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The comprehensive cohort model in a pilot trial in orthopaedic trauma

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Kearney, Rebecca S., Achten, Juul, Parsons, Nicholas R. and Costa, Matthew L.. (2011) The comprehensive cohort model in a pilot trial in orthopaedic trauma. BMC Medical Research Methodology, Vol.11 (No.39). ISSN 1471-2288

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Official URL: http://dx.doi.org/10.1186/1471-2288-11-39

Abstract

Background: The primary aim of this study was to provide an estimate of effect size for the functional outcome of operative versus non-operative treatment for patients with an acute rupture of the Achilles tendon using accelerated rehabilitation for both groups of patients. The secondary aim was to assess the use of a comprehensive cohort research design (i.e. a parallel patient-preference group alongside a randomised group) in improving the accuracy of this estimate within an orthopaedic trauma setting. Methods: Pragmatic randomised controlled trial and comprehensive cohort study within a level 1 trauma centre. Twenty randomised participants (10 operative and 10 non-operative) and 29 preference participants (3 operative and 26 non-operative). The ge range was 22-72 years and 37 of the 52 patients were men. All participants had an acute rupture of their Achilles tendon and no other injuries. All of the patients in the operative group had a simple end-to-end repair of the tendon with no augmentation. Both groups then followed the same eight-week immediate weight-bearing rehabilitation programme using an off-the-shelf orthotic. The disability rating index (DRI; primary outcome), EQ-5D, Achilles Total Rupture Score and complications were assessed ed at two weeks, six weeks, three months, six months and nine months after initial injury. Results: At nine months, there was no significant difference in DRI between patients randomised to operative or non-operative management. There was no difference in DRI between the randomised group and the parallel patient preference group. The use of a comprehensive cohort of patients did not provide useful additional information as to the treatment effect size because the majority of patients chose non-operative management. Conclusions: Recruitment to clinical trials that compare operative and non-operative interventions is notoriously difficult; especially within the trauma setting. Including a parallel patient preference group to create a comprehensive cohort of patients has been suggested as a way of increasing the power of such trials. In our study, the comprehensive cohort model doubled the number of patients involved in the study. However, a strong preference for non-operative treatment meant that the increased number of patients did not significantly increase the ability of the trial to detect a difference between the two interventions.

Item Type: Journal Article
Subjects: R Medicine > R Medicine (General)
R Medicine > RD Surgery
Divisions: Faculty of Medicine > Warwick Medical School > Health Sciences
Faculty of Medicine > Warwick Medical School
Library of Congress Subject Headings (LCSH): Achilles tendon -- Wounds and injuries -- Treatment, Clinical trials -- Methodology
Journal or Publication Title: BMC Medical Research Methodology
Publisher: BioMed Central Ltd.
ISSN: 1471-2288
Date: 5 April 2011
Volume: Vol.11
Number: No.39
Identification Number: 10.1186/1471-2288-11-39
Status: Peer Reviewed
Publication Status: Published
Access rights to Published version: Open Access
Funder: British Orthopaedic Association. Joint Action, Rosetrees Trust
References: 1. Campbell M, et al: Framework for design and evaluation of complex interventions to improve health. BMJ 2000, 321(7262):694-6. 2. Craig P, et al: Developing and evaluating complex interventions: the new Medical Research Council guidance. BMJ 2008, 337:a1655. 3. Kerry S, et al: Routine referral for radiography of patients presenting with low back pain: is patients’ outcome influenced by GPs’ referral for plain radiography? Health Technol Assess 2000, 4(20):1-119, i-iv. 4. Leppilahti J, Orava S: Total Achilles tendon rupture. A review. Sports Med 1998, 25(2):79-100. 5. Maffulli N: Rupture of the Achilles tendon. J Bone Joint Surg Am 1999, 81(7):1019-36. 6. Khan RJ, et al: Treatment of acute achilles tendon ruptures. A metaanalysis of randomized, controlled trials.[see comment]. Journal of Bone & Joint Surgery - American Volume 2005, 87(10):2202-10. 7. Costa ML, et al: Randomised controlled trials of immediate weightbearing mobilisation for rupture of the tendo Achillis. J Bone Joint Surg Br 2006, 88(1):69-77. 8. Cetti R, et al: Operative versus non-operative treatment of Achilles tendon rupture. Am J Sports Med 1993, 21(6):p791-9. 9. Moller M, et al: Acute rupture of tendo Achillis. J Bone Joint Surg 2001, 83- B(6):843-8. 10. Nilsson-Helander K, et al: Acute achilles tendon rupture: a randomized, controlled study comparing surgical and nonsurgical treatments using validated outcome measures. Am J Sports Med 2010, 38(11):2186-93. 11. Salen BA, et al: The Disability Rating Index: an instrument for the assessment of disability in clinical settings. Journal of Clinical Epidemiology 1994, 47(12):1423-35. 12. Brooks R: EuroQol: the current state of play. Health Policy 1996, 37(1):53-72. 13. Nilsson-Helander K, et al: The Achilles tendon Total Rupture Score (ATRS): development and validation. American Journal of Sports Medicine 2007, 35(3):421-6. 14. Grant AM, et al: Minimal access surgery compared with medical management for chronic gastro-oesophageal reflux disease: UK collaborative randomised trial. BMJ 2008, 337:a2664. 15. Freiman JA, et al: The importance of beta, the type II error and sample size in the design and interpretation of the randomized control trial. Survey of 71 “negative” trials. N Engl J Med 1978, 299(13):690-4.
URI: http://wrap.warwick.ac.uk/id/eprint/34604

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