Artigo (acupuntura) - Efeito placebo da acupuntura

Pain 106 (2003) 401–409
www.elsevier.com/locate/pain

The placebo needle, is it a valid and convincing placebo
for use in acupuncture trials? A randomised, single-blind,
cross-over pilot trial
Peter Whitea,*, George Lewitha, Val Hopwooda, Phil Prescottb
a
Complementary Medicine Research Unit, Mail Point OPH, Royal South Hants Hospital, University of Southampton, Brintons Terrace, Southampton, UK
b
Department of Mathematics, University of Southampton, Southampton, UK
Received 6 December 2002; received in revised form 1 July 2003; accepted 22 August 2003

Abstract
The issue of what constitutes an effective and realistic acupuncture placebo control has been a continuing problem for acupuncture
research. In order to provide an effective placebo, the control procedure must be convincing, visible and should mimic, in all respects, apart
from a physiological effect, the real active treatment. The ‘Streitberger’ needle might fulfil these criteria and this paper reports on a validation
study. This was a single-blind, randomised, cross-over pilot study. Patients were drawn from the orthopaedic hip and knee, joint replacement
waiting list. Intervention consisted of either 2 weeks of treatment with real acupuncture followed by 2 weeks on placebo, or vice versa. The
prime outcome was a needle sensation questionnaire and there was a range of secondary outcomes. Thirty-seven patients were randomised
and completed treatment. Groups were well balanced at baseline. No significant differences between groups or needle types were found for
any of the sensations measured. Most patients were unable to discriminate between the needles by penetration; however, nearly 40% were
able to detect a difference in treatment type between needles. No major differences in outcome between real and placebo needling could be
found. The fact that nearly 40% of subjects did not find that the two interventions were similar, however, raises some concerns with regard to
the wholesale adoption of this instrument as a standard acupuncture placebo. Further work on inter-tester reliability and standardisation of
technique is highly recommended before we can be confident about using this needle in further studies.
q 2003 International Association for the Study of Pain. Published by Elsevier B.V. All rights reserved.
Keywords: Acupuncture; Placebo; Placebo needle

1. Background In order to provide an effective and credible placebo
(defined as a physiologically inert procedure), the control
Research into the efficacy of acupuncture has raised a must be convincing and should mimic, in all respects, apart
number of difficult methodological issues, particularly in from a physiological effect, the real active treatment (Ernst
relation to the selection of appropriate controls. Separating and White, 1997; Peck and Coleman, 1991). Various control
the specific effects of acupuncture from its non-specific options have been utilised in the context of clinical research
effects is extremely difficult because acupuncture is a within acupuncture, i.e. insertion of acupuncture needles
physical, invasive, manual procedure involving consider- into non-acupuncture points, several forms of dummy
able practitioner time and some ritual. It is however, needling and mock TENS, but as yet none have fulfilled
important to be able to quantify the relative effects of these all the criterion simultaneously of being either truly inert,
two factors (Hammerschlag and Morris, 1997; de la Torre, easily usable and effective at mimicking real pragmatic
1993). Other possible confounding factors might be linked acupuncture.
to a patient’s preconceived ideas of efficacy around a To be truly credible in this context, a placebo should be
particular treatment regime and this too must be assessed as visible to the patient and it should appear as though the skin
part of a non-specific effect. is being penetrated, the Streitberger needle might fulfil these
criteria (Streitberger and Kleinhenz, 1998). As the needle is
* Corresponding author. Tel.: þ44-23-8082-5584; fax: þ 44-23-8082- pushed against the skin, it causes a pricking sensation but as
5243.
E-mail address: pjw1@soton.ac.uk (P. White).
increased pressure is applied, the shaft of the needle

0304-3959/$20.00 q 2003 International Association for the Study of Pain. Published by Elsevier B.V. All rights reserved.
doi:10.1016/j.pain.2003.08.013

402 P. White et al. / Pain 106 (2003) 401–409

disappears into the handle, mimicking a ‘stage dagger’. This the Southampton and South West Hants Joint Local
gives the impression that the needle is actually entering the Research Ethics Committee. All subjects were contacted
skin. The needle is held in position by a small adhesive by telephone or letter and asked to attend an assessment
plastic ring, which can also be used with the real needles to interview. Inclusion and exclusion criteria were as follows.
aid consistency and credibility. Streitberger evaluated this Inclusion criteria:
system on 60 volunteers who were subjected to both real and
placebo needling in a cross-over trial. Streitberger reported † Aged between 18 and 80 years with chronic/stable pain,
that 90% of subjects in the acupuncture group and 78% in predominantly from a single joint (hip or knee) of known
the placebo group felt needle penetration. No patients had mechanical aetiology (i.e. non-systemic).
suspected that their skin had not been punctured. It has been † Patients should score an average of 3 or more on the
pointed out, however, that the needles might not be visual analogue scale (VAS) in the pre-randomisation
appropriate for use in certain areas such as the scalp, toes phase of the study and not be on any current active
and fingers, also that there may be some limitation in the treatment (e.g. physiotherapy, homeopathic).
angle of needle insertion (Kaptchuk, 1998). Despite this the † Literate in English and able to attend clinic twice a
‘placebo’ needle (thus named by Streitberger) has been used week for duration of treatment.
in a clinical trial (Kleinhenz et al., 1999) and may offer for
the first time, a usable and believable non-penetrating Exclusion criteria:
acupuncture control.
Before this needle is adopted into general use however, † Pregnancy, serious comorbidity (including severe back
further validation needs to be undertaken. In particular an pain), recent (within 6 months for oral and 1 month for
understanding of inter-tester reliability needs to be exam- injection) or current steroid use and those waiting for
ined, i.e. do different practitioners achieve similar results hip/knee revision.
with similar treatments? † Needle phobia or allergy to sticking plaster.

Patients with previous experience of acupuncture were
2. Method not excluded for two reasons. Firstly because if a placebo
intervention is to have true validity, it must be able to be
2.1. Objectives ¨
used with both naıve and experienced patients, and secondly
because there is as yet no evidence to suggest that this
The primary objective of this study, therefore, was to ¨
needle should be confined to acupuncture naıve patients
provide independent validation of the credibility of the only. This was a single-blind cross-over trial, with subjects
Streitberger placebo needle and to compare the needling randomised to two practitioners and to two treatment
sensations for the two types of needles. Secondary sequences, involving real needles and placebo needles. A
objectives were to gain an indication of inter-tester flow chart of the trial is shown in Fig. 1.
reliability when using the placebo needle, and to ascertain
if subject’s pre-treatment belief in complementary and 2.3. Intervention
alternative medicine (CAM) has any influence on outcome.
A cross-over design was used so that each patient would All volunteers were assessed and informed consent was
be able to compare both needle types. At the end of each obtained along with a full medical history of the condition.
treatment period, patients were asked to complete a Patients were informed that we were testing two types of
questionnaire to assess the sensations felt on needling. needles, a conventional acupuncture needle and a new
Patients were also asked if they felt the needles go into the needle, either of which may be successful in treating their
skin. Designing the trial in this way enabled us to ascertain pain. They were also told that half of their treatments would
if patients were readily able to detect a difference between be placebo, but that they would not be told which these
the needles with regard to these parameters. Within-patient were. Whilst subjects were therefore blind to the type of
comparisons of these assessments were made using non- intervention they were receiving, it must be noted that the
parametric procedures. practitioners were aware of which needle was being used.
Patients were then instructed to complete a daily pain diary
2.2. Patient selection to record average daily pain on a VAS with a 10 cm line
ranging from ‘no pain’ to ‘worst pain imaginable’ for seven
Subjects were recruited from the orthopaedic hip/knee consecutive days during the baseline period. Subjects were
joint replacement waiting list at Southampton General also instructed to carry on taking their normal analgesia and
Hospital. It was felt that this would provide a source of to record this in their diary. One week later (second visit) the
subjects with a chronic yet fairly stable condition who were pain diary was examined and if the inclusion criteria (which
not undergoing concomitant treatment apart from were unknown to the patient) were satisfied, then randomi-
routine analgesia. Ethical approval was obtained from sation to practitioner and treatment sequence occurred and

P. White et al. / Pain 106 (2003) 401–409 403

The specific points for each individual were decided at
each treatment session depending on the distribution of pain
and local palpation (i.e. use of tender points). Point
prescription was changed if there was failure to improve.
Two or three local points and at least one distal point were
used. Even though this was not an efficacy study, this regime
was used because we felt it was important that the treatment
should reflect clinical practice. If the needles are ultimately
accepted as a valid control, then it is likely that they will be
¨
used in this way. Also, as acupuncture naive patients were
not excluded, the treatment experience should be as realistic
and pragmatic as possible. Point location and depth of
insertion was as described in traditional texts (Liangyue
et al., 1990). Placebo needles were applied using the same
point selection as for the real needles. Plastic ‘O’ rings and
adhesive plasters were used for both verum and placebo
interventions, as specified by Streitberger and Kleinhenz
(1998). Therefore, an average of four points were used on
each subject and deqi was obtained on each needle. A timer
was set for 20 min, the duration of each treatment. The
patient was checked three times (every 6 or 7 min) to
Fig. 1. Trial protocol. ascertain if deqi was present and to manipulate the needles
by rotating them about their own longitudinal axis. After
treatment was initiated. Patients were then seen twice a 20 min the needles were removed. Subjects were instructed
week for the first two weeks of treatment with either real to continue with their normal analgesia if needed and were
acupuncture needles or with the Streitberger placebo not given any other specific form of treatment (exercises,
needles. After 2 weeks, subjects were crossed over to the stretches, etc.).
other type of needle and treated for a further 2 weeks.
Although the initial pain assessments were used to decide 2.5. The practitioners
entry to the study, and further assessments of pain were
recorded on a daily basis during the 4 weeks of treatment, The first therapist (PW) (male) was trained in western
these efficacy assessments were not used to compare the acupuncture techniques on an Acupuncture Association of
patients’ sensitivity to the different types of needles. As Chartered Physiotherapists (AACP) accredited course and
described later, sensitivity to the needles was assessed had 7 years’ clinical experience in acupuncture. The second
following each treatment period using a series of questions therapist (VH) (female) was trained in the UK and China in
related to the kind of sensations experienced. both Western and Traditional Chinese Techniques and has
had 16 years of clinical experience.
2.4. The needle types: real and placebo acupuncture needles
2.6. Outcomes
The needles were single-use, sterile, copper-handle, pre-
packed needles without guide tubes. In order to maximise A range of outcomes was used in order to ascertain if
matching of needles, both the real (verum) and placebo there were any major differences between the two
needles were manufactured and supplied by Asia-Med and interventions.
Co., Munich. All needles were 25 mm £ 0.25 mm. Point
selection was based on individualised ‘western’ acupunc- 2.6.1. Primary outcomes
ture techniques using a pre-defined list of points (see The primary outcome was measured by a series of
Table 1). questions relating to needle sensation. These questions were
designed by Park (2000) and are intended to clarify and
Table 1 verify the sensations felt on needling and the similarity
Acupuncture point selection
between treatments. Four aspects of sensation, namely dull/
Hip Knee heavy (pulling, numb), radiating (spreading, pulsing,
throbbing), stinging (pricking, tingling) and electric (rather
Local points GB 30,31; UB 34; St 31 St 35, 36; Xiyan, GB 34; like when you bang your elbow), were each measured using
Sp 9; UB 39, 40 a VAS ranging from ‘not at all’ to ‘extremely severely’.
Distal points GB 34; UB 60 St 41; UB 60
Since the start of this study, the questionnaire has been
GB, gallbladder; UB, bladder; St, stomach. further amended and used in another trial (Park et al., 2002).

404 P. White et al. / Pain 106 (2003) 401–409

In the current study, the questionnaire was completed at the patient randomisation. Envelopes were consecutively num-
end of each 2-week period of treatment. Subjects were also bered within their respective groups and subjects were
asked to record their impression of the similarity of the allocated to treatment group using the next available
treatments received by comparing the treatment during the number.
first 2-week period with the last 2-week period using a VAS
ranging from ‘the same’ to ‘totally different’.
2.8. Statistical analysis
2.6.2. Secondary outcomes
2.6.2.1. Pain. This was measured in the form of a self- This study was designed as a cross-over trial with each
completed pain diary using a VAS and was measured daily patient receiving both the real needles and the placebo
for 1 week prior to and throughout treatment. Within-patient needles in sequence, each for a period of 2 weeks. At the end
mean scores were computed for the final week of treatment of each treatment period, patients were asked to complete
with each type of needle. the questionnaire (Park, 2000) assessing the sensations felt
on needling. The four kinds of sensation were assessed
2.6.2.2. Analgesia. Each patient kept a daily record (in the using a VAS ranging from ‘not at all’ to ‘extremely severe’.
diary) of his or her analgesia intake. It was required that Within-patient comparisons of these assessments were
patients should stay on current medication and simply made using non-parametric ranking procedures. Patients
record tablet intake. Patients were however free to reduce were also asked if they felt the needles go into the skin.
(or increase if appropriate) the dose of analgesia or non- McNemar’s test was used to compare these responses.
steroidal anti-inflammatory drugs as their pain dictated. Secondary outcome variables relating to pain and
analgesia intake were also compared using ranking methods.
2.6.2.3. Nottingham Health Profile (NHP). This is a quality The NHP scores were compared using a paired t-test.
of life questionnaire and was administered (a) prior to the Responses to the question relating to perceived overall
first treatment, (b) after the first two weeks of treatment and similarity, as measured on the VAS, were summarised using
(c) at the end of the trial. descriptive statistics and compared using a x2 test.

2.6.2.4. The Holistic Health Questionnaire (HHQ). This was
administered at baseline only. A similar questionnaire was
first developed by Finnigan (1991) and measured attitude to 3. Results
CAM. This was then further developed and validated
(Lewith et al., 2000, 2002) and now measures attitudes and
health beliefs. The HHQ is a self-completed questionnaire, 3.1. Participant flow
which produces a single score with higher scores indicating
a more positive attitude towards CAM. Between June 2001 and June 2002, 156 subjects were
referred and interviewed over the telephone to assess
2.6.2.5. The credibility rating (Borkovec and Nau, 1972). eligibility for inclusion in the study. Thirty-seven patients
This was completed prior to and after the first and last met the initial inclusion criteria and were randomised to
treatment of both placebo and real acupuncture groups in practitioner. The main reasons for non-inclusion were
order to gain an appreciation of relative credibility of the inability to attend for treatment (transport problems),
two interventions. impending operation, pain in multiple sites, unwilling to
be part of a trial, ongoing other treatment, e.g. physio-
2.7. Randomisation therapy. There was no drop-out once randomisation
occurred and no adverse reactions were noted. A chart of
A computer program RANDOMLOGUE produced by the patient flow through the trial is shown in Fig. 2.
University of Southampton, Department of Social Statistics,
was used to generate randomisation lists. Three lists were
generated, firstly for randomisation to practitioner and then 3.2. Baseline data
two separate lists (one for each practitioner) to randomise to
treatment group, with group A receiving real needles Groups were well balanced at baseline for all measured
followed by placebo needles and group B receiving placebo parameters (Table 2) and there were no statistical
needles followed by real needles. Patients were stratified by differences in the distribution of scores between groups on
gender and affected joint (knee or hip) to be treated. These the credibility rating at any of the time points measured
lists were typed onto individual cards by a typist not (Fishers exact test). There were four patients in each group
involved in the trial and were placed in individual sealed, who had previous experience of acupuncture. Table 3 shows
opaque envelopes by the typist for use in the study. At no the division of male and female patients as randomised to
point did the assessor view either the list or the cards prior to the two practitioners.

P. White et al. / Pain 106 (2003) 401–409 405

Table 3
Results of randomisation

Group A (n ¼ 18; Group B (n ¼ 19;
real needles/placebo placebo needles/real
needles) needles)

Male Female Male Female
patients patients patients patients

Male practitioner 5 5 2 7
Female practitioner 3 5 4 6
Total 8 10 6 13

A similar picture emerges for the radiating sensation as
shown in Fig. 3b, except that rather more subjects (61%)
score higher on the real needles than on the placebo needles
(31%). However, this difference is not signiﬁcant. Again,
there is evidence that the scores are generally lower for
those patients treated by the female practitioner. Stinging
Fig. 2. Consort diagram. sensations were highly variable for patients treated by either
practitioner with many patients scoring quite high values
3.3. Outcomes with both types of needles. Finally, electric sensations were
hardly evident at all with the female practitioner, but about
3.3.1. Needle sensation half the patients treated by the male practitioner recorded
The four needle sensation variables were assessed after relatively high scores for one or both needle types.
each treatment using a VAS with low values corresponding
to little sensation and high values corresponding to severe 3.3.2. Needle penetration
sensations. Fig. 3 shows a plot of the scores for the real Patients were asked to say whether they felt needle
needles and the placebo needles for each subject, with solid penetration during the treatment with real and placebo
and open circles corresponding to the female and male needles. Table 5 shows the responses to this question for the
practitioners, respectively. 37 patients.
It is evident that the scores for dull sensation are very Of the 37 patients, 25 (67.6%) felt the real needles had
variable, between and within subjects. Although 18 (50%) penetrated, but 22 (59.5%) felt that the placebo needles had
of the subjects felt a greater dull sensation with the real penetrated. Previous experience (prior to this trial) of
needles than with the placebo needles, 15 (42%) patients acupuncture did not appear to inﬂuence how this question
scored the needles the other way for this sensation. The most was answered (P ¼ 0:255; ANCOVA). Nearly half of the
noticeable feature of Fig. 3a is the relatively lower scores patients, 18 (48.6%) felt penetration with both needles,
achieved by the female practitioner with either type of while 7 (18.9%) felt no penetration with either type of
needle. Few of the subjects treated by the female needle. Seven patients correctly distinguished the real
practitioner scored more than 10 with either needle for needles from the placebo needles, but two felt penetration
this dull sensation. A comparison of the VAS scores using with the placebo needles but not with the real needles. Most
the sign test and Wilcoxon’s signed rank test is shown in patients, 25 (67.6%), were unable to discriminate between
Table 4. the needles by means of the sensation of needle penetration

Table 2
Comparison of baseline values

Group A (n ¼ 18; real needles/placebo needles) Group B (n ¼ 19; placebo needles/real needles)

Mean Median SD Range Mean Median SD Range

Pain scores 53.3 52.0 22.4 7.9–50.3 50.3 49.9 19.1 6.4–79.3
Analgesia 3.8 2.5 3.4 0–2.8 2.8 2.0 2.7 0–8
Age 65.8 67 8.3 51–64.4 64.4 66 12.7 37–79
HHQ 51.2 53 6.9 34–53.9 53.9 53 5.9 43–65
NHP 0.62 0.58 0.24 0.16–0.57 0.57 0.61 0.20 0.18–0.97

406 P. White et al. / Pain 106 (2003) 401–409

Fig. 3. (a and b) Plots of visual analogue scores for dull sensation and radiating sensation for real and placebo needles. (c and d) Plots of visual analogue scores
for stinging sensation and electric sensation for real and placebo needles.

of the skin. McNemar’s test gave a x2 -value of 2.78, which shown in Table 6. A large proportion of subjects were
is not significant ðP ¼ 0:095Þ: unable to detect a difference between the two types of
needles. Once again, previous experience of acupuncture
3.4. Similarity of treatments treatment did not have any significant effect on how subjects
responded to this question (P ¼ 0:292; ANCOVA). Four-
All but one of the patients (36) responded to the question teen subjects (39%) recorded that the needles felt different
concerning similarity of treatments. The responses are (probably different and definitely different). Of these, seven
were convinced that the needles were definitely different,
this was compared to 15 who felt they were definitely the
Table 4 same [there was no significant difference between groups,
Comparison of VAS scores for needle sensations for real and placebo
i.e. order of treatment (P ¼ 0:821; x2 )].
needles using the sign test and Wilcoxon’s signed rank test
More subjects treated by the female practitioner felt that
Sensations Number of subjects ðn ¼ 36Þ the two types of needles were similar to each other
compared to those treated by the male practitioner. A x2
Positive Negative P-value for P-value for
difference difference sign test Wilcoxon signed test comparing those who scored less than 50 with those
rank test who scored greater than 50 for the two practitioners gave
x2 ¼ 7:48; which is significant with a P-value of 0.003.
Dull 18 (50.0%) 15 (41.7%) 0.73 0.42
Radiating 22 (61.0%) 11 (30.6%) 0.08 0.27
Stinging 19 (52.8%) 14 (38.9%) 0.49 0.15 Table 6
Electric 15 (41.7%) 16 (44.4%) 1.00 0.54 Similarity of the two treatments by practitioner

Perceived similarity Male Female Number Percentage
Table 5 on VAS practitioner practitioner of patients
Responses of patients to penetration question for the two types of needles
Definitely the 2 13 15 41.7
Placebo needles Real needles same 0–25
Probably the 5 2 7 19.4
Yes No No response Total same 26–50
Probably different 5 2 7 19.4
Yes 18 2 2 22 (59.5%) 51 –75
No 7 7 – 14 (37.8%) Definitely different 6 1 7 19.4
No response – 1 – 1 76 –100
Total 25 (67.6%) 10 (27.0%) 2 37 Total 18 18 36 100

P. White et al. / Pain 106 (2003) 401–409 407

Table 7
Similarity of the two treatments by treatment sequence

Perceived similarity Group A Group B Number Percentage
on VAS of patients

Definitely the same 0–25 6 9 15 41.7
Probably the same 26–50 4 3 7 19.4
Probably different 51–75 4 3 7 19.4
Definitely different 76–100 3 4 7 19.4
Total 17 19 36 100

There is clear evidence that more patients considered that
the two needle types were similar with the female Fig. 5. Plot of mean weekly analgesia use for the real and placebo needles.
practitioner than with the male practitioner. Table 7 shows
the same data but for treatment sequence. Group A (real
needles followed by placebo) had three fewer patients who these means, but no clear difference between the two
felt that the treatments were quite similar than group B needles for either practitioner. The sign test and Wilcoxon
(placebo followed by real) but this difference was not
signed rank test indicate that there is no difference between
significant in the context of this trial, indicating that the
these two sets of scores ðP ¼ 0:5Þ: Similarly analgesia use is
order of treatment did not influence the assessment of
compared in Fig. 5 with the same conclusion. The amount of
similarity.
analgesia taken changed very little for patients treated by
An ordinal log-linear model analysis applied to the
either practitioner. The average difference between the
similarity codes, treated as an ordered categorical variable
scores for NHP was 2 0.1 (95% CI 2 0.05 to 0.02). This was
with values 1 –4, showed that practitioner was the primary
not significant using a paired t-test ðP ¼ 0:41Þ:
predictor of similarity. Treatment group, patient’s age and
HHQ at baseline were not significant, but there was some
evidence that the amount of analgesia taken at baseline had
a limited effect. Those patients taking the highest amount of 4. Discussion
analgesia tended to say that the treatments were dissimilar.
The prime aim of this trial was to provide independent
3.5. Improvements in pain, analgesia and NHP validation for the Streitberger placebo needle. The number
of subjects recruited, however, was very low and therefore
The assessments of pain, analgesia use and NHP were underpowered, which clearly impacts on the generalisability
also measured during each treatment period, with the results of the results of our study. The results as they are, however,
shown in Figs. 4 and 5. do suggest that sensations normally associated with real
Fig. 4 shows the within-patient mean VAS scores for the acupuncture are similarly felt with the placebo needle and
final week of treatment for both the real and placebo that the order in which these treatments were received does
needles. It is clear that there is quite a large variation in not appear to be a confounding factor. This is an important
point for the validity of the Streitberger needle in the context
of this trial as clearly it could be argued that patients
receiving placebo first would notice a sudden change when
the real needle (and therefore real penetration) was used.
Similarly, the absence of penetration would be noticed if
the real needle had been used first; this was however, not the
case in terms of the sensations and penetration noted at the
end of each treatment sequence. Indeed, only seven subjects
(19%) were able to correctly answer the questions relating
to skin penetration. This was partly in line with Streit-
berger’s findings (1998) who questioned his subjects on the
presence of ‘deqi’, pain on needling and whether they felt
penetration or not. He found that the majority had felt
penetration and similar pain from real and placebo needles.
He also found that more subjects had experienced deqi with
Fig. 4. Plot of mean visual analogue scores for pain for the real and placebo real acupuncture than with the placebo. Our credibility data
needles. also suggest that there was no difference in credibility

408 P. White et al. / Pain 106 (2003) 401–409

between the two interventions thus adding weight to the it might not be completely inactive. Therefore, if this
validity of the Streitberger needle. The question asking needle is to be used as a placebo in future efficacy studies,
‘How similar did you find this needle to the acupuncture more research should be undertaken to ensure that it is
needle that you had before?’ yielded some interesting indeed truly inert.
results; unfortunately there was no corresponding question We can be confident that pre-existing attitude to CAM
in the Streitberger trial. Clearly the largest single group was not a confounding factor in the context of this trial as
(15 subjects) felt that the two periods of treatment were the confirmed by others (Lewith et al., 2002; White, 2002).
same and a further seven subjects were reasonably Finally, we must stress that this trial used small numbers of
convinced that this was so. Fourteen subjects, however, patients from an elderly population, results must therefore
felt that there was some doubt and seven of these felt that the be used with caution.
treatments were not similar at all. This represents a sizeable
proportion of the sample tested in this trial. It must be
pointed out that asking if treatments are similar, is not the
5. Conclusion
same as asking if the subject believed the treatment was real
or even if it were the same treatment and in hindsight these
extra questions would have yielded important information. No major differences in outcome between real and
Our data does imply, however, that there is still some doubt placebo needling could be found as both groups performed
about this issue. equally well. No patient gender bias was encountered and
If a prerequisite of a placebo is that it is indistinguish- pre-existing attitudes to CAM had no effect on outcome.
able from the real treatment, then the fact that nearly 40% This was a very small sample, however, and results should
of subjects did not find that the two interventions were be interpreted with caution. We feel that the Streitberger
similar, however, raises some concerns with regard to the needle is a convincing control for the majority of people
wholesale adoption of this instrument as a standard although this may be heavily dependent on how the
acupuncture placebo procedure. Perhaps we should ask treatment (both verum and placebo) is delivered.
ourselves the question, if this were a drug trial, would we This needle may, however, represent the best current
be happy if 40% did not find the interventions to be similar, option for a convincing ‘acupuncture like’ control but
or if 19% were able to correctly distinguish between further work on ascertaining its true physiological effect,
treatments? This is a very important question to ask in inter-tester reliability and standardisation of technique is
terms of acupuncture research and debate on this issue highly recommended before we can be completely confident
would be welcomed. about using this needle as a placebo in further studies.
Although the trial by Streitberger (Streitberger and
Kleinhenz, 1998) used two practitioners, there was no
report on inter-tester reliability. Our trial also involved two References
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