This Article
Right arrow Full Text
Right arrow Full Text (PDF)
Right arrow CME: Take the activity for this article:
 Foot/Ankle Test 5: Foot/Ankle February 2005
Right arrow Letters to the Editor: Submit a response
Right arrow Alert me when this article is cited
Right arrow Alert me when Letters to the Editor are posted
Right arrow Alert me if a correction is posted
Services
Right arrow E-mail this article to a friend
Right arrow Similar articles in this journal
Right arrow Similar articles in PubMed
Right arrow Alert me to new issues of the journal
Right arrow Add to My File Cabinet
Right arrow Download to citation manager
Right arrow Rights and Permissions
Citing Articles
Right arrow Citing Articles via HighWire
Right arrow Citing Articles via Google Scholar
Google Scholar
Right arrow Articles by Grebing, B. R.
Right arrow Articles by Coughlin, M. J.
Right arrow Search for Related Content
PubMed
Right arrow PubMed Citation
Right arrow Articles by Grebing, B. R.
Right arrow Articles by Coughlin, M. J.
Related Collections
Right arrow Foot/Ankle
Social Bookmarking
Add to CiteULike   Add to Connotea   Add to Del.icio.us   Add to Facebook   Add to Technorati   Add to Twitter  
What's this?
The Journal of Bone and Joint Surgery (American) 86:1375-1386 (2004)
© 2004 The Journal of Bone and Joint Surgery, Inc.

Evaluation of Morton's Theory of Second Metatarsal Hypertrophy

Brett R. Grebing, MD1 and Michael J. Coughlin, MD2

1 180 South Third Street, Suite 100, Belleville, IL 62220. E-mail address: grebingbr{at}yahoo.com
2 901 North Curtis Road, Suite 503, Boise, ID 83706. E-mail address: footmd{at}aol.com

Investigation performed at Treasure Valley Hospital, Boise, Idaho

The authors did not receive grants or outside funding in support of their research or preparation of this manuscript. They did not receive payments or other benefits or a commitment or agreement to provide such benefits from a commercial entity. No commercial entity paid or directed, or agreed to pay or direct, any benefits to any research fund, foundation, educational institution, or other charitable or nonprofit organization with which the authors are affiliated or associated.

Background: Originally introduced by Morton, the concept of hypertrophy of the medial cortex and the entire shaft of the second metatarsal as an objective sign of increased mobility of the first ray has not been subjected to much scrutiny. The goal of the current study was to assess the clinical relevance and reliability of radiographic measures of hypertrophy of the second metatarsal in relation to mobility of the first ray, pes planus, and tightness of the gastrocnemiussoleus in both control subjects and patients with diagnosed disorders of the forefoot.

Methods: Four study groups of forty-three subjects each were evaluated. The cohort included an asymptomatic control group as well as three groups made up of patients with symptoms and a diagnosis of hallux valgus, hallux rigidus, or interdigital neuroma. Mobility of the first ray (as measured with a device and method described by Klaue et al.), arch height, and ankle dorsiflexion were measured on physical examination. Plain weight-bearing radiographs and previously established equations were used to determine hypertrophy and the length of the second metatarsal, and the hallux valgus and first-second intermetatarsal angles were measured on plain radiographs as well.

Results: There was no significant difference between the control and symptomatic groups with regard to the values for hypertrophy of the second metatarsal. The patients with hallux valgus deformity had significantly greater mobility of the first ray (p < 0.001) compared with the controls. No correlation was found between values for hypertrophy of the second metatarsal and mobility of the first ray, the length of the first metatarsal, pes planus, or restricted ankle dorsiflexion. No correlation was found between mobility of the first ray and either pes planus or restricted ankle dorsiflexion. A weak correlation (r = 0.4) was noted between increased mobility of the first ray and the hallux valgus angle.

Conclusions: Our findings do not support Morton's concept that medial cortical hypertrophy and increased shaft width of the second metatarsal are associated with increased mobility of the first ray or relative shortness of the first metatarsal. In addition, hypertrophy of the second metatarsal was not associated with either pes planus or restricted ankle dorsiflexion. We found the practice of using hypertrophy of the second metatarsal as an indicator of mobility of the first ray to be unreliable, and thus we consider it to be an inappropriate indication for arthrodesis of the first metatarsocuneiform joint in the treatment of hallux valgus deformity.

Level of Evidence: Diagnostic study, Level IV-1 (case-control study). See Instructions to Authors for a complete description of levels of evidence.


Add to CiteULike CiteULike   Add to Connotea Connotea   Add to Del.icio.us Del.icio.us   Add to Facebook Facebook   Add to Technorati Technorati   Add to Twitter Twitter    What's this?


This article has been cited by other articles:


Home page
 JBJSHome page
M. J. Coughlin and C. P. Jones
Hallux Valgus and First Ray Mobility. A Prospective Study
J. Bone Joint Surg. Am., September 1, 2007; 89(9): 1887 - 1898.
[Abstract] [Full Text] [PDF]

Home page
 JBJSHome page
W. Chao and M. S. Mizel
What's New in Foot and Ankle Surgery
J. Bone Joint Surg. Am., April 1, 2006; 88(4): 909 - 922.
[Full Text] [PDF]