Knee Surg Relat Res.  2016 Mar;28(1):55-61. 10.5792/ksrr.2016.28.1.55.

Radiological Stability after Revision of Infected Total Knee Arthroplasty Using Modular Metal Augments

• Lee KJ
• Bae KC
• Cho CH
• Son ES
• Jung JW

• KMID: 2223085
• DOI: http://doi.org/10.5792/ksrr.2016.28.1.55

Abstract

PURPOSE
To evaluate the radiological stability according to the number of modular augments after revision of infected total knee arthroplasty (TKA).
MATERIALS AND METHODS
Between February 2006 and September 2013, 37 patients (39 knees) followed > or =2 years after revision of infected TKA using modular metal augments for bone defects were reviewed retrospectively. We divided the patients into 3 groups according to the number of augments into group A (< or =2 augments, 14 knees), group B (3-4 augments, 18 knees), and group C (5> or = augments, 7 knees) and evaluated the width of radiolucent zones around the implant at the last follow-up.
RESULTS
There were 3 Anderson Orthopedic Research Institute type I, 33 type II, and 3 type III bone defects. The mean number of radiolucent zones of group A was 3 and the sum of width averaged 4.4 mm. In group B, the values were 4.8 and 6.2 mm, respectively. In group C, the values were 8.1 and 12.9 mm, respectively. The differences between the three groups were statistically significant.
CONCLUSIONS
In revision TKA with modular metal augmentation caused by infected TKA, increased modularity can result in radiological instability.

Keyword

Knee; Revision arthroplasty; Modular metal augmentation; Radiologic stability

MeSH Terms

Academies and Institutes
Arthroplasty*
Follow-Up Studies
Humans
Knee*
Orthopedics
Retrospective Studies