Clinical Orthopaedics and Related Research®

, Volume 470, Issue 1, pp 77–83 | Cite as

Lateral Unicompartmental Knee Arthroplasty Through a Lateral Parapatellar Approach Has High Early Survivorship

  • Keith R. Berend
  • Michael C. KolczunII
  • Joseph W. GeorgeJr
  • Adolph V. LombardiJr
Symposium: Papers Presented at the Annual Meetings of The Knee Society

Abstract

Background

The literature suggests lateral unicompartmental knee arthroplasties are associated with low revision rates. However, there are fewer reports describing techniques for lateral unicompartmental arthroplasty and whether technique influences ROM and function compared to reports for medial unicompartmental arthroplasty.

Questions/purposes

We report our indications for lateral unicompartmental arthroplasty, how we perform this procedure, and the subsequent Knee Society scores, ROM, and revision and reoperation rates.

Patients and Methods

From a retrospective review of electronic records from 2004 through 2008, we identified 93 patients who had 100 lateral unicompartmental arthroplasties. Indications were complete lateral bone-on-bone arthrosis with a correctible deformity and maintenance of the medial joint space on varus stress radiographs or isolated lateral disease by diagnostic arthroscopy. Average age was 68 years. Seventy percent of patients were women. At followup, we obtained Knee Society scores and ROM. Minimum followup was 24 months (average, 39 months; range, 24–81 months).

Results

At followup, Knee Society scores averaged 46 for pain, 94 for clinical, and 89 for function, and ROM averaged 124°. Three patients had reoperations: one an open reduction and internal fixation for fracture at 2 years postoperatively, one an arthroscopy for a medial meniscal tear, and one a revision for pain.

Conclusions

Based on our observations, we believe complete cartilage loss laterally and correctible deformity with maintenance of the medial joint on varus stress radiographs are reasonable indications for lateral unicompartmental arthroplasty. We recommend a lateral parapatellar approach can be utilized. The early reoperation and revision rates were low.

Level of Evidence

Level IV, therapeutic study. See the Guidelines for Authors for a complete description of levels of evidence.

Notes

Acknowledgment

The authors thank Michael Sneller for his help with patient followup.

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Copyright information

© The Association of Bone and Joint Surgeons® 2011

Authors and Affiliations

  • Keith R. Berend
    • 1
    • 2
    • 3
  • Michael C. KolczunII
    • 4
    • 5
  • Joseph W. GeorgeJr
    • 4
    • 5
  • Adolph V. LombardiJr
    • 1
    • 2
    • 3
    • 6
  1. 1.Department of OrthopaedicsOhio State UniversityColumbusUSA
  2. 2.Mount Carmel Health SystemNew AlbanyUSA
  3. 3.Joint Implant Surgeons IncNew AlbanyUSA
  4. 4.Kolczun and Kolczun Orthopaedic AssociatesLorainUSA
  5. 5.Cleveland Clinic FoundationLorainUSA
  6. 6.Department of Biomedical EngineeringOhio State UniversityColumbusUSA

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