# The Psychometric Properties of the Moberg Pick-Up Test (MPUT) to Assess Fine Motor Skills in Adults with Haemophilia

## TL;DR

This study evaluates the Moberg Pick-Up Test as a reliable and partially valid tool for assessing fine motor skills in adults with haemophilia.

## Contribution

The study is the first to evaluate the psychometric properties of the Moberg Pick-Up Test specifically in adults with haemophilia.

## Key findings

- The MPUT showed moderate-to-excellent inter-rater and test–retest reliability in PwH.
- MPUT scores correlated moderately with subjective hand function and elbow joint health in some cases.
- Left-hand MPUT scores did not correlate with left elbow joint health scores.

## Abstract

Background/Objectives: Haemophilia-related bleedings primarily affect the musculoskeletal system, and functional tests are used in clinical management. Yet, fine motor skills of the upper extremities have not been evaluated in adult persons with haemophilia (PwH). The Moberg Pick-Up Test (MPUT) assesses fine motor skills but has only been psychometrically evaluated in other cohorts. This study aims to examine its psychometric properties in PwH. Methods: A total of 40 moderate or severe PwH A or B were included. The MPUT, consisting of three trials, was conducted twice by rater A and once by rater B. The best performance per hand of each MPUT was used. Subjective hand function (Duruöz Hand Index (DHI) and numeric rating scale (NRS)), elbow joint status (Haemophilia Joint Health Score (HJHS)), pain (NRS), and wrist range of motion (ROM) were utilised for convergent validity evaluation. Inter-rater and test–retest reliability were determined through intraclass correlation coefficients (ICCs) for raw and log10-transformed data. Results: Inter-rater and test–retest reliability demonstrated moderate-to-excellent ICCs for both data types (ICC range: 0.624–0.918). The DHI correlated moderately with the average MPUT score of both hands (r = 0.410; p = 0.016). Left-hand MPUT scores did not correlate with left elbow HJHS scores, whereas right-hand MPUT scores correlated with right elbow HJHS scores (r = 0.396, p = 0.018). Subjective left-hand function (NRS) correlated with the results of the MPUT (r = 0.433; p = 0.009). Conclusions: The MPUT is a reliable and partially valid tool and can be useful to assess fine motor skills in PwH.