total hip replacement and musculoskeletal disorder research tosan okoro nworth seminar may 2012

‘Total Hip Replacement and Musculoskeletal disorder research’

Tosan OkoroNWORTH Seminar

May 2012

Outline

• WCAT Trainee Trauma and Orthopaedics

• PhD commenced August 2009

• Work supported by BCUHB Small Grants Scheme

The Evidence

• THR Indications 1

– Pain– Loss of mobility i.e. function

• Functional limitations that persist after THR 2

– Reduced muscle strength and postural stability– Reduced walking speed– Reduced stair climbing ability

1 Trudelle-Jackson E et al. Arch Phys Med Rehabil 2004. 85;1056-10622 Brander VA et al. Clin Orthop 1997;Dec(345):67-78.

The Evidence

Western Ontario and McMaster Universities Osteoarthritis Index (WOMAC) physical function score over time after total joint replacement between low and high baseline function groupsFortin et al. Arthritis Rheum 2002; 46 (12): 3327-3330

The Evidence

• Effects of poor function

– At 2 years after THR patients with low function 5x more likely to require assistance for activities of daily living (ADLs) than patients with high function 1

1. Fortin et al. Arthritis Rheum 2002; 46 (12): 3327-3330

Aims of study

To assess early home-based progressive resistance training (PRT) after total hip replacement (THR)

?improves muscle strength and patient function

vs. ‘routine’ physiotherapy

But what is routine physiotherapy after ‘THR’

• Ethics committee approval• Focus Group

– 4 physiotherapists; minimum 5 years experience– Pre-, Post-operative and continuing rehabilitation

themes discussed• Questionnaire development• Online survey of physiotherapists in the UK

– CSP– National Joint Registry

European College of Sports Science (ECSS) Annual Congress, Liverpool, July 2011

‘Routine’ Physiotherapy• Progressive resistance training

– 73% aware of it prescribed by only 32%

• 74% of respondents did not refer patients for further treatment on discharge

• Resubmitted to ‘Physiotherapy’ April 2012

European College of Sports Science (ECSS) Annual Congress, Liverpool, July 2011

Aims of study

To assess early home-based progressive resistance training (PRT) after total hip replacement (THR)

?improves muscle strength and patient function

vs. ‘routine’ physiotherapy

Design

• Prospective single blinded RCT.Ethical approval Jan 2010

• Stratification with age + gender

• Pilot Study

• NWORTH input

1 outcomes

• Maximal voluntary contraction of quadriceps muscle

• Objective measures of physical function– Timed up and go – 6 minute walk– Gait speed– Stair climbing performance– Sit to stand score

Objective measures

6 minute walk test (6MWT)

Gait speed (GS)

Timed up and go (TUG)

Sit to stand (ST)

Stair Climb performance(SCP)

Sample size (n=10 per group)

• Maximal voluntary force in quadriceps muscle

• 10% improvement with exercise relative to controls

• 80% power; alpha 0.05

• n=50 patients to recruit

Collaborations

Prof Clare Stewart, MMU, ManchesterMuscle Physiology

Recruitment

So far…

? Influence Function and Perceived Control in Patients awaiting Total Hip Replacement Surgery

Living Situation

Gender

Surgical Experience

European Health Psychology Society Annual congress, Crete, 2011

PreoperativeFunction

RLOCTPB PBC

Living alone > With PartnerTPB PBC (p=0.085)RLOC INT (p=0.073)

WOMAC PF (p=0.059)

Gender

Females > MalesRLOC INT (p=0.075)

History of previous surgery

No effect

European Health Psychology Society Annual congress, Crete, 2011

So what?

• ? Change locus of control to influence post-operative outcome

• Assess influence of control cognitions on function post-operatively

So far…

6 minute walk test (6MWT)

Gait speed (GS)

Timed up and go (TUG)

Sit to stand (ST)

Stair Climb performance(SCP)

British Hip Society 2012

KEY:TUG(s) Timed up and Go in secondsST Number of sit to stand performed from a chair in 30 seconds6MWT (m) 6 minute walk test in metresSCP(s) Stair climb performance in secondsGS (m/s) Gait speed in metres/second

British Hip Society 2012

KEY:* P<0.05TUG(s) Timed up and Go in secondsST Number of sit to stand performed from a chair in 30 seconds6MWT (m) 6 minute walk test in metresSCP(s) Stair climb performance in secondsGS (m/s) Gait speed in metres/second

KEY:rWOMAC PF Reduced Western Ontario and McMasters University Osteoarthritis personal function scale* P<0.05TUG(s) Timed up and Go in secondsST Number of sit to stand performed from a chair in 30 seconds6MWT (m) 6 minute walk test in metresSCP(s) Stair climb performance in secondsGS (m/s) Gait speed in metres/second

So what?

• rWOMAC PF better than OHS as a measure of ADLs and objectively measured physical disability

• Use of OHS as measure of impairment not appropriate

So far…

• Mental Health- Distress and Risk Assessment Method (DRAM)

Main CJ, Wood PL, Hollis S, Spanswick CC, Waddell G. The Distress and Risk Assessment Method. A simple patient classification to identify distress and evaluate the risk of poor outcome. Spine (Phila Pa 1976) 1992 Jan;17(1):42-52.

British Hip Society 2012

* p<0.05

Effect of DRAM on Oxford Hip Score

Effect of DRAM on reduced WOMAC function scale (rWOMAC PF)

CONSORT FLOWCHART

Data analysis inprogress

AcknowledgementsSupervisorsA Lemmey

P MaddisonJ G Andrew

Musculoskeletal Research GroupOrthopaedic Department

CollaboratorsPhysiotherapists

• Thank you