Treatments for people with sickle cell disease in whom poor blood supply to an area of bone leads to bone death

Review question
We reviewed the effects of treatments for avascular necrosis of bone in people with sickle cell disease.

Background
Many people with sickle cell disease experience bone death due to temporary or permanent loss of blood supply to parts of their bones. This can be very painful. The bones usually affected are the thigh bones at the hip joint and the arm bones at the shoulder joint. The aim of treatment is to stop the pain and maintain a mobile joint. Treatments include resting the joint, physiotherapy, the use of pain relief, joint replacements and bone grafts. However, complications from surgery may be more frequent in people with sickle cell disease. This is an update of a previously published Cochrane Review.

Search date
The evidence is current to: 27 May 2016.

Study characteristics
We found one eligible trial, published in 2006, which analysed data from 38 people from 32 different treatment centres from the United States of America. The trial compared a treatment of surgery and physical therapy with physical therapy on its own. This trial did not show that the addition of surgery to a physical therapy regimen could improve the outcome for people with sickle cell disease and avascular necrosis.

Key results

After a mean follow up of three years, the combination of surgery and physical therapies did not show clinical improvement when compared with physical therapy alone. Given that the results are imprecise, we are uncertain as to whether surgery and physical therapies in combination has an important effect on hip pain, vaso-occlusive crises and acute chest syndrome. Trial authors did not report information on mortality and quality of life.

Quality of the evidence
The limited number of participants included in the study led to imprecise results, therefore the confidence in the results is very low.

Authors' conclusions: 

We found no evidence that adding hip core decompression to physical therapy achieves clinical improvement in people with sickle cell disease with avascular necrosis of bone compared to physical therapy alone. However, we highlight that our conclusion is based on one trial with high attrition rates. Further randomized controlled trials are necessary to evaluate the role of hip-core depression for this clinical condition. Endpoints should focus on participants' subjective experience (e.g. quality of life and pain) as well as more objective 'time-to-event' measures (e.g. mortality, survival, hip longevity). The availability of participants to allow adequate trial power will be a key consideration for endpoint choice.

Read the full abstract...
Background: 

Avascular necrosis of bone is a frequent and severe complication of sickle cell disease and its treatment is not standardised. This is an update of a previously published Cochrane Review.

Objectives: 

To determine the impact of any surgical procedure compared with other surgical interventions or non-surgical procedures, on avascular necrosis of bone in people with sickle cell disease in terms of efficacy and safety.

Search strategy: 

We searched the Cochrane Cystic Fibrosis and Genetic Disorders Group Haemoglobinopathies Trials Register, comprising references identified from comprehensive electronic database searches and handsearches of relevant journals and abstract books of conference proceedings. Additional trials were sought from the reference lists of papers identified by the search strategy.

Date of the most recent search of the Group's Haemoglobinopathies Trials Register: 27 May 2016.

Selection criteria: 

Randomized clinical trials comparing specific therapies for avascular necrosis of bone in people with sickle cell disease.

Data collection and analysis: 

Each author independently extracted data and assessed trial quality. Since only one trial was identified, meta-analysis was not possible.

Main results: 

One trial (46 participants) was eligible for inclusion. After randomization eight participants were withdrawn, mainly because they declined to participate in the trial. Data were analysed for 38 participants at the end of the trial. After a mean follow up of three years, hip core decompression and physical therapy did not show clinical improvement when compared with physical therapy alone using the score from the original trial (an improvement of 18.1 points for those treated with intervention therapy versus an improvement of 15.7 points with control therapy). There was no significant statistical difference between groups regarding major complications (hip pain, risk ratio 0.95 (95% confidence interval 0.56 to 1.60; vaso-occlusive crises, risk ratio 1.14 (95% confidence interval 0.72 to 1.80; very low quality of evidence); and acute chest syndrome, risk ratio 1.06 (95% confidence interval 0.44 to 2.56; very low quality of evidence)). This trial did not report results on mortality or quality of life.

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