Lateral Digital Photography with Computeraided Goniometry versus Standard Goniometry for Recording Finger Joint Angles

2002 ◽  
Vol 27 (2) ◽  
pp. 184-186 ◽  
Author(s):  
G. A. GEORGEU ◽  
S. MAYFIELD ◽  
A. M. LOGAN
Keyword(s):  
Digital Photography ◽  
Finger Joint ◽  
Joint Angles ◽  
Digital Photographs ◽  
Finger Joints ◽  
Computer Aided ◽  
Flexion And Extension

This study compares the accuracy of computer-aided goniometry with standard goniometry. 109 finger joint angles at the extremes of flexion and extension were measured by a senior hand therapist using standard goniometry. Lateral digital photographs were then taken of the hands and the same angles were read from these by computer. There was good correlation ( r2=0.975) between the results. Computer goniometry averaged 1°(95%Cl=0°–+2°) more than the standard goniometry. We feel that computer goniometry of finger joints is accurate and compares well with standard goniometry.

scholarly journals Silicone and Pyrocarbon Artificial Finger Joints

2021 ◽  
Vol 2021 ◽  
pp. 1-12
Author(s):  
F. A. Alnaimat ◽  
H. A. Owida ◽  
A. Al Sharah ◽  
M. Alhaj ◽  
Mohammad Hassan
Keyword(s):  
Range Of Motion ◽  
Finger Joint ◽  
Silicone Implants ◽  
Dorsal Approach ◽  
Artificial Joints ◽  
Finger Joints ◽  
The Past ◽  
Flexion And Extension ◽  
Pyrocarbon Implant ◽  
Distal Stem

Artificial finger joint design has been developed through different stages through the past. PIP (proximal interphalangeal) and MCP (metacarpophalangeal) artificial finger joints have come to replace the amputation and arthrodesis options; although, these artificial joints are still facing challenges related to reactive tissues, reduced range of motion, and flexion and extension deficits. Swanson silicone artificial finger joints are still common due to the physician’s preferability of silicone with the dorsal approach during operation. Nevertheless, other artificial finger joints such as the pyrocarbon implant arthroplasty have also drawn the interests of practitioners. Artificial finger joint has been classified under three major categories which are constrained, unconstrained, and linked design. There are also challenges such as concerns of infections and articular cartilage necrosis associated with attempted retention of vascularity. In addition, one of the main challenges facing the silicone artificial finger joints is the fracture occurring at the distal stem with the hinge. The aim of this paper is to review the different artificial finger joints in one paper as there are few old review papers about them. Further studies need to be done to develop the design and materials of the pyrocarbon and silicone implants to increase the range of motion associated with them and the fatigue life of the silicone implants.

Application Study on Finger Joint Motion in Rehabilitation Training

2014 ◽  
Vol 644-650 ◽  
pp. 879-883
Author(s):  
Jing Jing Yu
Keyword(s):  
Control Method ◽  
Finger Joint ◽  
Continuous Passive Motion ◽  
Joint Motion ◽  
Joint Movement ◽  
Rehabilitation Training ◽  
Angle Data ◽  
Finger Flexion ◽  
And Control ◽  
Flexion And Extension

In various forms of movement of finger rehabilitation training, Continuous Passive Motion (CPM) of single degree of freedom (1 DOF) has outstanding application value. Taking classic flexion and extension movement for instance, this study collected the joint angle data of finger flexion and extension motion by experiments and confirmed that the joint motion of finger are not independent of each other but there is certain rule. This paper studies the finger joint movement rule from qualitative and quantitative aspects, and the conclusion can guide the design of the mechanism and control method of finger rehabilitation training robot.

Assessment of Muscle Activity and Joint Angles in Small-Handed Pianists: A Pilot Study on the 7/8-Sized Keyboard versus the Full-Sized Keyboard

2006 ◽  
Vol 21 (1) ◽  
pp. 3-9
Author(s):  
B G Wristen ◽  
M C Jung ◽  
A K G Wismer ◽  
M S Hallbeck
Keyword(s):  
Pilot Study ◽  
Research Question ◽  
Wrist Flexion ◽  
Joint Angles ◽  
Ulnar Deviation ◽  
Surface Electrodes ◽  
Musical Excerpt ◽  
Muscle Loading ◽  
Maximal Angle ◽  
Flexion And Extension

This pilot study examined whether the use of a 7/8 keyboard contributed to the physical ease of small-handed pianists as compared with the conventional piano keyboard. A secondary research question focused on the progression of physical ease in pianists making the transition from one keyboard to the other. For the purposes of this study, a hand span of 8 inches or less was used to define a “small-handed” pianist. The goal was to measure muscle loading and hand span during performance of a specified musical excerpt. For data collection, each of the two participants was connected to an 8-channel electromyography system via surface electrodes, which were attached to the upper back/shoulder, parts of the hand and arm, and masseter muscle of the jaw. Subjects also were fitted with electrogoniometers to capture how the span from the first metacarpophalangeal (MCP) joint to the fifth MCP joint moves according to performance demands, as well as wrist flexion and extension and radial and ulnar deviation. We found that small-handed pianists preferred the smaller keyboard and were able to transition between it and the conventional keyboard. The maximal angle of hand span while playing a difficult piece was about 5º smaller radially and 10º smaller ulnarly for the 7/8 keyboard, leading to perceived ease and better performance as rated by the pianists.

scholarly journals A Finger Grip Force Sensor with an Open-Pad Structure for Glove-Type Assistive Devices

Sensors ◽  
2019 ◽  
Vol 20 (1) ◽  
pp. 4 ◽  
Author(s):  
Junghoon Park ◽  
Pilwon Heo ◽  
Jung Kim ◽  
Youngjin Na
Keyword(s):  
Degrees Of Freedom ◽  
Grip Force ◽  
Force Sensor ◽  
Assistive Devices ◽  
Finger Joint ◽  
Assistive Device ◽  
Force Estimation ◽  
Joint Angles ◽  
Fingertip Force ◽  
Grasping Force

This paper presents a fingertip grip force sensor based on custom capacitive sensors for glove-type assistive devices with an open-pad structure. The design of the sensor allows using human tactile sensations during grasping and manipulating an object. The proposed sensor can be attached on both sides of the fingertip and measure the force caused by the expansion of the fingertip tissue when a grasping force is applied to the fingertip. The number of measurable degrees of freedom (DoFs) are the two DoFs (flexion and adduction) for the thumb and one DoF (flexion) for the index and middle fingers. The proposed sensor allows the combination with a glove-type assistive device to measure the fingertip force. Calibration was performed for each finger joint angle because the variations in the expansion of the fingertip tissue depend on the joint angles. The root mean square error (RMSE) for fingertip force estimation ranged from 3.75% to 9.71% after calibration, regardless of the finger joint angles or finger posture.

scholarly journals A Three-dimensional Finger Motion Measurement System of a Thumb and an Index Finger Without a Calibration Process

Sensors ◽  
2020 ◽  
Vol 20 (3) ◽  
pp. 756 ◽  
Author(s):  
Yeongyu Park ◽  
Joonbum Bae
Keyword(s):  
Index Finger ◽  
Three Dimensional ◽  
Length Change ◽  
Measuring Method ◽  
Finger Joint ◽  
Joint Angles ◽  
Calibration Process ◽  
Hand Motion ◽  
Wearable Systems ◽  
Cmc Joint

Various wearable systems have been investigated to measure hand motion, but some challenges remain. Many systems require a calibration process to map sensor signals to actual finger joint angles by the principle of measuring the length change of the finger, or bending sensors. Also, few studies have investigated how to measure thumb motion accurately using the wearable systems. This paper proposes an exoskeleton system with linear Hall sensors to measure three-dimensional hand motion without a calibration process. The calibration process is avoided by measuring finger joint angles through an absolute rotation measurement. A new wearing method with lower parts underneath the hand joints and rubber bands is proposed to fix the structure to the hand and adapt it for various hand sizes. As the thumb has a complex biomechanical feature at carpometacarpal (CMC) joint, a new measuring method of the CMC joint is proposed to directly calculate the orientation of the metacarpal. The prototype of the thumb and index finger was manufactured, and the performance was verified experimentally by using an optical motion capture system.

scholarly journals Increased yield of finger jointed structural timber by accounting for grain orientation utilizing the tracheid effect

2019 ◽  
Vol 77 (6) ◽  
pp. 1063-1077
Author(s):  
Anders Olsson ◽  
Andreas Briggert ◽  
Jan Oscarsson
Keyword(s):  
Grain Orientation ◽  
Minimum Distance ◽  
Fibre Orientation ◽  
Structural Timber ◽  
Finger Joint ◽  
European Standard ◽  
Clear Wood ◽  
Finger Joints ◽  
Tracheid Effect

Abstract Finger joints in structural timber and glulam lamellae are often used to enable production of long members or to allow for re-connection of parts of a member after removal of weak sections. According to the European Standard EN 15497, certain margins are required between knots and a finger joint in structural timber, which means that a considerable amount of clear wood becomes waste when finger joints are applied. The purpose of this paper was to investigate the possibility of reducing the quantity of waste using different criteria for placement of finger joints. The investigation was based on (1) application of methods of colour scanning and tracheid effect scanning to detect knots and grain disturbance on board surfaces, and (2) interpretation of the requirements of EN 15497 regarding where finger joints may be placed. The standard’s requirement when producing finger joints is that the minimum distance between a knot and a finger joint is three times the knot diameter. The standard allows for the minimum distance between a knot and a finger joint to be shortened to 1.5 times the diameter when the local fibre orientation is measured. Utilizing this in simulated production resulted in reduction of waste from 7.4 to 4.0%, when using finger joints simply to produce timber of long lengths. If finger joints are also used to re-connect parts of members after removal of weak sections, even larger savings can be made. Furthermore, it is concluded that knowledge of fibre orientation obtained from scanning could be used not only to decrease the waste in production but also to increase the quality of finger joints.

The Thin Cross Finger Skin Flap

2007 ◽  
Vol 32 (4) ◽  
pp. 417-420 ◽  
Author(s):  
S. GOKREM ◽  
D. TUNCALI ◽  
A. TERZIOGLU ◽  
K. TOKSOY ◽  
G. ASLAN
Keyword(s):  
Skin Flap ◽  
Extensor Tendon ◽  
Finger Joint ◽  
Joint Movement ◽  
Graft Take ◽  
Subcutaneous Tissues ◽  
The Cross ◽  
Finger Skin ◽  
Flexion And Extension

The cross-finger flap has been used successfully for decades. Traditionally, the flap is elevated in the plane lying superficial to the extensor tendon. This damages the delicate subcutaneous tissues, which are important for the lengthening capacity of the skin of the dorsum of the fingers during flexion and extension. In this report, we present a modification of elevation of the cross-finger flap in a plane superficial to the dorsal veins of the fingers. This modification prevents donor finger complications such as poor graft take, extensor tendon adhesion to the graft and reduced range of finger joint movement and contour deformities. We have used this technique in six digits in four patients with successful results.

Computer-aided classification of optical images for diagnosis of osteoarthritis in the finger joints

2011 ◽  
Vol 19 (4) ◽  
pp. 531-544 ◽  
Author(s):  
Jiang Zhang ◽  
James Z. Wang ◽  
Zhen Yuan ◽  
Eric S. Sobel ◽  
Huabei Jiang
Keyword(s):  
Finger Joints ◽  
Optical Images ◽  
Computer Aided
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