title: Simulation of altered excursion of the pronator quadratus.
abstract: Background Loss of forearm rotation is frequently seen after healing of distal radius fractures. Questions/Purposes Our purpose was to determine whether restricted excursion of the pronator quadratus muscle can affect forearm rotation. Methods We evaluated the relationship between pronator quadratus excursion and forearm rotation in a cadaveric model. Eight adult fresh-frozen above-elbow specimens were attached to a mounting device that permitted free rotation of the forearm around its ulnar axis. Forearm rotation was measured with a protractor while alternating pronation and supination loads were applied. Measurements were repeated after restricting the excursion of pronator quadratus by 10, 20, and 30% of its initial length. Results There was a mean 15° loss of supination for each 10% reduction in pronator excursion. There was no significant effect on pronation. Conclusions We conclude that, independent of any bone deformity or nearby joint stiffness, posttraumatic scarring of this muscle may result in a loss of supination.
authors.affiliation: Department Orthopaedics United Lincolnshire Hospitals, Greetwell Road, Lincolnshire, England, United Kingdom.
authors.forename: Micheal S
authors.initials: MS
authors.lastname: Feeney
authors.affiliation: Zimmer, Inc., Warsaw, Indiana.
authors.forename: Fred
authors.initials: F
authors.lastname: Wentorf
authors.affiliation: Department of Orthopaedic Surgery, University of Minnesota, Minneapolis, Minnesota.
authors.forename: Matthew D
authors.initials: MD
authors.lastname: Putnam
keywords: complications of distal radius fracture; distal radius fractures; forearm rotation; fracture; pronator quadratus; volar approach to ORIF of distal radius
references.citation: J Bone Joint Surg Am. 1981 Jul;63(6):872-7
references.pmid: 7240327
references.citation: J Hand Surg Am. 1996 Jan;21(1):40-7
references.pmid: 8775194
references.citation: J Bone Joint Surg Am. 1980;62(4):613-9
references.pmid: 6155380
references.citation: Acta Orthop Scand. 1988 Feb;59(1):39-42
references.pmid: 3354321
references.citation: J Hand Surg Am. 1981 May;6(3):209-19
references.pmid: 7240676
references.citation: Injury. 2007 Oct;38(10):1139-45
references.pmid: 17880969
references.citation: Tech Hand Up Extrem Surg. 1999 Mar;3(1):13-22
references.pmid: 16609451
references.citation: Hand Clin. 2001 Feb;17(1):111-22, vii
references.pmid: 11280154
references.citation: J Hand Surg Am. 1999 Sep;24(5):1091-6
references.pmid: 10509290
references.citation: J Hand Surg Br. 1996 Dec;21(6):714-22
references.pmid: 8982912
references.citation: J Hand Surg Am. 1998 Jul;23(4):588-99
references.pmid: 9708371
references.citation: J Hand Surg Br. 2000 Dec;25(6):535-43
references.pmid: 11106514
references.citation: J Hand Surg Br. 1989 Feb;14(1):80-3
references.pmid: 2926229
references.citation: Hand Clin. 2010 May;26(2):245-64
references.pmid: 20494751
references.citation: J Hand Surg Am. 1997 Mar;22(2):258-62
references.pmid: 9195423
references.citation: Clin Orthop Relat Res. 1980 Jan-Feb;(146):175-83
references.pmid: 7371246
references.citation: J Hand Surg Am. 2012 Jul;37(7):1501-7
references.pmid: 22721462
references.citation: J Orthop Trauma. 2013 Mar;27(3):130-3
references.pmid: 22664580
references.citation: Anat Anz. 1984;157(4):311-8
references.pmid: 6529015
references.citation: Orthopedics. 1996 Jul;19(7):601-8
references.pmid: 8823819