Posture and Postural Ability Scale
Original Editor - Lauren Heydenrych
Objective[edit | edit source]
The Posture and Postural Ability Scale (PPAS) is an assessment tool that allows for posture and postural ability to be assessed independently.It is specifically designed to assess both the qualitative and quantitative aspects of posture.
'Quality' of posture is addressed by observing the shape of the body, considering the alignment of specific structures relative to adjoining structures and the support surface.
'Quantity' of posture is related to the ability to stabilize in relation to adjoining structures and the support surface, looking specifically at the ability to hold the centre of gravity within the base of support. 
Intended Population[edit | edit source]
The PPAS is intended for individuals with severe physical disabilities. This tool is not age or diagnosis-specific.
Method of Use[edit | edit source]
Materials needed[edit | edit source]
- Copy of the PPAS scoring sheet.
- Pen/ pencil
Time required[edit | edit source]
When performed by experienced therapists, the PPAS can take less than 10 minutes.
Equipment needed[edit | edit source]
- Plinth/ table for supine and prone lying, as well as for sitting, where feet need to rest on a support surface.
- Firm support surface for standing.
Scoring[edit | edit source]
The PPAS assesses 4 positions:
Each position is assessed according to:
- Postural Ability
- Quality of Posture
Within Postural Ability seven levels are designated, ranging from Level 1 = 'Unplaceable in an aligned posture' to 7 = 'Able to move into and out of position.'
Quality of Posture comprises of six items, each looking at a specific body region. These items are observed in the frontal view and then in the sagittal view. Scoring of the Quality of Posture is given either as a 1 or 0. The value 1 = postural symmetry and alignment, while 0 = asymmetry and deviation from the midline. The total score is calculated separately for each position in the frontal plane and the sagittal plane. Within the assessment of the quality of posture, a space for comments is also made available.
Evidence[edit | edit source]
Reliability[edit | edit source]
When tested on an adult cerebral palsy (CP) population, interrater reliability was scored as excellent (three independent raters were used). In addition, there was a high internal consistency for all items scored.These results were reproduced in a study performed with children diagnosed with cerebral palsy.
When tested with children (aged between 6 and 16 years) diagnosed with cerebral palsy, no difference in scoring was related to the children's ages.
Validity[edit | edit source]
Construct validity was also demonstrated when using the Gross Motor Function Classification System (GMFCS). Lower scores on the PPAS were correlated with higher levels of the GMFCS. It must be noted that the PPAS was not able to identify differences in postural abilities in individuals between the levels I and II.
Relevance[edit | edit source]
The PPAS is a tool that aids in equipment prescription, providing insight into where support is needed.
Furthermore, the PPAS is a tool that can be used in active surveillance of posture and developing deformities. Thus providing a way for early identification and management of asymmetries and deficits which would otherwise lead to contractures and boney or joint deformities.
Links[edit | edit source]
- SeekFreeks is a website specifically for therapists. On their page relating to adaptive equipment selection and implementation are additional resources around the PPAS and other tools.
- A comprehensive guide to the use of the PPAS (in PowerPoint) can be found here.
References[edit | edit source]
- Rodby-Bousquet E, Ágústsson A, Jónsdóttir G, Czuba T, Johansson AC, Hägglund G. Interrater reliability and construct validity of the Posture and Postural Ability Scale in adults with cerebral palsy in supine, prone, sitting and standing positions. Clinical rehabilitation. 2014 Jan;28(1):82-90.
- Rodby-Bousquet E, Persson-Bunke M, Czuba T. Psychometric evaluation of the Posture and Postural Ability Scale for children with cerebral palsy. Clinical rehabilitation. 2016 Jul;30(7):697-704.