15 research outputs found
Spinal stenosis
This thesis describes in detail the clinical spectrum of spinal stenosis
in a series of two hundred and twenty-one patients at the
Nuffield Orthopaedic Centre. It depicts those conditions with which spinal
stenosis may be confused, and other conditions with which it is associated.
Characteristic symptoms and physical signs are reported and the role and
value of different methods of investigation are discussed.
The aetiology and pathogenesis of spinal stenosis is discussed and the
emphasis turned away from absolute measurements of the dimensions of the
bony spinal canal, towards the role of the soft tissues and the dynamic
response of the canal and its neural contents to postural change and loading,
as evidenced by erect flexion and extension radiculography. The spinal
reserve capacity measurement on CT approaches more closely the ideal of
measurement of volumetric disproportion of canal and contents, but it takes
no account of the dynamics of the canal. Magnetic Resonance Imaging may,
in the future, provide the most objective criteria for diagnosis if section
thickness can be reduced.
Experimental spinal stenosis was produced in a group of immature
New Zealand white rabbits. This was induced by sublaminar wiring at three
levels at the age of eight weeks and allowing the animals to grow for
twenty-four months before sacrifice and analysis of the spines. The effect
of sublaminar wiring on the growth and development of the lamina and
spinal canal was analysed using a Kontron Ibas Image Analysis Computer,
and the results described and statistically analysed.
The results of surgery were analysed in detail in a group of seventytwo
patients with spinal stenosis at the Nuffield Orthopaedic Centre. The
long-term results were compared with the initial post-operative result and
two groups were identified: the stable result and the unstable result. The
indications for and results of re-operation were also analysed in a group
of twelve patients. Improved understanding of the aetiology of spinal stenosis has enhanced
surgical management and results. The extent of surgical decompression
must be precisely planned pre-operatively from radiographic and CT studies,
and the surgeon must be able to execute this plan at operation. There is
now no place for exploratory operations. The objective of surgery is
adequate nerve root decompression without spinal de-stabilisation and when
this is achieved, re-operation is redundant