Kinematics and laxity of ulnohumeral joint under valgus-varus stress

Shinji Tanaka, Kai Nan An, Bernard F. Morrey

Research output: Contribution to journalArticlepeer-review

33 Scopus citations


Three-dimensional kinematics of the ulnohumeral joint under simulated active elbow joint flexion-extension was obtained by using an electromagnetic tracking device. The joint motion was analyzed based on Eulerian angle description. In order to minimize the effect of "downstream cross-talk" on calculation of the three Eulerian angles, an optimal axis to best represent flexion-extension of the elbow joint was established. This axis, on average, is close to the line joining the centers of the capitellum and the trochlear groove. Furthermore, joint laxity under valgus-varus stress was also examined. With the weight of the forearm as the stress, maximums of 7.6° valgus-varus laxity and 5.3° axial rotation laxity were observed within a range of elbow flexion. The results of this study provide useful baseline information on joint laxity for the evaluation of elbow joints with implant replacements and other surgical treatment modalities.

Original languageEnglish (US)
Pages (from-to)45-54
Number of pages10
JournalJournal of Musculoskeletal Research
Issue number1
StatePublished - Mar 1998

ASJC Scopus subject areas

  • Orthopedics and Sports Medicine


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