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Brief Summary

The aim of this study is to investigate whether there are differences in muscle activation of the First Dorsal Interosseous (FDI) and the Abductor Pollicis Longus (APL) between individuals with and without trapeziometacarpal osteoarthritis (TMC OA) of the thumb. The study also seeks to identify which exercises are most effective for activating these muscles, in order to inform rehabilitation strategies for patients. The FDI has been defined as a key stabilizer of the thumb TMC joint. However, the literature reports various protocols for FDI activation and limited information on APL behavior during these exercises. OA TMC of the thumb can cause pain, decreased thumb strength, impaired hand function, and difficulty performing activities of daily living (ADLs). Appropriate rehabilitation is essential to maintain muscle function, limit joint degeneration, and improve hand performance; however, the exercises that optimally activate the FDI and APL muscles are not yet established. Participants will perform a series of standardized exercises and functional tasks designed to activate the FDI and APL muscles. Exercises include FDI strengthening with elastic bands in different hand positions (palmar and ulnar support), as well as exercises with the thumb in greater abduction. Functional tasks simulating everyday activities (e.g., turning a key, picking up a coin, writing, squeezing a tube of toothpaste, and holding a glass of water) will also be performed. Muscle activity will be recorded using surface electromyography (sEMG) during all tasks. Adults aged 40 years and older, both men and women, with TMC osteoarthritis and healthy controls without osteoarthritis will be invited to participate. Researchers will measure the activation patterns of the FDI and APL muscles during FDI activation exercises . The study aims to identify exercises that optimally activate these muscles, providing evidence to guide the rehabilitation of patients with thumb base osteoarthritis.

Outcome Measures

Primary Outcomes (2)

Surface electromyographic amplitude of the First Dorsal Interosseous muscle.
Mean surface electromyographic amplitude of the First Dorsal Interosseous muscle recorded during each of the 6 standardized exercises
Day 1
Surface electromyographic amplitude of the Abductor Pollicis Longus muscle
Mean surface electromyographic amplitude of the Abductor Pollicis Longus muscle recorded during each of the 6 standardized exercises
Day 1

Study Arms (1)

OA GROUP

Adults aged 18 years and older with a clinical diagnosis of thumb trapeziometacarpal (TMC) osteoarthritis. Participants will perform six standardized exercises designed to selectively activate the first dorsal interosseous (FDI) muscle, while surface electromyography (sEMG) of the FDI and abductor pollicis longus (APL) muscles is recorded. No pharmacological or physical intervention is administered beyond the exercises themselves; this is an observational measurement of muscle activation during standardized exercise performance.

Eligibility Criteria

Age18 Years+

Sexall

Healthy VolunteersYes

Age GroupsAdult (18-64), Older Adult (65+)

Sampling MethodNon-Probability Sample

Study Population

Participants were adults with a clinical diagnosis of thumb carpometacarpal osteoarthritis, recruited from the Universidad de Málaga.

You may qualify if:

Over 18 years of age

Related Publications (11)

McGee C, O'Brien V, Van Nortwick S, Adams J, Van Heest A. First dorsal interosseous muscle contraction results in radiographic reduction of healthy thumb carpometacarpal joint. J Hand Ther. 2015 Oct-Dec;28(4):375-80; quiz 381. doi: 10.1016/j.jht.2015.06.002. Epub 2015 Jun 27.

PMID: 26209165RESULT

Bertozzi L, Valdes K, Vanti C, Negrini S, Pillastrini P, Villafane JH. Investigation of the effect of conservative interventions in thumb carpometacarpal osteoarthritis: systematic review and meta-analysis. Disabil Rehabil. 2015;37(22):2025-43. doi: 10.3109/09638288.2014.996299. Epub 2015 Jan 5.

PMID: 25559974RESULT

FDI and APL Muscle Activation During Thumb Exercises in CMC Osteoarthritis

Brief Summary

Registry Overview

Trial Relationships

Study Timeline

First Submitted

First Posted

Study Start

Primary Completion

Study Completion

Conditions

Keywords

Outcome Measures

Primary Outcomes (2)

Study Arms (1)

OA GROUP

Eligibility Criteria

You may qualify if:

Sponsors & Collaborators

Study Sites (1)

Related Publications (11)

Enrollment

Study Design

Study Record Dates

You may not qualify if:

Source record

Locations

FDI and APL Muscle Activation During Thumb Exercises in CMC Osteoarthritis

Brief Summary

Registry Overview

Trial Relationships

Related Scientific Literature

Study Timeline

First Submitted

First Posted

Study Start

Primary Completion

Study Completion

Conditions

Keywords

Outcome Measures

Primary Outcomes (2)

Study Arms (1)

OA GROUP

Eligibility Criteria

You may qualify if:

Sponsors & Collaborators

Study Sites (1)

Related Publications (11)

Enrollment

Study Design

Study Record Dates

You may not qualify if:

Source record

Locations