The contribution of the coronoid and radial head to the stability of the elbow

I. H. Jeon, J. Sanchez-Sotelo, K. Zhao, K. N. An, B. M. Morrey

Research output: Contribution to journalArticlepeer-review

41 Scopus citations


We undertook this study to determine the minimum amount of coronoid necessary to stabilise an otherwise intact elbow joint. Regan-Morrey types II and III, plus medial and lateral oblique coronoid fractures, collectively termed type IV fractures, were simulated in nine fresh cadavers. An electromagnetic tracking system defined the three-dimensional stability of the ulna relative to the humerus. The coronoid surface area accounts for 59% of the anterior articulation. Alteration in valgus, internal and external rotation occurred only with a type III coronoid fracture, accounting for 68% of the coronoid and 40% of the entire articular surface. A type II fracture removed 42% of the coronoid articulation and 25% of the entire articular surface but was associated with valgus and external rotational changes only when the radial head was removed, thereby removing 67% of the articular surface. We conclude that all type III fractures, as defined here, are unstable, even with intact ligaments and a radial head. However, a type II deficiency is stable unless the radial head is removed. Our study suggests that isolated medial-oblique or lateral-oblique fractures, and even a type II fracture with intact ligaments and a functional radial head, can be clinically stable, which is consistent with clinical observation.

Original languageEnglish (US)
Pages (from-to)86-92
Number of pages7
JournalJournal of Bone and Joint Surgery - Series B
Volume94 B
Issue number1
StatePublished - Jan 2012

ASJC Scopus subject areas

  • Surgery
  • Orthopedics and Sports Medicine


Dive into the research topics of 'The contribution of the coronoid and radial head to the stability of the elbow'. Together they form a unique fingerprint.

Cite this