial fixation system. Results are given for the elongation of 40 bony segments in children with limb-length discrepancies and 60 segments in children with achondroplasia or hypochondroplasia. Increases in limb length of up to 36% were obtained in non-achondroplastic and up to 64.5% in achondroplastic patients. There were no nerve or vascular lesions or bony infections and no case required a bone graft. Pin-track complications occurred in only 1.5%.

Achondroplasia↗
PubMed1986

Dynamic axial fixation. A rational alternative for the external fixation of fractures.

Conventional external fixation systems neither inhibit motion at the fracture site sufficiently to permit primary bone healing, nor do they allow sufficient motion to encourage adequate external callus formation. Healing with such systems is therefore prolonged. These methods are usually reserved for the most severe fractures when internal fixation may be contraindicated. A unilateral, dynamic axial fixation system (Orthofix - registered trademark) is described which allows for simple conversion from a rigid to a dynamic mode, and so can be readily adapted to the changing physiological patterns of fracture repair. In 288 fresh fractures a success rate of 94% was achieved, with an average time to healing of 4.4 months. The incidence of pin-track infection was only 0.6%. The contribution which the mechanical and design features of the apparatus make to the results obtained is discussed. It is suggested that the system is capable of extending the range of indications for an externally mounted system to include many cases which would formerly have been treated by internal fixation, plaster cast or traction.

Adult↗
PubMedDate not supplied

Limb lengthening by callus distraction (callotasis).

Callotasis is a new technique of limb lengthening involving slow distraction of the callus formed in response to a proximal submetaphyseal corticotomy. Using a dynamic axial fixator with telescoping capabilities, distraction begins after 2 weeks. When the required length is attained, the fixator is held in the rigid mode until radiographic evidence of callus is observed. The locking screw is then released, and dynamic axial loading is instituted to promote corticalization. One hundred bony segments have been lengthened; 50 patients had limb length inequality, and 23 had achondroplasia. The mean lengthening achieved was 22% (maximum, 58%). There were 14 complications (14%).

Achondroplasia↗
PubMedDate not supplied

[Reconstruction in loss of bony tissue].

The aetiology and pathogenesis of wide loss of bony tissue are discussed. Methods of treatment are described. Five cases thus treated and cured are reported.

Adolescent↗