Kinematic evaluation of the finger’s interphalangeal joints coupling mechanism—variability, flexion–extension differences, triggers, locking swanneck deformities, anthropometric correlations

Leijnse, J.N.A.L.; Quesada, Peter M.; Spoor, C.W.

doi:10.1016/j.jbiomech.2010.04.021

Cited by 41 publications

(34 citation statements)

References 28 publications

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“…Varying string attachment points and lengths created EAs with different IP-coupled trajectories. For validation, the 68 IP trajectories measured in Leijnse et al (2010), were fitted, producing 68 individual EA morphologies detailing functional EA properties, including the role of RL and OL.…”

Section: Aims and Methodsmentioning

confidence: 99%

“…The fingers' interphalangeal (IP) joints, called proximal (PIP) and distal (DIP), rotate as a mechanism when the deep finger flexor (FP) is active (Landsmeer, 1958;Spoor and Landsmeer, 1976;Buchner et al, 1988;Darling et al, 1994;Hahn et al, 1995;Leijnse, 1997;Leijnse et al, 2010). The IP coupling results from the complex IP extensor tendon, called the extensor apparatus (EA), which inserts into both the middle and distal phalanges.…”

Section: Anatomy and Biomechanicsmentioning

confidence: 99%

“…The 68 experimentally determined IP trajectories y 3 (y 2 ) ek (k¼ trajectory number) of Leijnse et al (2010), were fitted over the entire IP range by individual model trajectories y 3 (y 2 ) mk , to produce 68 individual EA k morphologies, by: min½RMSðy 3 ðy 2 Þ mk Ày 3 ðy 2 Þ ek Þ ðaÞ RMS o 0:5deg for y 2 o y 2 n , max y 2 n ðbÞ y 3 ðy 2max Þ mk ffi y 3 ðy 2max Þ ek , y 2max ¼ minðy 2e,max ,110degÞ ðcÞ…”

Section: Reverse Engineering Ea Morphologies From Measured Ip Trajectmentioning

confidence: 99%

“…5A), producing the y 3 (y 2 ) OL in (v) IP coupling depends on the moment arms r 3T and r 2M -as well as on the relative length and even curvature of the proximal two phalanges. However, these geometries were not recorded with the target trajectories (Leijnse et al, 2010). To allow some anthropometric variability, r 3T was varied within 3.5 r r 3T r 4 mm (per iteration, its value was kept constant for the calculation Fig.…”

Section: Reverse Engineering Ea Morphologies From Measured Ip Trajectmentioning

confidence: 99%

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Reverse engineering finger extensor apparatus morphology from measured coupled interphalangeal joint angle trajectories — a generic 2D kinematic model

Leijnse

Spoor

2012

Journal of Biomechanics

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Section: Aims and Methodsmentioning

confidence: 99%

Section: Anatomy and Biomechanicsmentioning

confidence: 99%

Section: Reverse Engineering Ea Morphologies From Measured Ip Trajectmentioning

confidence: 99%

Section: Reverse Engineering Ea Morphologies From Measured Ip Trajectmentioning

confidence: 99%

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Reverse engineering finger extensor apparatus morphology from measured coupled interphalangeal joint angle trajectories — a generic 2D kinematic model

Leijnse

Spoor

2012

Journal of Biomechanics

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“…PIP joints and MCP joints can move voluntarily, and DIP joints move subordinately to PIP joint movement [14]. Therefore, eight voluntary finger motion types are possible by combining two finger joints (MCP and PIP) and two directions of motion (flexion and extension) (Fig.…”

Section: Target Keys On Our Keyboard-mounted Mousementioning

confidence: 99%

A method for using one finger to press three separate keys on a three-dimensional keyboard designed to be mounted on a mouse

et al. 2016

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Here we propose and verify the feasibility of a new keyboard structure for keyboard-mounted mouse. Reducing the distance that fingers move while typing within a three-dimensional (3-D) key arrangement that fits along the fingers is effective for keyboard-mounted mouse, provided that each finger can separately press three different keys. Our objective was to design and test a method for separately being able to press three keys with a single finger, and in the process, reduce finger-moving distance. We analyzed 3-D finger motion while participants typed on a standard keyboard, and used this data to develop a 3-D layout for keys that are arranged along the fingers. Analysis of 3-D finger motion while using our new keyboard showed that the distance fingers traveled was 74 % less than that when using a standard keyboard (p < 0.05). Moreover, this did not result in typing mistakes caused by interference between the keys and finger movements. After typing 30 characters 20 times, the average input error rate in the 20th trial was 18 %, while the average error rate across all trials for the standard keyboard was 9.5 %. We conclude that our proposed 3-D keyboard can be used accurately with one finger while reducing the distance fingers must move. However, input mistakes were caused by finger linkage motion. In the future, we must devise a character-input algorithm that eliminates such erroneous input. We must also include the mouse function and evaluate the operability of the device in tasks that require keyboard and mouse use.

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Beckerle¹

2021

Springer Series on Touch and Haptic Systems

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Kinematic evaluation of the finger’s interphalangeal joints coupling mechanism—variability, flexion–extension differences, triggers, locking swanneck deformities, anthropometric correlations

Cited by 41 publications

References 28 publications

Reverse engineering finger extensor apparatus morphology from measured coupled interphalangeal joint angle trajectories — a generic 2D kinematic model

Reverse engineering finger extensor apparatus morphology from measured coupled interphalangeal joint angle trajectories — a generic 2D kinematic model

A method for using one finger to press three separate keys on a three-dimensional keyboard designed to be mounted on a mouse

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