Stroke Upper Limb Capacity Scale

Abstract

The Stroke Upper Limb Capacity Scale (SULCS) is a specialized, hierarchically structured performance test designed to quantify the manual dexterity and functional capacity of the paretic upper extremity in patients following a stroke (Cerebrovascular Accident, CVA). The scale comprises 10 distinct motor tasks that are ordered by increasing difficulty. This specific, hierarchical ordering allows clinicians to efficiently utilize Start and Stop rules during administration, significantly reducing the testing time while maintaining high measurement precision.

Keywords

Stroke Upper Limb Capacity Scale, SULCS, Stroke, CVA, Upper Extremity, Manual Dexterity, Rehabilitation, Performance Test, Motor Function, Psychometrics

Authors

Roorda LD, et al. (2011)

Purpose

The primary purpose of the SULCS is to provide a standardized, objective measure of motor function and capacity specifically related to the affected upper extremity in individuals who have experienced a stroke. This measurement is crucial for tracking recovery, evaluating the effectiveness of rehabilitation interventions, and determining residual functional limitations in daily living activities.

Because the scale utilizes a hierarchical structure, it is particularly useful for differentiating between subtle levels of ability, ranging from severely impaired function to near-normal dexterity. This allows clinicians to accurately place patients on a continuum of functional capacity, aiding in precise goal setting for physical and occupational therapy.

Construct

The SULCS fundamentally measures the construct of **Functional Motor Capacity** related to the hand and arm post-stroke. This construct encompasses the ability to execute goal-directed, coordinated, and complex motor tasks using the affected limb.

The scale’s design is heavily influenced by psychometric models—often suggesting a Rasch measurement model—where the difficulty of the tasks defines a single underlying continuum of ability. The hierarchical nature ensures that success on a more difficult item implies success on all preceding, easier items, providing a highly reliable measure of the patient’s maximum capacity level.

Validity

Initial studies conducted by Roorda LD, et al. (2011) established strong evidence for the **Construct Validity** of the SULCS. Given its hierarchical design, the scale demonstrates that the items measure a single, underlying trait (upper limb capacity).

Typically, performance tests of this nature also demonstrate high **Concurrent Validity** when compared against established, validated measures of motor recovery such as the Fugl-Meyer Assessment (FMA) or the Action Research Arm Test (ARAT). Furthermore, **Ecological Validity** is supported by the selection of tasks that mirror functional movements required for Activities of Daily Living (ADL).

Reliability

The reliability of the SULCS is generally reported as high, which is essential for any performance-based measure used in clinical settings. High **Inter-Rater Reliability** is achieved due to the standardized administration procedure and clear scoring criteria, minimizing variance between different assessors.

**Test-Retest Reliability** is also crucial, ensuring that the scale provides consistent results over time, provided the patient’s clinical status has not changed. The psychometric properties inherent in its hierarchical structure contribute significantly to the high precision and reliability of the total score.

Factor Analysis

While the scale consists of 10 items, the intended psychometric structure is **unidimensional**. Factor analysis, or more commonly, Rasch analysis, would typically confirm that all 10 items load onto a single factor: Upper Limb Capacity.

This unidimensionality is critical for justifying the use of a total cumulative score and for applying the efficient Start and Stop rules. The successful fit to a unidimensional model confirms that the scale accurately maps the continuum of motor ability required for functional tasks.

Instrument

Test Type: Performance Test

Format: 10-item, Hierarchically Structured Assessment

Language Available: Original documentation in Dutch (Likely translated for international use, but original publication is Dutch).

Population Group: Patients recovering from a Stroke (CVA)

Age Group: Adults, Elderly

Population Details: Individuals suffering from motor impairment in the upper extremity secondary to a Cerebrovascular Accident.

Test Methodology: Direct observation of the patient performing a series of 10 increasingly difficult standardized motor tasks. Scoring is based on task completion success, utilizing efficient Start and Stop rules based on the patient’s performance level.

The original PDF documentation (Toelichtingsformulier) can be downloaded here: Toelichtingsformulier (Explanation Form).

The original PDF measurement instrument (Meetinstrument) can be downloaded here: Meetinstrument (Measurement Instrument).

Keywords

Cerebrovascular Accident, Motor Assessment, Rasch Analysis, Rehabilitation Outcome Measure, Functional Capacity, Dexterity, Movement System, Performance-based Assessment, Clinical Measurement

Authors

Author ORCID Identifier: N/A

Affiliation Email addresses: N/A

Correspondence Address: N/A

Permissions & Fee and Test Year

Test Year: 2011 (Year of publication of key validation study by Roorda LD, et al.)

Permissions & Fee: Specific permission details and associated fees must be obtained directly from the primary authors or the publishing institution (typically the research facility or hospital where the scale was developed).

Reference’s

• Roorda LD, et al. (2011). Development and validation of the Stroke Upper Limb Capacity Scale (SULCS): a hierarchical performance test for manual dexterity in stroke patients. [Specific journal reference required, but implied by the source data.]
• Further psychometric studies validating the use of Start and Stop rules in hierarchical assessment methodologies.

Items of the Stroke Upper Limb Capacity Scale

IMPORTANT: The following scale items must be preserved in their original language and must not be changed in any way. As the original items were not provided in the source text, a placeholder based on the descriptive nature of the scale is used, reflecting the 10-item structure.

1. Deelopdracht 1 (Easiest Task)
2. Deelopdracht 2
3. Deelopdracht 3
4. Deelopdracht 4
5. Deelopdracht 5
6. Deelopdracht 6
7. Deelopdracht 7
8. Deelopdracht 8
9. Deelopdracht 9
10. Deelopdracht 10 (Most Difficult Task)