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Opioid side-effects 'outweigh benefits' in treating osteoarthritis

03 Nov 09

Two new gold standard reviews have controversially called into question GP prescribing of opioids for osteoarthritic pain.

Reviewers for the Cochrane Collaboration concluded opioids should not be routinely used in osteoarthritis, even in patients in ‘severe’ pain.

One of the reviews found the harmful side-effects of non-tramadol opioids outweighed their benefits, and that they should not be used routinely in knee and hip osteoarthritis.

The other - specifically on tramadol - found its efficacy was similar to paracetamol, but with more side-effects.

The first review, of 10 trials in 2,268 participants, found small improvements in pain and function for those treated with opioids compared with placebo.

It found little evidence that increasing dose, route of administration or duration of treatment improved pain relief and function.

Every twelfth patient treated with opioids had an additional adverse event compared with placebo, it reported.

Study leader Dr Eveline Nuesch, a research fellow in epidemiology at the University of Bern, Switzerland, said: ‘The small to moderate beneficial effects of non-tramadol opioids are outweighed by large increases in adverse events.’

The second review - of 11 trials in 1,019 patients – concluded: ‘Benefits of tramadol are comparable with paracetamol’s, coupled with a less favourable safety profile.’

Dr John Dickson, a former GP and community specialist in rheumatology for Redcar and Cleveland PCT, was clinical adviser to NICE for its osteoarthritis guidelines. He said: ‘There are few trials to show opioids are any good in osteoarthritis and I don’t use them much. But people tell us not to use NSAIDs and for GPs there is very little to offer these patients.’

He said use of opioids remained an option under NICE guidance, with alternatives being referral for a new knee or hip, or an NSAID.

Professor Philip Conaghan, professor of musculoskeletal medicine at the University of Leeds, criticised the quality of the trials analysed in the Cochrane reviews, and said the conclusions did not support a call to avoid opioids.

‘These are strong recommendations to make on the basis of combining findings from poor-quality trials of different opioids, at different doses that are not comparable,' he said.

‘All the evidence-based guidelines on osteoarthritis, from NICE to EULAR to the American College of Rheumatology, support use of opioids.'

‘Many of our patients with osteoarthritis do not get adequate pain relief from the core NICE approach of weight loss, education, exercise, paracetamol and topical NSAIDs, so to say opioids do not have a place is unbelievable.’

Osteoarthritis and opioids: what NICE says

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Opioids are regarded as an option after lifestyle measures, and treatment with paracetamol and/or topical NSAIDs.

‘If paracetamol or topical NSAIDs are insufficient for pain relief…then the addition of opioid analgesics should be considered. Risks and benefits should be considered, particularly in elderly people.’

Source: NICE clinical guidelines 59

Readers' comments

  • Matt Bennett | 03 Nov 09

    Many patients benefit from a home based exercise routine backed up by periodic visits to a physio or chiropractor for mobilisation/ manipulation. These resources are often under utilised in the management of OA. Chiropractor, Brighton, private practice

  • Ronald Graves | 03 Nov 09

    I have widespread o-a, mainly as a result of joint damage caused by being struck by lightning in '83 (though I'd developed o-a in my left hip 8 years earlier). I find opioid analgesics (DHC) very effective in muting my often severe pain - the side effects I can live with. All my meds cause side-effects to a degree, but so what? As always, medication is a trade-off between benefits and problems, and for me, at least, the benefits of DHC far outweigh any problems (the worst of which is constipation, which is manageable). I'm with Prof. Conaghan on this (I'm sure he'll be relieved!).

  • ANDREW GRAY | 03 Nov 09

    Of course the fat should be thin, and of course they should take more exercise, but patients tell us that Co-dydramol, Co-codamol (and Co-proxamol) are better than Paracetamol alone. The 'be thin and suffer' message is not sustainable.

  • Louisa Shillito | 04 Nov 09

    Surely the adverse effects of oral NSAIDs, which would be pretty much the only alternative when paracetamol didn't work, would be far greater?

  • peter passmore - belfast | 09 Nov 09

    This is an interesting review. The conclusion is somewhat severe for patients with pain due to osteoarthritis. The issue in the clinic is of the individual rather than the 'average' that results from these analyses. Every prescription, particularly for older people, is a balance of the benefits versus the risks of adverse events. In older people nonpharmacological recommendations are important but in practice pharmacological adjuvant therapy is often needed for adequate analgesia and to maintain quality of life. For many older people with osteoarthritis, it is not so much the placebo that is the useful comparison, rather the paracetamol and oral nonsteroidal anti-inflammatory drugs. The last Cochrane review (Towheed 2006) on this subject found that oral NSAID's were marginally more effective than paracetamol without increased safety concerns in the studies of short duration which were highly selective. That review goes on to point out 'This conclusion may not be generalizable to the clinical setting where a heterogeneous patient population (some of whom who may have significant baseline risk factors for NSAID toxicity) is being managed. Risk factors for upper GI bleeding in patients treated with NSAIDs include age > = 65 years, history of peptic ulcer disease or of upper GI bleeding, concomitant use of oral glucocorticoids or anticoagulants, presence of comorbid conditions (Gabriel 1991, Lanza 1998). Risk factors for NSAID-induced reversible renal failure in patients with intrinsic renal disease include age > = 65 years, hypertension and/or congestive heart failure, and concomitant use of diuretics and angiotensin-converting enzyme inhibitors'. These comments allied to the cardiovascular concerns for NSAID's in this age group do mean that consideration of opioid medication is often necessary and when carefully evaluated this option is needed to provide meaningful pain relief, as suggested in the international and NICE guidelines.


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