Hypermobility, Joint
Conditions
Keywords
volar plate, hypermobility, biomechanics
Brief summary
Background: The volar plate (VP) is a key stabilizer of the proximal interphalangeal joint (PIPJ), and its biomechanical behavior may be altered in individuals with joint hypermobility. Objective: This study aimed to evaluate the spatial dynamics of the VP and its relationship with the center of joint motion and flexor digitorum profundus (FDP) tendon in individuals with and without joint hyperlaxity using MRI. Methods: Thirty-two healthy volunteers (16 hyperlax, 16 controls) underwent MRI imaging of both index fingers at five flexion angles (0°, 30°, 60°, 90°, full flexion) and under passive and isometric loading conditions. Key parameters measured included distances from the joint center to VP attachments, VP-FDP tendon distance, and the length between VP ends.
Interventions
None listed
Sponsors
Baskent University Ankara Hospital
Hacettepe University
Study design
Observational model
CASE_CONTROL
Time perspective
PROSPECTIVE
Eligibility
Sex/Gender
ALL
Age
18 Years to 65 Years
Healthy volunteers
Yes
Inclusion criteria
* between 18-65 years
Exclusion criteria
* any history of acute or overuse injuries to the examined hand, * any prior surgical procedures on the examined upper extremity.
Design outcomes
Primary
| Measure | Time frame | Description |
|---|---|---|
| The Distance Between the Center of Motion (CoM) and the VPLip and VPTip | baseline | The distances between the center of motion (CoM) and the volar lip of the middle phalanx base (VPLip), and between the CoM and the proximal end of the volar plate at its attachment to the volar base of the proximal phalanx (VPTip), were measured using RadiAnt DICOM Viewer software (version 2024.1) in various PIPJ angles. |
| The Distance Between VPLip and VPTip | baseline | The distance between the volar lip of the middle phalanx base (VPLip), and the proximal end of the volar plate at its attachment to the volar base of the proximal phalanx (VPTip) measured using RadiAnt DICOM Viewer software (version 2024.1) in various PIPJ angles. The purpose of this measurement was to observe how the distance between the two ends of the volar plate changes with varying joint angles. |
| The Distance Between Volar Plate (VP) and FDP Tendon | baseline | The distance between the midpoint of the volar plate (VP) and the flexor digitorum profundus (FDP) tendon was measured using RadiAnt DICOM Viewer software (version 2024.1) at various proximal interphalangeal joint (PIPJ) angles. The purpose of this measurement was to observe how this distance changes across different flexion angles. |
| Changes Observed During Grasping and Isometric Contraction | baseline | Measurements at all flexion angles were conducted under two conditions: while passively grasping a cylindrical object (without force) and during isometric contraction (with force). |
Countries
Turkey (Türkiye)
Outcome results
None listed