Kinematics and functional characteristics of the Pritchard ERS unlinked total elbow arthroplasty

Matthew Ramsey, Patricia G. Neale, Bernard F. Morrey, Shawn W. O'Driscoll, Kai Nan An

Research output: Contribution to journalArticle

17 Citations (Scopus)

Abstract

This study examined the kinematic characteristics of the Pritchard ERS elbow-resurfacing system, with special attention paid to the effects of the radial head component. The kinematics between the ulna and humerus were assessed in 6 human cadaveric specimens by an electromagnetic tracking system throughout a full flexion/extension range of motion. The elbows were studied under 2 loading conditions, in 3 orientations (neutral, varus, and valgus), and under 4 surgical conditions. The varus/valgus and internal/external rotation laxities were used to assess the condition differences. Specifically, the maximum laxities throughout the extension motion were compared, as were the laxities at 40°, 75°, and 110° of flexion. Both the varus/valgus and internal/external rotation laxities of the ulnohumeral joint increased after total elbow arthroplasty (TEA) implantation, with and without a radial head. This increase was most evident in the extension portion of the arc of motion. At 40° of flexion, the varus/valgus laxity of the intact elbow was 4° ± 2° versus 11° ± 8° for a TEA with a radial head and 22° ± 11° for a TEA without a radial head while the elbow was being subjected to compressive loads via the biceps, brachialis, and triceps. The kinematic data demonstrate a consistent increase in laxity with the Pritchard ERS TEA. They also indicate that a radial head component is necessary for optimal tracking and stability of the ERS arthroplasty.

Original languageEnglish (US)
Pages (from-to)385-390
Number of pages6
JournalJournal of Shoulder and Elbow Surgery
Volume12
Issue number4
DOIs
StatePublished - Jul 2003

Fingerprint

Elbow
Biomechanical Phenomena
Arthroplasty
Joint Instability
Ulna
Electromagnetic Phenomena
Humerus
Articular Range of Motion

ASJC Scopus subject areas

  • Orthopedics and Sports Medicine
  • Surgery

Cite this

Kinematics and functional characteristics of the Pritchard ERS unlinked total elbow arthroplasty. / Ramsey, Matthew; Neale, Patricia G.; Morrey, Bernard F.; O'Driscoll, Shawn W.; An, Kai Nan.

In: Journal of Shoulder and Elbow Surgery, Vol. 12, No. 4, 07.2003, p. 385-390.

Research output: Contribution to journalArticle

Ramsey, Matthew ; Neale, Patricia G. ; Morrey, Bernard F. ; O'Driscoll, Shawn W. ; An, Kai Nan. / Kinematics and functional characteristics of the Pritchard ERS unlinked total elbow arthroplasty. In: Journal of Shoulder and Elbow Surgery. 2003 ; Vol. 12, No. 4. pp. 385-390.
@article{2fb10d1fecc14727bb941f5821859487,
title = "Kinematics and functional characteristics of the Pritchard ERS unlinked total elbow arthroplasty",
abstract = "This study examined the kinematic characteristics of the Pritchard ERS elbow-resurfacing system, with special attention paid to the effects of the radial head component. The kinematics between the ulna and humerus were assessed in 6 human cadaveric specimens by an electromagnetic tracking system throughout a full flexion/extension range of motion. The elbows were studied under 2 loading conditions, in 3 orientations (neutral, varus, and valgus), and under 4 surgical conditions. The varus/valgus and internal/external rotation laxities were used to assess the condition differences. Specifically, the maximum laxities throughout the extension motion were compared, as were the laxities at 40°, 75°, and 110° of flexion. Both the varus/valgus and internal/external rotation laxities of the ulnohumeral joint increased after total elbow arthroplasty (TEA) implantation, with and without a radial head. This increase was most evident in the extension portion of the arc of motion. At 40° of flexion, the varus/valgus laxity of the intact elbow was 4° ± 2° versus 11° ± 8° for a TEA with a radial head and 22° ± 11° for a TEA without a radial head while the elbow was being subjected to compressive loads via the biceps, brachialis, and triceps. The kinematic data demonstrate a consistent increase in laxity with the Pritchard ERS TEA. They also indicate that a radial head component is necessary for optimal tracking and stability of the ERS arthroplasty.",
author = "Matthew Ramsey and Neale, {Patricia G.} and Morrey, {Bernard F.} and O'Driscoll, {Shawn W.} and An, {Kai Nan}",
year = "2003",
month = "7",
doi = "10.1016/S1058-2746(02)86885-9",
language = "English (US)",
volume = "12",
pages = "385--390",
journal = "Journal of Shoulder and Elbow Surgery",
issn = "1058-2746",
publisher = "Mosby Inc.",
number = "4",

}

TY - JOUR

T1 - Kinematics and functional characteristics of the Pritchard ERS unlinked total elbow arthroplasty

AU - Ramsey, Matthew

AU - Neale, Patricia G.

AU - Morrey, Bernard F.

AU - O'Driscoll, Shawn W.

AU - An, Kai Nan

PY - 2003/7

Y1 - 2003/7

N2 - This study examined the kinematic characteristics of the Pritchard ERS elbow-resurfacing system, with special attention paid to the effects of the radial head component. The kinematics between the ulna and humerus were assessed in 6 human cadaveric specimens by an electromagnetic tracking system throughout a full flexion/extension range of motion. The elbows were studied under 2 loading conditions, in 3 orientations (neutral, varus, and valgus), and under 4 surgical conditions. The varus/valgus and internal/external rotation laxities were used to assess the condition differences. Specifically, the maximum laxities throughout the extension motion were compared, as were the laxities at 40°, 75°, and 110° of flexion. Both the varus/valgus and internal/external rotation laxities of the ulnohumeral joint increased after total elbow arthroplasty (TEA) implantation, with and without a radial head. This increase was most evident in the extension portion of the arc of motion. At 40° of flexion, the varus/valgus laxity of the intact elbow was 4° ± 2° versus 11° ± 8° for a TEA with a radial head and 22° ± 11° for a TEA without a radial head while the elbow was being subjected to compressive loads via the biceps, brachialis, and triceps. The kinematic data demonstrate a consistent increase in laxity with the Pritchard ERS TEA. They also indicate that a radial head component is necessary for optimal tracking and stability of the ERS arthroplasty.

AB - This study examined the kinematic characteristics of the Pritchard ERS elbow-resurfacing system, with special attention paid to the effects of the radial head component. The kinematics between the ulna and humerus were assessed in 6 human cadaveric specimens by an electromagnetic tracking system throughout a full flexion/extension range of motion. The elbows were studied under 2 loading conditions, in 3 orientations (neutral, varus, and valgus), and under 4 surgical conditions. The varus/valgus and internal/external rotation laxities were used to assess the condition differences. Specifically, the maximum laxities throughout the extension motion were compared, as were the laxities at 40°, 75°, and 110° of flexion. Both the varus/valgus and internal/external rotation laxities of the ulnohumeral joint increased after total elbow arthroplasty (TEA) implantation, with and without a radial head. This increase was most evident in the extension portion of the arc of motion. At 40° of flexion, the varus/valgus laxity of the intact elbow was 4° ± 2° versus 11° ± 8° for a TEA with a radial head and 22° ± 11° for a TEA without a radial head while the elbow was being subjected to compressive loads via the biceps, brachialis, and triceps. The kinematic data demonstrate a consistent increase in laxity with the Pritchard ERS TEA. They also indicate that a radial head component is necessary for optimal tracking and stability of the ERS arthroplasty.

UR - http://www.scopus.com/inward/record.url?scp=0042562188&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=0042562188&partnerID=8YFLogxK

U2 - 10.1016/S1058-2746(02)86885-9

DO - 10.1016/S1058-2746(02)86885-9

M3 - Article

C2 - 12934036

AN - SCOPUS:0042562188

VL - 12

SP - 385

EP - 390

JO - Journal of Shoulder and Elbow Surgery

JF - Journal of Shoulder and Elbow Surgery

SN - 1058-2746

IS - 4

ER -