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Clinical Orthopaedics and Related Research®

, Volume 471, Issue 12, pp 3998–4003 | Cite as

The Value of Valgus Stress Radiographs in the Workup for Medial Unicompartmental Arthritis

  • Wenzel Waldstein
  • Jad Bou Monsef
  • Johannes Buckup
  • Friedrich BoettnerEmail author
Clinical Research

Abstract

Background

High tibial osteotomy and unicompartmental knee arthroplasty are surgical treatment options for unicompartmental knee arthritis; these procedures are indicated for patients who do not have severe arthritis in the lateral compartment. Valgus stress radiographs sometimes are used to make this evaluation, but this test has not been critically evaluated.

Questions/purposes

We sought to determine (1) whether valgus stress radiographs help to evaluate the integrity of the cartilage in the lateral compartment in patients undergoing TKA for noninflammatory arthritis, and (2) whether valgus stress radiographs can identify patients whose varus deformity is correctable.

Methods

We reviewed preoperative hip-to-ankle standing radiographs, AP standing radiographs, and valgus stress radiographs of 84 patients (91 knees) who underwent TKA for varus knee arthritis between July 2010 and January 2012. Valgus stress radiographs were obtained with the patient supine with the knee 20° flexed and a firm manual valgus force was applied through the knee. On valgus stress radiographs, the lateral compartment joint space width and the corrected mechanical alignment were measured. Intraoperative cartilage assessment (Outerbridge grade) was compared with lateral compartment joint space width. Knees with mechanical leg alignment of 3° varus to 3° valgus on valgus stress radiographs were considered correctable deformities.

Results

The lateral compartment joint space width on valgus stress radiographs did not correlate with the intraoperative Outerbridge grading of the lateral compartment cartilage (rs = −0.154; p = 0.146). The majority of knees (93%; 55 of 59) with 10° or less mechanical varus on hip-to-ankle standing radiographs were correctable within the range of 3° varus to 3° valgus.

Conclusions

Valgus stress radiographs provided no added benefit to the radiographic assessment of the lateral compartment cartilage and regarding the correctability of the varus deformity.

Level of Evidence

Level III, diagnostic study. See the Instructions for Authors for a complete description of levels of evidence.

Keywords

High Tibial Osteotomy Lateral Compartment Unicompartmental Knee Arthroplasty Joint Space Width Varus Deformity 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.

Notes

Acknowledgments

We thank Michelle Perna BS and Danielle Perkins PA-C for assistance with the data collection.

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Copyright information

© The Association of Bone and Joint Surgeons® 2013

Authors and Affiliations

  • Wenzel Waldstein
    • 1
  • Jad Bou Monsef
    • 1
  • Johannes Buckup
    • 1
  • Friedrich Boettner
    • 1
    Email author
  1. 1.Adult Reconstruction & Joint Replacement DivisionHospital for Special SurgeryNew YorkUSA

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