Assessing finger joint biomechanics by applying equal force to flexor tendons In vitro using a novel simultaneous approach

Tai-Hua Yang, Szu-Ching Lu, Wei-Jr Lin, Kristin Zhao, Chunfeng Zhao, Kai-Nan An, I-Ming Jou, Pei-Yuan Lee, Li-Chieh Kuo, Fong-Chin Su

Research output: Contribution to journalArticle

2 Citations (Scopus)

Abstract

BACKGROUND: The flexor digitorum superficialis (FDS) and flexor digitorum profundus (FDP) are critical for finger flexion. Although research has recently focused on these tendons' coactivity, their contributions in different tasks remain unclear. This study created a novel simultaneous approach to investigate the coactivity between the tendons and to clarify their contributions in different tasks.

METHODS: Ten human cadaveric hands were mounted on our custom frame with the FDS and FDP of the third finger looped through a mechanical pulley connected to a force transducer. Joint range of motion, tendon excursion and loading force were recorded during individual joint motion and free joint movement from rest to maximal flexion. Each flexor tendon's moment arm was then calculated.

RESULTS: In individual motions, we found that the FDP contributed more than the FDS in proximal interphalangeal (PIP) joint motion, with an overall slope of 1.34 and all FDP-to-FDS excursion (P/S) ratios greater than 1.0 with force increase. However, the FDP contributed less than the FDS in metacarpophalangeal (MCP) joint motion, with an overall slope of 0.95 and P/S ratios smaller than 1.0 throughout the whole motion except between 1.9% and 13.1% force. In free joint movement, the FDP played a greater role than the FDS, with an overall ratio of 1.37 and all P/S ratios greater than 1.0.

CONCLUSIONS: The new findings include differences in finger performance and excursion amounts between the FDS and FDP throughout flexion. Such findings may provide the basis for new hand models and treatments.

LanguageEnglish
Article numbere0160301
Number of pages13
JournalPLOS One
Volume11
Issue number8
DOIs
Publication statusPublished - 11 Aug 2016

Fingerprint

Joints (anatomy)
Finger Joint
Tendons
tendons
Biomechanical Phenomena
Joints
Fingers
hands
Pulleys
Hand
Metacarpophalangeal Joint
Transducers
Articular Range of Motion
In Vitro Techniques
biomechanics
Research

Keywords

  • metacarpophalangeal Joint
  • biomechanical phenomena
  • range of motion
  • finger joint

Cite this

Yang, Tai-Hua ; Lu, Szu-Ching ; Lin, Wei-Jr ; Zhao, Kristin ; Zhao, Chunfeng ; An, Kai-Nan ; Jou, I-Ming ; Lee, Pei-Yuan ; Kuo, Li-Chieh ; Su, Fong-Chin. / Assessing finger joint biomechanics by applying equal force to flexor tendons In vitro using a novel simultaneous approach. In: PLOS One. 2016 ; Vol. 11, No. 8.
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title = "Assessing finger joint biomechanics by applying equal force to flexor tendons In vitro using a novel simultaneous approach",
abstract = "BACKGROUND: The flexor digitorum superficialis (FDS) and flexor digitorum profundus (FDP) are critical for finger flexion. Although research has recently focused on these tendons' coactivity, their contributions in different tasks remain unclear. This study created a novel simultaneous approach to investigate the coactivity between the tendons and to clarify their contributions in different tasks.METHODS: Ten human cadaveric hands were mounted on our custom frame with the FDS and FDP of the third finger looped through a mechanical pulley connected to a force transducer. Joint range of motion, tendon excursion and loading force were recorded during individual joint motion and free joint movement from rest to maximal flexion. Each flexor tendon's moment arm was then calculated.RESULTS: In individual motions, we found that the FDP contributed more than the FDS in proximal interphalangeal (PIP) joint motion, with an overall slope of 1.34 and all FDP-to-FDS excursion (P/S) ratios greater than 1.0 with force increase. However, the FDP contributed less than the FDS in metacarpophalangeal (MCP) joint motion, with an overall slope of 0.95 and P/S ratios smaller than 1.0 throughout the whole motion except between 1.9{\%} and 13.1{\%} force. In free joint movement, the FDP played a greater role than the FDS, with an overall ratio of 1.37 and all P/S ratios greater than 1.0.CONCLUSIONS: The new findings include differences in finger performance and excursion amounts between the FDS and FDP throughout flexion. Such findings may provide the basis for new hand models and treatments.",
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author = "Tai-Hua Yang and Szu-Ching Lu and Wei-Jr Lin and Kristin Zhao and Chunfeng Zhao and Kai-Nan An and I-Ming Jou and Pei-Yuan Lee and Li-Chieh Kuo and Fong-Chin Su",
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Yang, T-H, Lu, S-C, Lin, W-J, Zhao, K, Zhao, C, An, K-N, Jou, I-M, Lee, P-Y, Kuo, L-C & Su, F-C 2016, 'Assessing finger joint biomechanics by applying equal force to flexor tendons In vitro using a novel simultaneous approach' PLOS One, vol. 11, no. 8, e0160301. https://doi.org/10.1371/journal.pone.0160301

Assessing finger joint biomechanics by applying equal force to flexor tendons In vitro using a novel simultaneous approach. / Yang, Tai-Hua; Lu, Szu-Ching; Lin, Wei-Jr; Zhao, Kristin; Zhao, Chunfeng; An, Kai-Nan; Jou, I-Ming; Lee, Pei-Yuan; Kuo, Li-Chieh; Su, Fong-Chin.

In: PLOS One, Vol. 11, No. 8, e0160301, 11.08.2016.

Research output: Contribution to journalArticle

TY - JOUR

T1 - Assessing finger joint biomechanics by applying equal force to flexor tendons In vitro using a novel simultaneous approach

AU - Yang, Tai-Hua

AU - Lu, Szu-Ching

AU - Lin, Wei-Jr

AU - Zhao, Kristin

AU - Zhao, Chunfeng

AU - An, Kai-Nan

AU - Jou, I-Ming

AU - Lee, Pei-Yuan

AU - Kuo, Li-Chieh

AU - Su, Fong-Chin

PY - 2016/8/11

Y1 - 2016/8/11

N2 - BACKGROUND: The flexor digitorum superficialis (FDS) and flexor digitorum profundus (FDP) are critical for finger flexion. Although research has recently focused on these tendons' coactivity, their contributions in different tasks remain unclear. This study created a novel simultaneous approach to investigate the coactivity between the tendons and to clarify their contributions in different tasks.METHODS: Ten human cadaveric hands were mounted on our custom frame with the FDS and FDP of the third finger looped through a mechanical pulley connected to a force transducer. Joint range of motion, tendon excursion and loading force were recorded during individual joint motion and free joint movement from rest to maximal flexion. Each flexor tendon's moment arm was then calculated.RESULTS: In individual motions, we found that the FDP contributed more than the FDS in proximal interphalangeal (PIP) joint motion, with an overall slope of 1.34 and all FDP-to-FDS excursion (P/S) ratios greater than 1.0 with force increase. However, the FDP contributed less than the FDS in metacarpophalangeal (MCP) joint motion, with an overall slope of 0.95 and P/S ratios smaller than 1.0 throughout the whole motion except between 1.9% and 13.1% force. In free joint movement, the FDP played a greater role than the FDS, with an overall ratio of 1.37 and all P/S ratios greater than 1.0.CONCLUSIONS: The new findings include differences in finger performance and excursion amounts between the FDS and FDP throughout flexion. Such findings may provide the basis for new hand models and treatments.

AB - BACKGROUND: The flexor digitorum superficialis (FDS) and flexor digitorum profundus (FDP) are critical for finger flexion. Although research has recently focused on these tendons' coactivity, their contributions in different tasks remain unclear. This study created a novel simultaneous approach to investigate the coactivity between the tendons and to clarify their contributions in different tasks.METHODS: Ten human cadaveric hands were mounted on our custom frame with the FDS and FDP of the third finger looped through a mechanical pulley connected to a force transducer. Joint range of motion, tendon excursion and loading force were recorded during individual joint motion and free joint movement from rest to maximal flexion. Each flexor tendon's moment arm was then calculated.RESULTS: In individual motions, we found that the FDP contributed more than the FDS in proximal interphalangeal (PIP) joint motion, with an overall slope of 1.34 and all FDP-to-FDS excursion (P/S) ratios greater than 1.0 with force increase. However, the FDP contributed less than the FDS in metacarpophalangeal (MCP) joint motion, with an overall slope of 0.95 and P/S ratios smaller than 1.0 throughout the whole motion except between 1.9% and 13.1% force. In free joint movement, the FDP played a greater role than the FDS, with an overall ratio of 1.37 and all P/S ratios greater than 1.0.CONCLUSIONS: The new findings include differences in finger performance and excursion amounts between the FDS and FDP throughout flexion. Such findings may provide the basis for new hand models and treatments.

KW - metacarpophalangeal Joint

KW - biomechanical phenomena

KW - range of motion

KW - finger joint

U2 - 10.1371/journal.pone.0160301

DO - 10.1371/journal.pone.0160301

M3 - Article

VL - 11

JO - PLOS One

T2 - PLOS One

JF - PLOS One

SN - 1932-6203

IS - 8

M1 - e0160301

ER -