variations in the orthotic management of cerebral palsy
TRANSCRIPT
© 2002 Blackwell Science Ltd 139
Variations in the orthotic management ofcerebral palsy
Christopher Morris,* Helen Newdick† and Ann Johnson†
*Department of Orthotics, Nuffield Orthopaedic Centre NHS Trust, Oxford, and †Oxford Register of EarlyChildhood Impairment, National Perinatal Epidemiological Unit, Institute of Health Sciences, University ofOxford, Oxford, UK
Accepted for publication 30 November 2001
AbstractO b j e ct i ve Anecdotal reports that children with cerebral palsy were provided different orthoses in
two adjacent UK health districts were investigated using an observational comparative case study.
M e t h od The populations were compared using an epidemiological register of children with
cerebral palsy, which confirmed that a comparable health service response could be expected.
Merging data from the register with the orthotic patient database facilitated comparison of the
orthoses prescribed in each district. A survey questionnaire was used to gather the perceptions of
clinicians in both districts to understand how each team decides which orthosis to prescribe.
R e s u l t s There was considerable variation in the types of orthoses prescribed between districts, and
particularly of ankle foot orthoses. Survey respondents from the same profession described having
the same roles, although clinicians expressed different responsibilities for initiating and sanctioning
orthotic prescriptions in their district programmes.The survey also suggested that most clinicians
were uncertain when prescribing orthoses, and clinical practice was therefore largely determined by
professional preference.
C o n c l u s i o n Defining the spectrum of activity limitation in geographically defined populations
would enhance health services research and assist in the development of trials using different
interventions to reduce those limitations.
Correspondence:Department of Orthotics,Nuffield Orthopaedic CentreNHS Trust, Oxford OX3 7LD,UKE-mail:[email protected]
Original Article
Keywordscerebral palsy, orthoses,multidisciplinary,epidemiology
Background
The evaluation of health services for children with
cerebral palsy is a neglected area of research.
Despite this, a variety of medical, surgical and
therapeutic interventions is used in an attempt to
reduce the musculoskeletal deformities and activity
limitations that result from the effect of growth on
the neurologically impaired child. These include
orthopaedic and neurosurgical procedures and
drugs that may be administered orally, intramuscu-
larly or intrathecally. Alongside these medically
delivered interventions, children frequently receive
occupational therapy and physiotherapy, tempo-
rary casting or splinting and orthoses. Orthoses
are externally applied devices used to modify struc-
tural and functional characteristics of the neuro-
muscular and skeletal systems by exerting forces
on the body (International Organization for
Standardization 1989; Bowker et al. 1993). Contem-
porary orthoses are usually custom-fabricated from
thermoplastics that are moulded over rectified plas-
ter models of the affected part of the body. The
organization of services providing orthoses in the
UK National Health Service (NHS) was shown to
be highly variable between districts (Audit
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Commission 2000). Similarly, healthcare pro-
grammes for childhood disability in the UK are
organized at a local district level and are also deliv-
ered in a variety of ways (McConachie et al. 1999).
Organizing the delivery of multidisciplinary health
services is of course a complex challenge. However,
previous descriptions of child disability services, by
Robards (1994) for example, have not incorporated
many of the specialist services that are often essen-
tial for children with cerebral palsy, such as
orthopaedics, orthotics, assistive technology and
wheelchairs.
The assessment of a specific child’s needs and the
setting of treatment goals may result in a referral for
an orthosis as part of a physical management plan.
The treatment goals, which may target structural
(impairment) problems or overcoming activity
limitations, must be transformed into realistic bio-
mechanical objectives to allow a specific design of
orthosis to be made. Members of the team then
need to encourage acceptance of the orthosis and
evaluate whether the contribution of the orthosis to
the overall plan has enabled the treatment goals to
be achieved. Further details of the orthotic supply
process are described by Condie & Stewart 1997).
Evidence-based practice in the selection of
orthotic designs for children with cerebral palsy is
undermined by studies that have been poorly
designed and have included small numbers of
children with short follow-up periods (Condie &
Meadows 1995; Morris 2001). The difficulties in
mounting randomized controlled trials in this
population are well recognized (Davidson 1999;
McConachie 1999). As cerebral palsy is a heteroge-
neous condition with a wide range of neurological
impairment, assembling groups of children with
comparable baseline characteristics for recruitment
into a trial can be perceived as an obstacle. There is
also the difficulty of ascertaining clear and simply
measured outcomes. Perhaps the most difficult
problems to overcome are the strongly held views of
clinicians and families on the relative values of dif-
ferent treatment approaches that prevail in the
absence of good evidence.
The opportunity for the research study reported
here arose from discussions among orthotists
working at the Nuffield Orthopaedic Centre NHS
Trust (NOC) in Oxford during the 1990s. The NOC
had provided the primary clinical and technical
orthotic service in the two adjacent health districts
of Oxfordshire and West Berkshire. Anecdotally,
orthotists had described being asked to provide
quite different orthoses to apparently similar chil-
dren with spastic equinus of the foot and ankle
depending on whether they were in Oxfordshire or
West Berkshire. In this study, we addressed the fol-
lowing questions:
1 Do the populations of children with cerebral
palsy in each district present similar needs for
health services?
2 To what extent does orthotic prescription vary
for children with cerebral palsy between different
districts?
3 How do the multidisciplinary teams in each
district make decisions about which orthosis to
prescribe?
Methods
An observational comparative case study of the
health services provided in two geographically
defined adjacent districts was conducted, gathering
mixed quantitative and qualitative methods within
an established programme evaluation framework
(Centers for Disease Control & Prevention 1999).
Characteristics of populations
The Oxford Register of Early Childhood
Impairment (ORECI) was used to compare the
populations with cerebral palsy in each district.
Since 1984, ORECI has monitored the prevalence
of children with cerebral palsy born to mothers
resident in the four counties of Buckinghamshire,
Northamptonshire, Berkshire and Oxfordshire. In
addition, the register includes information on chil-
dren with cerebral palsy who move into the area.
When cases of cerebral palsy are confirmed on the
register, usually at age 5 years, the paediatrician
completes a questionnaire about the child that
records various aspects of their physical character-
istics.With the approval of the ORECI management
committee, anonymous data were extracted on 452
children with a confirmed diagnosis of cerebral
palsy aged between 5 and 16 years. After excluding
Variations in the orthotic management of cerebral palsy 141
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children who had died (42 children) or were now
residing outside the two districts of interest (42
children), 370 remained (Oxfordshire 193 and West
Berkshire 177). These data were used to compare
the baseline characteristics of the populations in
each district and to judge whether they present
similar needs for physical management.
Orthotic prescription
The NOC orthotic patient database was used to
review retrospectively the orthoses prescribed to
the children with cerebral palsy identified by
ORECI. At the time of the study, the orthotic
patient database at the NOC contained more than
4200 children who had been provided with
orthoses, born in or after 1984, from more than 20
districts and who have various but unrecorded
diagnoses. The orthotic database provided infor-
mation about both the type of orthosis and the
medical prescriber for a 9-month period between 1
August 1999 and 30 April 2000. The time interval
was limited by the new orthotic information tech-
nology (IT) system and would not necessarily cap-
ture all the children on the register using orthoses. It
takes an average of 10 months and up to 18 months
for a child to outgrow their ankle foot orthosis
(AFO) (Supan & Hovorka 1995).
Children with a confirmed diagnosis of cerebral
palsy who had been provided orthoses were identi-
fied by bringing the databases into a common for-
mat and using the date of birth and gender of each
child to retrieve a child’s name from the orthotic
database. The ORECI database manager then
checked the information and confirmed that 198 of
these names were matched with the correct unique
identifier on the register. A report of the types of
orthoses that had been provided for the children
during the 9 months was then produced. The pro-
portions of children with cerebral palsy in each dis-
trict that were prescribed specific orthoses were
compared.
Clinician survey
A sample of service providers in the programme
was invited to participate in a cross-sectional sur-
vey. This was designed to collect quantitative infor-
mation about indicators of the structure, processes
and outcomes of each district programme in-
cluding how the decision was made to prescribe
orthoses in each district.
Sample selection criteria
Orthoses are provided within multidisciplinary
physical management programmes that span hos-
pital and community health services. The survey
invited all the healthcare professionals regularly
involved in the process of orthotic prescription
identified by the lead author as a participant
observer. A subsample of general practitioners was
invited to participate, represented by the Chairs of
the then Primary Care Groups. The questionnaire
was distributed to the target population by post or
through members of the steering committee who
acted as gatekeepers to the larger professional
groups (physiotherapists, paediatricians and
orthotists).
Questionnaire development
The survey document was developed with open
and closed questions in four sections: professional
background, interprofessional communication,
multidisciplinary working and clinical practices
relevant to orthotic management (a copy of the
questionnaire can be obtained from the lead
author). In the ‘professional background’ section,
respondents indicated their profession, the district
in which they worked and the locations where they
saw children with cerebral palsy. These were used
as indicators of the structure of the programme.
Clinicians recorded their familiarity with the bio-
mechanical (musculoskeletal), neurodevelopmen-
tal and conductive education paradigms, identified
by Bower (1999), and also described their own
professional role. In the ‘interprofessional commu-
nication’ and ‘multidisciplinary working’ sections,
the survey gathered the service providers’ percep-
tions of indicators of programme efficiency and the
equity of services as part of a larger study (Morris
2000). In the ‘clinical practice’ section, participants
were asked categorically whether they were aware of
variations in orthotic management and, in open
questions, how they decide which orthosis to pre-
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scribe and how they involved the parents in the
decision. Open questions were designed to remove
the constraints of predetermined categories of
answers and to encourage respondents to express
their own perceptions of the programme. An
opportunity for respondents to add their own com-
ments was included at the end of the questionnaire.
This gathered many comments on the programmes
that were not elicited by responses to specific
questions.
Questionnaire analysis and validation
The text responses were systematically transcribed
in full, organized and coded using content analysis
and the identification of themes. The frequency
of responses to closed questions was coded and
analysed quantitatively using an SPSS database with
the profession and district in which the respondents
worked as the independent variables. The findings
were then presented to the same survey sample for
respondent validation. The validation process
offered all participants the opportunity to com-
ment on a report of the survey and observational
findings, in particular to ensure that individual
quotes had not been used out of context.
Results
Comparing district populations
The characteristics of the populations of cerebral
palsy were compared between Oxfordshire and
West Berkshire, and the findings are shown in
Table 1.
There are more boys than girls affected in both
districts (difference = 0.06, 95% CI –0.49 to 0.15).
Children classified with spastic cerebral palsy
account for the largest group in each district (89%
in Oxfordshire and 80% in West Berkshire). The
differences in diagnosis between the districts was
significant (c2 = 9.6295, d.f. = 3, p < 0.05). This
appears to result from the higher proportions of
spastic impairments reported in Oxfordshire and
the higher proportion with dyskinetic diagnoses in
West Berkshire. More children with ‘spastic’ cere-
bral palsy were described with impairments affect-
Table 1. Comparison of the populations of children with cerebral palsy in Oxfordshire and West Berkshire
WestBerkshire Oxfordshire Total
n (%) n (%) n (%) Diff. 95% CI z P
Female 77 (44) 74 (38) 151 (41)Male 100 (56) 119 (62) 219 (59) 0.06 -0.49 to 0.15 1.01 >0.2Diagnosis (SCPE classification)
Spastic 141 (80) 171 (89) 312 (84)Dyskinetic 21 (12) 8 (4) 29 (8) c2 = 9.6295 d.f. = 3 <0.05Ataxia 10 (6) 6 (3) 16 (4)Unclassifiable 5 (3) 8 (4) 13 (4)
Extent of spastic motor impairmentBilateral 79 (45) 102 (53) 181 (49)Hemiplegia 62 (35) 69 (36) 131 (35) c2 = 0.4165 d.f. = 1 >0.2Not spastic 36 (20) 22 (11) 58 (16)
Walking ability (one case of missing data)Not walking 41 (23) 59 (31) 100 (27)Restricting lifestyle 32 (18) 36 (19) 68 (18) c2 = 0.302, d.f. = 3 >0.2Functional/non-fluent 87 (49) 75 (39) 162 (44)Walks fluently 17 (10) 22 (11) 39 (11)
Contractures (seven cases of missing data)Total with contractures 48 (27) 78 (40) 126 (34) 0.13 0.04 to 0.24 2.70 <0.01Spastic 43 (24) 74 (38) 117 (32)Dyskinetic 5 (3) 3 (2) 8 (2)Ataxia - - - - - -Unclassifiable - - 1 - 1 (0.3)
Total 177 193 370
Variations in the orthotic management of cerebral palsy 143
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ing both sides of their body in Oxfordshire (53%)
than in West Berkshire (45%). However, excluding
those children classified with the non-spastic
subtype, the difference between the proportions
of bilaterally and unilaterally (hemiplegic) spastic
cases in each district was not significant
(c2 = 0.4165, d.f. = 1, p > 0.2). There were similar
proportions in each of the walking ability categories
in each district (c2 = 3.418, d.f. = 3, p > 0.2).
Although there were more children classified
as ‘functional but not fluent’ walkers in West
Berkshire, the differences between the other strata
were not statistically significant. The frequency that
children were reported as having joint contrac-
tures in each district subdivided by SCPE diagnostic
classification (Surveillance of Cerebral Palsy in
Europe 2000) is also shown in Table 1. However, it
should be noted that, although hip, knee and ankle
were more commonly reported in supporting text,
upper and lower limb contractures could not be
satisfactorily separated in the data, and both were
included in the analysis. Contractures were more
likely in children with spastic or dyskinetic cerebral
palsy than for those with ataxic or unclassifiable
impairments. Children were more frequently
reported as having contractures at age 5 years in
Oxfordshire (78/193, 40%) than in West Berkshire
(48/177, 27%): the difference was 13% (95% CI
0.04 to 0.23).
There was evidence of a correlation between
walking ability at 5 years of age and the presence of
contractures reported to ORECI (Table 2). The
findings show that children who were not walking
were twice as likely to have been reported to have
joint contractures when compared with those with
any walking ability: relative risk (RR) = 2.51 (95%
CI 1.93 to 3.26). The increased risk of contractures
for children who were not walking was a consistent
finding relative to all the walking ability categories.
These relative risks were ‘not walking’ vs.‘restricting
lifestyle’: RR = 1.44 (95% CI 1.05 to 1.98); ‘not walk-
ing’ vs. ‘functional/non-fluent’: RR = 2.78 (95% CI
2.00 to 3.85); and ‘not walking’ vs. ‘walks fluently’:
RR = 1.99 (95% CI 1.50 to 2.52).
Comparing orthotic prescription
Half the children recorded with ORECI in both
districts were prescribed orthoses in the sample
9-month period (Oxfordshire 49% and West
Berkshire 48%). There were 89 children in
Oxfordshire who had received 123 orthotic prescri-
ptions and 80 children in West Berkshire who had
received 114 prescriptions. Children in Oxfordshire
were principally referred for orthotic management
by a single orthopaedic surgeon (85 referrals, 96%)
and in West Berkshire primarily by one paediatri-
cian (46 referrals, 57%) or a single orthopaedic sur-
geon (34 referrals, 43%). There was a wide range of
orthoses prescribed for all parts of the body detect-
ed by the merging process. However, the anecdotal
reports related to lower limb orthoses, and it is these
that are shown in Fig. 1.
The variation between districts was most notable
in the prescription of rigid designs of AFOs:
Oxfordshire 54/89 children or 61% (95% CI 51 to
71%); West Berkshire only 17/80 children or 21%
(95% CI 12 to 30%). The difference in the propor-
tions of children prescribed rigid AFOs in each dis-
trict was significant: 40% (95% CI 27 to 53%).
There was also a difference in the greater propor-
tion of children prescribed footwear in West
Berkshire (42/80, 53%) compared with Oxfordshire
(25/89 or 29%): difference = 24% (95% CI 10 to
39%). Only one child was prescribed a pair of
supramalleolar DAFOs in Oxfordshire, but 17 chil-
dren were prescribed these in West Berkshire.
Further statistical analyses of the differences in
Contractures
Yes % No % Total
Not walking 60 62.5 36 37.5 96Restricting lifestyle 29 43.3 38 56.7 67Functional/non-fluent 36 22.5 124 77.5 160Walks fluently 1 2.7 37 97.3 38
Total 126 235 361
Table 2. Cases identified withcontractures in both districtsstratified by walking ability (ninecases of missing data)
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orthotic prescriptions between districts was not
appropriate, as the numbers for some orthoses
were small, and some children received more than
one orthosis. It was discovered later that, in
Oxfordshire, a small proportion of children’s
orthopaedic footwear is purchased directly from
suppliers by physiotherapists and including these
might reduce the difference in prescribed footwear.
Oxfordshire children were also more frequently
prescribed heel cups, wrist orthoses and shoe raises.
West Berkshire children were more often prescribed
spinal orthoses, head supports and protective hel-
mets during the 9 months in which data were
gathered.
Clinician survey
In total, 49 clinicians responded from eight pro-
fessions who were equally representative of the
teams working in Oxfordshire and West Berkshire.
These included two paediatric neurologists, two
orthopaedic surgeons, 12 hospital or community
paediatricians, 23 hospital and community-based
physiotherapists, seven orthotists and four general
practitioners.
Programme structure
Responding clinicians from each district were
employed by at least three separately managed NHS
Trusts. Together, the different professions described
seeing children at several hospital sites and numer-
ous school locations.
Treatment paradigms
Although each discipline described similar profes-
sional roles in both districts, the survey indicated
that there were differences in the treatment para-
digms that guide their clinical practice. Almost all
the respondents were aware of each of the therapeu-
tic paradigms offered in the question. Most clini-
cians in Oxfordshire (22/27; > 80% of respondents)
and the majority in West Berkshire (13/21; > 60%)
were regularly using the biomechanical paradigm.
As the ‘neurodevelopmental’ and ‘conductive edu-
cation’ paradigms are primarily therapy orientated,
few clinicians indicated using these except physio-
therapists. Many physiotherapists are therefore
integrating different complex treatment paradigms
that attempt to blend the objectives of medical and
Figure 1. Bar chart showing frequency with which different lower limb orthoses were prescribed.
Variations in the orthotic management of cerebral palsy 145
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educational philosophies. One physiotherapist
described how:
‘All the therapies tend to have individual goals
and the paediatricians/orthopaedic surgeons
another set. Once the child is school age, the two
are more difficult to integrate, and education
have yet another set’.
Orthotic prescription
Most professionals indicated that they were aware
that there were variations in orthotic management
(14/17 in West Berkshire, 22/24 in Oxfordshire and
3/3 working in both districts). One community
physiotherapist commented that:
‘Different areas/localities seem to have different
ideas of the intended effect of DAFOs and differ-
ent ways of actually producing them – as I see
children from different areas in school, their
orthotics vary considerably’.
The themes that emerged from respondents
relating to how orthotic prescriptions are made in
each district were divided into ‘responsibility for
authorizing prescriptions’ and ‘factors affecting
orthotic prescription’.
Responsibility for prescribing orthoses
Although referrals for orthoses are often initiated
by physiotherapists, all orthotic prescriptions have
to be formally sanctioned by a doctor. In both dis-
tricts, an orthopaedic surgeon prescribes and, in
West Berkshire, paediatricians also sanction pre-
scriptions. However, this may be perceived purely as
an administrative procedure in some instances;
some prescribers conceded not being knowledge-
able about orthoses, and physiotherapists were
often influential on the choice of orthosis, as a pae-
diatrician in West Berkshire indicated:
‘I am advised by the physiotherapist at the Child
Development Centre’.
A community physiotherapist observed that the
actual prescription:
‘Often depends on the preferences of the budget
holder’.
Factors influencing orthotic prescription
Clinicians in both districts reported making col-
laborative decisions for prescribing orthoses, and
many involved the family in the decision. However,
the provision of consistent information appeared
unlikely, as respondents indicated using different
treatment paradigms and personal preferences. In
the absence of a clear and evidence-based prescrip-
tion protocol, therefore, the decision remains
largely a matter of opinion.An orthopaedic surgeon
described how:
‘Several disciplines are usually involved and
opinions on management of problems may
vary’.
Discussion
The populations of children with cerebral palsy in
each district were similar in gender mix, propor-
tions of bilaterally and hemiplegic spastic cases and
walking ability. There appeared to be differences in
the diagnostic classification and in the proportion
of children reported to have contractures in each
district. The difficulty in consistently classifying
children with cerebral palsy is a prevailing issue in
the epidemiology of the condition (Williams &
Alberman 1998). Although the European group has
simplified the procedure with a flowchart recently
(Surveillance of Cerebral Palsy in Europe 2000), the
findings in this study rely upon the criteria used
by various assessors since 1984. Possible reasons
for the increased reports of contractures in
Oxfordshire are that children in Oxfordshire are
more seriously affected, or it may result from the
higher proportion of children with spastic impair-
ments developing contractures more frequently.
Using data from both districts, there was an
increased risk of non-ambulant children develop-
ing contractures compared with children with any
walking ability. This finding, that the more severely
affected children may be at greater risk of defor-
mity, may be known intuitively but has not pre-
viously been demonstrated statistically. Some
children in each district will need more intensive
healthcare because of their increased risk of defor-
mity and disability. A measure of the severity of
activity limitations may now be more reliably
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recorded using the Gross Motor Function
Classification System (GMFCS) (Palisano et al.
1997). Knowledge of the spectrum of activity limi-
tation using the five levels of the GMFCS will be a
more appropriate indicator for comparing popu-
lation needs for health services.
There is strong evidence from routinely collected
data that the prescription of orthoses for children
with cerebral palsy varies between the districts of
Oxfordshire and West Berkshire. Although some
variation in the physical management of individual
children would be expected as a result of the hetero-
geneity of the cerebral palsy diagnoses, the variation
in numbers and types of orthoses used in the two
districts goes beyond what would be expected in
similar populations. The variation in the use of
rigid ankle orthoses suggests that a predominantly
biomechanical programme has been delivered in
Oxfordshire and a more neurodevelopmental
therapy-orientated programme in West Berkshire.
The variations in orthotic prescription are an indi-
cator of the conflicting principles that underpin the
healthcare programmes delivered in the two dis-
tricts and a result of the lack of evidence to support
either treatment regimen. The survey findings must
be interpreted cautiously: the sample of clinicians
was derived from observation of the orthotic pre-
scription process by the lead author and, although
many clinicians were interested in the study,
respondents may have been those with stronger
preferences. The respondent validation process and
subsequent presentation of the findings to clini-
cians, however, supported our interpretation.
The survey illustrated the complexity of multi-
disciplinary team structures with different clini-
cians advising families in different locations.
Information that professionals provide to families
when prescribing orthoses was shown to be influ-
enced by individual preferences and hence incon-
sistent. This represents a formidable challenge.
Perhaps it is time to reconsider health service pro-
grammes for children with cerebral palsy using the
values and standards proposed by the European
Academy of Childhood Disability Working Group
on ‘Services for Children with Disabilities in
European Countries’. This report stated the impor-
tance of goal-orientated treatment programmes
adapted to the preferences of the child and family
and emphasized multidisciplinary team work and
co-ordination (McConachie et al. 1997). Identify-
ing the perceptions of families about the process of
healthcare delivery has highlighted the key issues of
information exchange, respectful and supportive
care and family professional partnership and
enabling families to make their own decisions
(Rosenbaum et al. 1992). Associations are evident
between these interpersonal aspects of providing
healthcare and client satisfaction, stress and adher-
ence to individual treatment regimens (King et al.
1996), the latter being particularly important if
orthoses are to be worn regularly within the family
setting.
Conclusions
There is a need for prescribers to identify the chil-
dren with cerebral palsy for whom the long-term
outcomes of specific interventions remain uncer-
tain. This can then be discussed openly with the
family. Further, as the ‘uncertainty principle’ is the
ethical foundation for randomly allocating differ-
ent interventions in clinical trials, is it indeed more
acceptable given the current inconsistencies?
The GMFCS will be used to define a spectrum of
activity limitation in complete populations and
could also be used to monitor baseline characteris-
tics between children receiving different interven-
tions in a clinical trial. Should further research be
attempted, collaboration between centres would be
necessary to conduct large enough randomized
controlled trials to detect the moderate differences
that are likely to exist between treatment groups
(Yusuf et al. 1984). This would ensure that the care
we provide in the future will be more evidence
based.
Acknowledgements
This study would not have been possible without
the interest and support of the members of the
project steering committee and the clinicians who
returned questionnaires. The research was part of
the thesis submitted by the lead author towards
the MSc in Evidence-Based Health Care at the
University of Oxford. I would like to thank my
supervisor Janet Harris, the teaching faculty and the
Variations in the orthotic management of cerebral palsy 147
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Orthotic Education and Training Trust who sup-
ported the tuition fees. The Management Group
of the Oxford Register of Early Childhood
Impairment (ORECI) approved the release of
register data for this study. ORECI is funded by the
South-East NHS Executive.
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