Clinical Orthopaedics and Related Research®

, Volume 472, Issue 4, pp 1146–1154 | Cite as

Ultrastructure and Innervation of Thumb Carpometacarpal Ligaments in Surgical Patients With Osteoarthritis

  • Nathalie Mobargha
  • Cassie Ludwig
  • Amy L. Ladd
  • Elisabet Hagert
Symposium: Thumb Carpometacarpal Arthritis

Abstract

Background

The complex configuration of the thumb carpometacarpal (CMC-1) joint relies on musculotendinous and ligamentous support for precise circumduction. Ligament innervation contributes to joint stability and proprioception. Evidence suggests abnormal ligament innervation is associated with osteoarthritis (OA) in large joints; however, little is known about CMC-1 ligament innervation characteristics in patients with OA. We studied the dorsal radial ligament (DRL) and the anterior oblique ligament (AOL), ligaments with a reported divergent presence of mechanoreceptors in nonosteoarthritic joints.

Questions/purposes

This study’s purposes were (1) to examine the ultrastructural architecture of CMC-1 ligaments in surgical patients with OA; (2) to describe innervation, specifically looking at mechanoreceptors, of these ligaments using immunohistochemical techniques and compare the AOL and DRL in terms of innervation; and (3) to determine whether there is a correlation between age and mechanoreceptor density.

Methods

The AOL and DRL were harvested from 11 patients with OA during trapeziectomy (10 women, one man; mean age, 67 years). The 22 ligaments were sectioned in paraffin and analyzed using immunoflourescent triple staining microscopy.

Results

In contrast to the organized collagen bundles of the DRL, the AOL appeared to be composed of disorganized connective tissue with few collagen fibers and little innervation. Mechanoreceptors were identified in CMC-1 ligaments of all patients with OA. The DRL was significantly more innervated than the AOL. There was no significant correlation between innervation of the DRL and AOL and patient age.

Conclusions

The dense collagen structure and rich innervation of the DRL in patients with OA suggest that the DRL has an important proprioceptive and stabilizing role.

Clinical Relevance

Ligament innervation may correlate with proprioceptive and neuromuscular changes in OA pathophysiology and consequently support further investigation of innervation in disease prevention and treatment strategies.

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Copyright information

© The Association of Bone and Joint Surgeons® 2013

Authors and Affiliations

  • Nathalie Mobargha
    • 1
  • Cassie Ludwig
    • 2
  • Amy L. Ladd
    • 3
  • Elisabet Hagert
    • 1
    • 4
  1. 1.Department of Clinical Science and EducationKarolinska InstituteStockholmSweden
  2. 2.Department of Orthopaedic Surgery, Stanford University School of MedicineStanford UniversityStanfordUSA
  3. 3.Department of Orthopaedic Surgery, Robert A. Chase Hand & Upper Limb CenterStanford UniversityStanfordUSA
  4. 4.Hand & Foot Surgery CenterStockholmSweden

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