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At least 199 records · Page 11Linked to original sources
PubMed2000

A case report of total finger joint replacement arthroplasty after traumatic amputation.

INTRODUCTION: Joint reconstruction following trauma at the proximal interphalangeal or metacarpophalangeal levels remain a difficult problem in hand surgery. Function of the injured finger depends on the mobility and stability at these joints. In fingers amputated at these levels with joint destruction, the hand surgeon can perform either an arthrodesis or a replacement arthroplasty (either as an emergency or as a secondary procedure). Arthrodesis will give a stable pain-free joint, but at the cost of sacrificing mobility and even cosmesis. CLINICAL PICTURE: We report a case of traumatic amputation through the proximal interphalangeal joint (PIPJ) of the right middle finger. Arthrodesis of the PIPJ in extension using Kirschner wires was performed following replantation due to extensive periarticular soft tissue loss, so as to enable repair and healing of the extensor mechanism. This results in poor cosmesis and stiffness of finger interfering with function three months after surgery. TREATMENT AND OUTCOME: A prosthetic total joint replacement of PIPJ was performed as a secondary procedure. Satisfactory hand function and finger movement ensued two years after the procedure, with no loosening or infection of the implant. CONCLUSION: Total interphalangeal joint arthroplasty is a useful secondary procedure, after the initial replantation, for finger amputation with periarticular soft tissue loss.

Adult↗
PubMed1990

[Reconstruction after traumatic destruction of the finger joints].

Miniaturized osteosynthesis still is the best solution for articular injuries, but in case of destruction the indications will depend on several patient-linked factors (age, handedness, profession...) and on the loss of substance. In case of limited loss of substance, Swanson's prosthesis provided an average mobility of 48 degrees at the MP level and 34 degrees at the PIP level. In case of extensive osteoarticular loss, only island or free vascularized articular transfer allow avoiding arthrodesis. The transfers provided mobility exceeding 45 degrees at the MP level and 42 degrees at the PIP level, therefore better values than with free articular toe transfers (35 degrees for the MP joints and 23 degrees for the PIP joints).

Adult↗
PubMed2006

Keyswitch orientation can reduce finger joint torques during tapping on a computer keyswitch.

OBJECTIVE: To examine the effects of keyswitch orientation on joint torques. BACKGROUND: The fingertip produces primarily vertical forces during single-finger tapping on a computer keyswitch. However, horizontal force components within the sagittal plane of the finger could reduce net joint torques. METHOD: Eleven participants tapped on a keyswitch oriented in three directions: vertical, tilted 30 degrees such that when pressed it moved away from the user (similar to a positive-tilt keyboard), and tilted 30 degrees such that when pressed it moved toward the user (similar to a negative-tilt keyboard). Participants also tapped on a prototype cantilever keyswitch design in which the key cap moves along the arc of a bending beam gradually away from the user. Miniature electro-optical goniometers measured the finger posture, and a two-axis force sensor measured fingertip forces. RESULTS: Tapping on a keyswitch oriented such that it moves away from the user when pressed reduced net joint torques by 47% relative to tapping on a vertically orientated keyswitch and by 56% relative to tapping on a keyswitch oriented toward the user, whereas the cantilever design resulted in 14% decreases in net joint torque relative to the vertical orientation. CONCLUSION: Reductions of torques resulted from decreasing the moment arm of the fingertip force about the joints. APPLICATION: Keyboard design should incorporate keyswitch mechanism angles along with other postural and geometric constraints to reduce exposure of the finger joints and muscles to force during typing.

Adult↗
PubMed1985

Biometrical study of flexion of the long fingers joints in prehension.

The angles of flexion of the three digital joints were measured in 112 hands while grasping test cylinders the diameter of which ranged from 8 to 90 mm. Based on the average of several measurements, the angles of overall and joint-by-joint flexion were determined for each cylinder size. Studied finger by finger, it was shown the each digit has its individual pattern of flexion, the angles of flexion of each joint being different for each finger. Flexion is prevalent in the proximal interphalangeal joint of the index while it is prevalent in the metacarpophalangeal joint of the little finger. When the standard deviation values were calculated, they showed that the individual variations were relatively small in cylindrical grasps. This is the opposite of what was observed in two of the pinches between the thumb and the other fingers. In these cases, the values of the angles of flexion were remarkably dispersed according to the individuals, especially in the proximal interphalangeal joint.

Adolescent↗