Outcome measures and motion capture systems for assessing lower limb orthosis-based interventions after stroke: a systematic review

Development of a candidate item bank for measuring mobility of lower limb orthosis users

BACKGROUND

Orthoses are often prescribed to improve mobility of people with chronic health conditions that affect lower limb function. Patient-reported survey instruments can be used to measure aspects of mobility that cannot be easily assessed in clinical or research settings. A population-specific item bank could be designed to measure aspects of mobility that are most important to lower limb orthosis users and used to evaluate the effects of orthoses.

OBJECTIVE

To develop items for a new survey instrument to measure mobility of lower limb orthosis users.

DESIGN

Survey items were developed using a qualitative item review process.

SETTING

Focus groups were held by video conferencing. Cognitive interviews were conducted by telephone.

PARTICIPANTS

Focus group and cognitive interview participants were adults with at least 6 months of experience using a lower limb orthosis that extended from the foot to a level above the ankle.

METHODS

Research methods included focus groups with lower limb orthosis users, an item generation and reduction process that involved a stakeholder advisory panel, and cognitive interviews with target respondents.

RESULTS

A total of 1180 extant items were identified in a literature review. Focus group participants (n = 29) provided feedback that informed the suitability of a construct definition and conceptual model. An advisory panel contributed to the selection of 118 candidate items for measuring orthotic mobility. Feedback from cognitive interview participants (n = 30) informed removal or revision of problematic items, resulting in a candidate bank of 100 mobility items.

CONCLUSIONS

The rigorous qualitative methods applied here resulted in a large set of candidate items that spanned a range of situations relevant to moving with a lower limb orthosis. Next steps include administration of the candidate items to a large sample of lower limb orthosis users and calibration of the item bank.

Reliability and validity of the Turkish version of the satisfaction module of the Orthotics and Prosthetics Users' Survey

BACKGROUND

Evaluation of prosthesis and orthosis (P&O) devices and service satisfaction in patients using P&O are important to understand the patient perspective and improve the quality of devices and the services.

OBJECTIVE

The aim of this study was to translate the original Orthotics and Prosthetics Users' Survey (OPUS) satisfaction module into Turkish and examine its psychometric properties in lower limb P&O users.

STUDY DESIGN

Cross-sectional study.

METHODS

The Turkish versions of the OPUS-Client Satisfaction with Device (CSD) and Service (CSS) modules were applied to 157 individuals using a lower limb prosthesis or orthosis. The retest of the survey was applied 5-7 days later. Intraclass correlation coefficient was used to determine test-retest reliability, and Cronbach alpha was used to determine internal consistency. Criterion validity was evaluated using the Nottingham Health Profile. Exploratory factor analysis was used to examine the factor structure of the Turkish version of the OPUS satisfaction module.

RESULTS

The test-retest correlation (intraclass correlation coefficient = 0.92 for CSD and 0.91 for CSS) and internal consistency (Cronbach's alpha = 0.84 for CSD and 0.95 for CSS) were high. A statistically significant correlation was found between the OPUS CSD and CSS modules and the Nottingham Health Profile (r = -0.325 for CSD module, r = -0.381 for CSS module, P < 0.001). The factor analysis revealed one-factor structure for both modules.

CONCLUSIONS

This study demonstrated the reliability and validity of the Turkish version of the OPUS satisfaction module, and it provides a useful starting point for future studies on this survey.

Pelvis-Toe Distance: 3-Dimensional Gait Characteristics of Functional Limb Shortening in Hemiparetic Stroke

We aimed to investigate whether a newly defined distance in the lower limb can capture the characteristics of hemiplegic gait compared to healthy controls. Three-dimensional gait analyses were performed on 42 patients with chronic stroke and 10 age-matched controls. Pelvis-toe distance (PTD) was calculated as the absolute distance between an anterior superior iliac spine marker and a toe marker during gait normalized by PTD in the bipedal stance. The shortening peak during the swing phase was then quantified as PTDmin. The sagittal clearance angle, the frontal compensatory angle, gait speed, and the observational gait scale were also collected. PTDmin in the stroke group showed less shortening on the affected side and excessive shortening on the non-affected side compared to controls. PTDmin on the affected side correlated negatively with the sagittal clearance peak angle and positively with the frontal compensatory peak angle in the stroke group. PTDmin in stroke patients showed moderate to high correlations with gait speed and observational gait scale. PTDmin adequately reflected gait quality without being affected by apparent improvements due to frontal compensatory patterns. Our results showed that various impairments and compensations were included in the inability to shorten PTD, which can provide new perspectives on gait rehabilitation in stroke patients.

Clinical outcome measures to evaluate the effects of orthotic management post-stroke: a systematic review

PURPOSE

To identify, and classify, according to International Classification of Functioning, Disability and Health (ICF), clinically applicable outcome measures that have been used to evaluate lower limb orthotic management post-stroke and to investigate which outcome measures recorded the largest effect sizes.

MATERIALS AND METHODS

Electronic searches were performed in Pubmed, Cochrane, Web of Science, Cinahl, Scopus and Embase databases from inception to May 2020. Articles were included if they investigated clinical outcomes in people post-stroke who had received a lower-limb orthotic intervention.

RESULTS

88 articles underwent full-text review and 54 were included in the review, which was performed in accordance with the Preferred Reporting Items for Systematic Review (PRISMA) principles. 48 different outcome measures were identified; effect sizes were able to be calculated from 39 studies. The most frequently applied outcome measures were the 10-metre Walk Test and the timed-up-and-go test. Outcome measures that recorded large effect sizes in two or more studies were the 10-metre Walk Test, Functional Reach Test, and Physiological Cost Index. When coded according to the ICF, the most frequently represented codes were d450 (Walking) and d455 (moving around).

CONCLUSIONS

Results suggest that outcome measures related to mobility (ICF chapter d4) are most often applied to evaluate orthotic management post-stroke. Effect sizes appear to be greatest in outcome measures related to velocity, balance, and energy expenditure.IMPLICATIONS FOR REHABILITATIONThe 10-meter Walk Test appears to have the greatest effect size when evaluating orthotic management post-stroke.While outcome measures related to mobility are commonly applied when evaluating orthotic management post-stroke, rehabilitation professionals should consider complementing these with measures representing the participation domain of the ICF.