Can ulnar variance be used to detect overstuffing after radial head arthroplasty?

Jungyu Moon, Jin Ho Hong, Nitin Bither, Won Yong Shon

Research output: Contribution to journalArticle

3 Citations (Scopus)

Abstract

Background: Overstuffing of the radiocapitellar joint during metallic radial head arthroplasty has been reported to cause loss of elbow flexion, capitellar erosion, and early-onset osteoarthritis. Although this is known, there is no agreed-on measurement approach to determine whether overstuffing has occurred. Questions/purposes: We therefore hypothesized that overlengthening the radial head during radial head arthroplasty changes the ulnar variance in the wrist. Methods: Seven cadaveric radii were implanted with radial head prostheses of increasing thickness. Each specimen was implanted successively with increasingly thick radial head prostheses measuring 2, 4, and 6 mm thicker than the native radial head, and radiographs were taken after implantation of each prosthesis. The ulnar variance with each prosthesis was measured using the method of perpendiculars. Results: The ulnar variance of the native and 2-mm (p = 0.04), 4-mm (p = 0.008), and 6-mm (p = 0.008) overly thick radial head prosthesis-implanted states decreased significantly with each incremental increase in prosthetic head thickness. Conclusions: Implantation of thicker radial head prostheses decreased the ulnar variance. Our results indicate ulnar variance could be used to detect overstuffing of radial head prostheses. Clinical Relevance: The simplicity and reliability of ulnar variance make it a potentially useful indicator of overlengthening after radial head arthroplasty.

Original languageEnglish
Pages (from-to)727-731
Number of pages5
JournalClinical Orthopaedics and Related Research
Volume472
Issue number2
DOIs
Publication statusPublished - 2014 Feb 1

Fingerprint

Arthroplasty
Prostheses and Implants
Prosthesis Implantation
Elbow
Wrist
Osteoarthritis
Joints
Head

ASJC Scopus subject areas

  • Orthopedics and Sports Medicine

Cite this

Can ulnar variance be used to detect overstuffing after radial head arthroplasty? / Moon, Jungyu; Hong, Jin Ho; Bither, Nitin; Shon, Won Yong.

In: Clinical Orthopaedics and Related Research, Vol. 472, No. 2, 01.02.2014, p. 727-731.

Research output: Contribution to journalArticle

Moon, Jungyu ; Hong, Jin Ho ; Bither, Nitin ; Shon, Won Yong. / Can ulnar variance be used to detect overstuffing after radial head arthroplasty?. In: Clinical Orthopaedics and Related Research. 2014 ; Vol. 472, No. 2. pp. 727-731.
@article{209abe06a9254f569692379a42f1782c,
title = "Can ulnar variance be used to detect overstuffing after radial head arthroplasty?",
abstract = "Background: Overstuffing of the radiocapitellar joint during metallic radial head arthroplasty has been reported to cause loss of elbow flexion, capitellar erosion, and early-onset osteoarthritis. Although this is known, there is no agreed-on measurement approach to determine whether overstuffing has occurred. Questions/purposes: We therefore hypothesized that overlengthening the radial head during radial head arthroplasty changes the ulnar variance in the wrist. Methods: Seven cadaveric radii were implanted with radial head prostheses of increasing thickness. Each specimen was implanted successively with increasingly thick radial head prostheses measuring 2, 4, and 6 mm thicker than the native radial head, and radiographs were taken after implantation of each prosthesis. The ulnar variance with each prosthesis was measured using the method of perpendiculars. Results: The ulnar variance of the native and 2-mm (p = 0.04), 4-mm (p = 0.008), and 6-mm (p = 0.008) overly thick radial head prosthesis-implanted states decreased significantly with each incremental increase in prosthetic head thickness. Conclusions: Implantation of thicker radial head prostheses decreased the ulnar variance. Our results indicate ulnar variance could be used to detect overstuffing of radial head prostheses. Clinical Relevance: The simplicity and reliability of ulnar variance make it a potentially useful indicator of overlengthening after radial head arthroplasty.",
author = "Jungyu Moon and Hong, {Jin Ho} and Nitin Bither and Shon, {Won Yong}",
year = "2014",
month = "2",
day = "1",
doi = "10.1007/s11999-013-3277-z",
language = "English",
volume = "472",
pages = "727--731",
journal = "Clinical Orthopaedics and Related Research",
issn = "0009-921X",
publisher = "Springer New York",
number = "2",

}

TY - JOUR

T1 - Can ulnar variance be used to detect overstuffing after radial head arthroplasty?

AU - Moon, Jungyu

AU - Hong, Jin Ho

AU - Bither, Nitin

AU - Shon, Won Yong

PY - 2014/2/1

Y1 - 2014/2/1

N2 - Background: Overstuffing of the radiocapitellar joint during metallic radial head arthroplasty has been reported to cause loss of elbow flexion, capitellar erosion, and early-onset osteoarthritis. Although this is known, there is no agreed-on measurement approach to determine whether overstuffing has occurred. Questions/purposes: We therefore hypothesized that overlengthening the radial head during radial head arthroplasty changes the ulnar variance in the wrist. Methods: Seven cadaveric radii were implanted with radial head prostheses of increasing thickness. Each specimen was implanted successively with increasingly thick radial head prostheses measuring 2, 4, and 6 mm thicker than the native radial head, and radiographs were taken after implantation of each prosthesis. The ulnar variance with each prosthesis was measured using the method of perpendiculars. Results: The ulnar variance of the native and 2-mm (p = 0.04), 4-mm (p = 0.008), and 6-mm (p = 0.008) overly thick radial head prosthesis-implanted states decreased significantly with each incremental increase in prosthetic head thickness. Conclusions: Implantation of thicker radial head prostheses decreased the ulnar variance. Our results indicate ulnar variance could be used to detect overstuffing of radial head prostheses. Clinical Relevance: The simplicity and reliability of ulnar variance make it a potentially useful indicator of overlengthening after radial head arthroplasty.

AB - Background: Overstuffing of the radiocapitellar joint during metallic radial head arthroplasty has been reported to cause loss of elbow flexion, capitellar erosion, and early-onset osteoarthritis. Although this is known, there is no agreed-on measurement approach to determine whether overstuffing has occurred. Questions/purposes: We therefore hypothesized that overlengthening the radial head during radial head arthroplasty changes the ulnar variance in the wrist. Methods: Seven cadaveric radii were implanted with radial head prostheses of increasing thickness. Each specimen was implanted successively with increasingly thick radial head prostheses measuring 2, 4, and 6 mm thicker than the native radial head, and radiographs were taken after implantation of each prosthesis. The ulnar variance with each prosthesis was measured using the method of perpendiculars. Results: The ulnar variance of the native and 2-mm (p = 0.04), 4-mm (p = 0.008), and 6-mm (p = 0.008) overly thick radial head prosthesis-implanted states decreased significantly with each incremental increase in prosthetic head thickness. Conclusions: Implantation of thicker radial head prostheses decreased the ulnar variance. Our results indicate ulnar variance could be used to detect overstuffing of radial head prostheses. Clinical Relevance: The simplicity and reliability of ulnar variance make it a potentially useful indicator of overlengthening after radial head arthroplasty.

UR - http://www.scopus.com/inward/record.url?scp=84893680549&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=84893680549&partnerID=8YFLogxK

U2 - 10.1007/s11999-013-3277-z

DO - 10.1007/s11999-013-3277-z

M3 - Article

VL - 472

SP - 727

EP - 731

JO - Clinical Orthopaedics and Related Research

JF - Clinical Orthopaedics and Related Research

SN - 0009-921X

IS - 2

ER -