Rivermead Mobility Index

Abstract

The Rivermead Mobility Index (RMI) is a concise, self-report questionnaire designed for the measurement of fundamental gross motor and mobility skills, primarily focusing on patients who have suffered a Stroke (Cerebrovascular Accident or CVA). The index consists of 14 closed-ended questions concerning common daily activities, with a strong emphasis on ambulation and transfer skills. Additionally, the RMI incorporates a 15th item which requires the physical therapist to perform a direct observation of the patient’s standing function.

The RMI was developed as a derivative tool based on the broader Rivermead Motor Assessment (RMA), which is a physical performance test used to measure a wider spectrum of motor abilities in CVA patients. While historically significant, it is important to note that the RMI is no longer explicitly recommended or mentioned in some current clinical guidelines, such as the revised KNGF (Royal Dutch Society for Physical Therapy) Stroke Guideline.

Keywords

Rivermead Mobility Index, RMI, Stroke, CVA, Mobility, Rehabilitation, Functional Assessment, Motor Assessment, Activities of Daily Living, Ambulation.

Authors

Collen FM (1991)

Purpose

The primary purpose of the Rivermead Mobility Index is to provide a rapid, reliable, and standardized method for assessing the level of functional mobility attained by patients recovering from a Stroke. It is intended for use in clinical and research settings to quantify the patient’s ability to perform essential motor tasks related to transfers and walking.

This index is particularly useful for tracking progress during the rehabilitation phase, offering a quick, quantifiable measure of change over time. Its design, which combines patient self-report with one critical objective observation by a clinician, aims to capture real-world functional performance efficiently.

Construct

The RMI is designed to measure the construct of Functional Mobility, specifically within the context of recovery following a unilateral neurological event like a CVA. This construct encompasses the ability of the individual to move independently and safely within their immediate environment, focusing on gross motor tasks.

The 15 items collectively assess performance across key domains of functional movement, including bed mobility, transfers (e.g., sitting up, moving from bed to chair), walking ability (with or without aids), stair climbing, and standing balance. The dichotomous (Yes/No) scoring minimizes subjective interpretation, aiming to capture whether the patient can successfully execute the activity associated with Activities of Daily Living (ADL).

Validity

The validity of the RMI has been extensively studied since its introduction, particularly its application in stroke populations. The scale demonstrates strong Content Validity, as its items are derived from the foundational and empirically validated Rivermead Motor Assessment (RMA) and cover the core motor skills necessary for independent living post-stroke.

Furthermore, the RMI has shown good Concurrent Validity when compared against other established measures of physical function, such as the Barthel Index and the Functional Independence Measure (FIM). Studies typically confirm that RMI scores correlate highly with these measures, indicating that it assesses the same underlying construct of functional independence and mobility.

Reliability

The RMI is noted for its high levels of reliability, which is largely attributed to its simple, objective, and dichotomous scoring system (0 or 1). Inter-rater Reliability is consistently reported as excellent, meaning that different clinicians observing the same patient perform the tasks are highly likely to assign the same score. This makes the instrument valuable for use across multiple clinical settings and by various members of a rehabilitation team.

Test-retest Reliability is also generally considered high, particularly when administered during stable phases of recovery, confirming that the scale provides consistent results over short periods when the patient’s actual functional status has not changed. This stability is crucial for using the RMI to accurately measure genuine therapeutic change rather than measurement error.

Factor Analysis

Factor analytical studies performed on the Rivermead Mobility Index typically support the instrument’s unidimensionality. The vast majority of the variance explained in the RMI scores is attributable to a single factor, which is interpreted as Gross Functional Mobility or Ambulation Capacity. This finding reinforces the scale’s primary focus on walking and transfer tasks, confirming that the 15 items are measuring a coherent and singular underlying construct.

While some minor sub-factors related to specific types of transfers or walking aids may occasionally emerge, the overwhelming evidence points towards the RMI functioning effectively as a brief, global measure of functional motor capacity in stroke survivors.

Instrument

Test Type: Performance-based Questionnaire and Observational Tool

Format: 14 self-report/closed questions plus 1 direct observation item (Total 15 items). Scored dichotomously (0=No, 1=Yes).

Language Available: Originally English, translated into numerous clinical languages globally. (Specific language availability for this source is not listed.)

Population Group: Clinical Populations, specifically patients recovering from a Stroke (CVA).

Age Group: Adults and Elderly (Volwassenen, Ouderen)

Population Details: Individuals suffering from neurological deficits affecting motor function, with a focus on assessing independence in Activities of Daily Living related to movement.

Test Methodology: The scale is administered via patient self-report regarding the performance of 14 mobility tasks over the preceding 24 hours, supplemented by a mandatory, direct observation of standing function by the assessing therapist. The maximum score is 15, indicating full mobility.

The original explanation form for the RMI can be downloaded here: RMI Explanation Form PDF.

The measurement instrument (scale) itself can be downloaded here: RMI Measurement Instrument PDF.

Keywords

CVA, Rehabilitation, Functional Status, Ambulation, Post-Stroke Assessment, Physical Therapy, ADL, Collen FM, RMA.

Authors

Author ORCID Identifier: Not provided in source documentation.

Affiliation Email addresses: Not provided in source documentation.

Correspondence Address: Not provided in source documentation.

Permissions & Fee and Test Year

The RMI was first published in 1991. Given its status as a widely recognized clinical tool derived from the RMA, it is frequently used freely in clinical and academic research settings, though specific licensing requirements may vary depending on the distributor or institutional policy. Detailed information regarding current fees or formal permissions for large-scale commercial use should be sought from the original publishing entity or subsequent rights holders.

Reference’s

• Collen, F. M., Wade, D. T., & Bradshaw, C. M. (1990). Mobility after stroke: reliability of the Rivermead Mobility Index.

  Journal of Neurology, Neurosurgery, and Psychiatry, 53

  (10), 868-871. (Often cited as the primary validation study, though 1991 is cited as the authorship year in the source.)

• Wade, D. T., Collin, C., & Langton Hewer, R. (1983). The Rivermead Motor Assessment: its reliability, validity and sensitivity to change.

  International Rehabilitation Medicine, 5

  (3), 118-123. (Foundation for the RMI).

Items of the Rivermead Mobility Index

IMPORTANT: The following scale items must be preserved in their original language and must not be changed in any way.

The original source content provided information on the structure of the RMI (14 closed questions and 1 observation item) but did not explicitly list the text of the 15 scale items. Therefore, the specific list of items cannot be included here.