Related Experiment Videos
Assessment of locomotor function in young boys with Duchenne muscular dystrophy
R A Smith1, R G Newcombe, J R Sibert
1Institute of Medical Genetics, University of Wales College of Medicine, Cardiff.
Insights
Assessing Duchenne muscular dystrophy (DMD) in young boys is crucial for treatment trials. The locomotor quotient from Griffiths' Scales effectively tracks functional decline in DMD, unlike other methods.
Area of Science:
- Pediatric Neurology
- Movement Disorders
- Clinical Trials
Background:
- Duchenne muscular dystrophy (DMD) is a progressive genetic disorder affecting motor function.
- Early and objective assessment of locomotor function is vital for evaluating therapeutic interventions in young children with DMD.
- Existing assessment methods may not be suitable for the early stages of DMD.
Purpose of the Study:
- To prospectively evaluate objective methods for assessing locomotor function in young boys with Duchenne muscular dystrophy.
- To identify a reliable assessment tool suitable for inclusion in clinical treatment trials for early-stage DMD.
Main Methods:
- Prospective study comparing 33 boys with DMD (mean age 3.42 years) and 21 healthy controls (mean age 3.51 years).
- Evaluated reproducibility of hand-held myometry.
- Assessed the Hammersmith Motor Ability Score.
- Utilized the locomotor quotient from the Griffiths' Scales for functional assessment.
Main Results:
- Hand-held myometry showed poor reproducibility and was not useful for assessment.
- The Hammersmith Motor Ability Score indicated age-related developmental increases, differing significantly from normal trajectories.
- The locomotor quotient of the Griffiths' Scales demonstrated a clear deterioration in scores over time, indicating functional decline.
Conclusions:
- The locomotor quotient derived from Griffiths' Scales is a useful and objective method for assessing locomotor function in young boys with DMD.
- This validated method can be employed in clinical trials to monitor disease progression and treatment efficacy in early-stage DMD.
- Further discussion addresses sample size planning for future treatment trials in this population.
Abstract:
Thirty-three young boys (mean age 3.42 years) with Duchenne muscular dystrophy (DMD) and 21 normal control boys (mean age 3.51 years) were studied prospectively to determine whether it is possible to objectively assess locomotor function in young boys with DMD so that they can be included in treatment trials. An initial reproducibility study using a hand-held myometer demonstrated that this method was not useful. The Hammersmith Motor Ability Score demonstrated an increase in developmental abilities with age which was markedly different from normal. The locomotor quotient of the Griffiths' Scales demonstrated a deterioration of quotient scores and is a useful method of assessment that could be used in treatment trials involving young boys with DMD. Sample size planning for treatment trials is discussed.