J Wrist Surg 2017; 06(03): 188-193
DOI: 10.1055/s-0036-1597836
Scientific Article
Thieme Medical Publishers 333 Seventh Avenue, New York, NY 10001, USA.

The Effect of Metacarpophalangeal Joint Hyperextension on Outcomes in the Surgical Treatment of Carpometacarpal Joint Arthritis

David M. Brogan
1   Department of Orthopaedic Surgery, University of Missouri, Columbia, Missouri
,
Rose M. van Hogezand
2   Department of Orthopaedic Surgery, Mayo Clinic, Rochester, Minnesota
,
Nikola Babovic
2   Department of Orthopaedic Surgery, Mayo Clinic, Rochester, Minnesota
,
Brian Carlsen
2   Department of Orthopaedic Surgery, Mayo Clinic, Rochester, Minnesota
,
Sanjeev Kakar
2   Department of Orthopaedic Surgery, Mayo Clinic, Rochester, Minnesota
› Author Affiliations
Further Information

Publication History

14 October 2016

25 November 2016

Publication Date:
28 December 2016 (online)

Abstract

Purpose In the surgical treatment of thumb carpometacarpal (CMC) joint arthritis, the effect of mild preoperative metacarpophalangeal (MCP) hyperextension on postoperative functional outcomes is unknown. We sought to examine outcomes after surgical treatment of CMC arthritis in patients with and without mild preexisting MCP deformity.

Methods A retrospective review was conducted to analyze the functional outcomes of patients treated for CMC arthritis at a single institution from March 1998 to May 2009. All patients were treated with one of two standard CMC arthroplasty procedures—either ligament reconstruction tendon interposition (LRTI) or a Weilby procedure—and none had additional procedures to address MCP hyperextension. Pre- and postoperative assessments included pinch and grip strength, degree of MCP hyperextension, and thumb radial and palmar abduction. A t-test was used to assume unequal variances.

Results A total of 203 patients were followed for an average of 27.3 months. Patients were divided into two groups: (1) patients without preoperative MCP hyperextension (167 patients) and (2) patients with mild but untreated preoperative MCP hyperextension (≤ 30 degrees; 36 patients). All patients underwent either a Weilby procedure (118 patients) or an LRTI; 85 patients). The main difference between techniques was the use of the abductor pollicis longus tendon as a post to secure the flexor carpi radialis (Weilby) or the use of a bone tunnel in the first metacarpal (LRTI). Analysis of the preoperative data showed no difference in the baseline parameters among both the groups, with the exception of MCP hyperextension. Postoperatively, neither the type of CMC procedure nor the presence of MCP hyperextension demonstrated any significant differences in key pinch, tip pinch, grip strength, and radial or palmar abduction of the thumb between the groups.

Conclusion There were no statistically significant differences in improvement of functional outcomes after surgery when comparing patients without preoperative MCP hyperextension to patients with untreated MCP hyperextension of less than 30 degrees.

Level of Evidence Level III, retrospective comparative study.

Note

There was no form of financial support relating to this submission, including pharmaceutical company support, nor any commercial or financial involvements that might present an appearance of a conflict of interest related to the submission, nor any agreement with any sponsor of the research reported in the contribution that prevents the authors publishing both positive and negative results or that forbids the authors from publishing this research without the prior approval of the sponsor.


 
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