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Biomedical subjects

R Aldegheri

Publications and source records attributed to R Aldegheri.

At least 37 records · Page 2Linked to original sources
PubMed1984

The treatment of fractures with a dynamic axial fixator.

The results obtained with a lightweight dynamic axial fixator in the treatment of fractures are reported. The apparatus comprises a single bar with articulating ends which clamp self-tapping screws and can be locked at an angle appropriate for axial alignment. A telescopic facility allows ready conversion from rigid to dynamic fixation once periosteal callus formation has commenced. Reduction and controlled distraction or compression are achieved by means of a detachable compressor unit. We treated 288 patients with fresh fractures and 50 with ununited fractures. The success rate for fresh fractures was 94%, with average healing times ranging from 3.4 to 6.5 months. In ununited fractures also, the success rate was 94% with average healing times ranging from 4.7 to 6.5 months. Complications were minimal. The device is versatile and can be applied in an average of 15 minutes. It permits ambulatory fracture care without sacrificing a sound anatomical result.

Adolescent↗
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

Nerve conduction changes during lower limb lengthening. Somatosensory evoked potentials (SEPs) and F-wave results.

The effect of lower limb lengthening on nerve conduction was investigated in 5 achondroplastic subjects who underwent callotasis on a "cross-over" basis. Somatosensory evoked potentials (SEPs) and F waves from the posterior tibial nerve (PTN) were studied preoperatively and then after removal of the axial fixators. SEPs at the end of lengthening showed that both the latency of the plexus potential (P9) and, albeit to a lesser extent, the interpeak time between the plexus and the spinal cord (N15) potentials were significantly increased. The central conduction time (N15-P33) and the amplitude of the scalp responses were not modified. The latencies of the F waves were much longer at the end of bone distraction than in basal conditions. The increases in both PTN SEPs and F-wave latencies are consistent with a slowing of conduction The extent of these latency shifts correlated closely with the degree of limb lengthening. We calculated that, on average, each cm of lengthening could produce 0.21 msec and 0.22 msec delays respectively, suggesting a similar effect of the stretching on both sensory and motor fibers. Our findings indicated that the damage could be widely distributed along the whole length of the nerve, affecting both the peripheral (trunk) and proximal (plexus and root) segments. The electrophysiological changes were not associated with any persistent clinical complaint.

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↗