Stemmed tibial revision component alignment: Does an anatomic conflict exist?

Authors:
Kevin M Smith
Kevin M Smith
Louisiana State University
United States
Andrew Moorman
Andrew Moorman
Outpatient Center
Baltimore | United States
Sabir K Ismaily
Sabir K Ismaily
Institute of Orthopedic Research and Education
United States
Stephen J Incavo
Stephen J Incavo
Houston Methodist Hospital
Houston | United States

Knee 2016 Dec 29;23(6):996-1001. Epub 2016 Oct 29.

Houston Methodist Orthopedics & Sports Medicine, 6445 Main St., Outpatient Center, Suite 2500, Houston, TX 77030, United States. Electronic address:

Introduction: Obtaining satisfactory coronal plane alignment is important for success in revision total knee arthroplasty (TKA). The study objective was to determine tibial coronal plane alignment after TKA when a tibial stem was used and assess if there was an anatomic conflict in tibial stemmed component alignment.

Materials And Methods: A radiographic review of 88 revision TKA cases was performed. Full length leg radiographs were examined for varus/valgus alignment, defined as greater than or equal to three degrees from neutral 180 degrees, canal or non-canal filling tibial stems, and any native tibial bow.

Results: In tibias with a native valgus alignment of three or more degrees, a canal-filling stem allowed little flexibility to improve final positioning of the tibial stem and resulted in a valgus alignment of the tibial stem in 87.5% of cases, where a canal filling stem was utilized. A non-canal filling stem utilized in native valgus tibias allowed on average a two-degree improvement in tibial alignment and 64.7% of cases resulted in a neutral placement of the tibial stem.

Conclusion: Implanting the tibial component in a desired position is limited by type of stem and the native angulation of the tibia. When anatomic conflict exists between tibial mechanical axis and the intramedullary canal, canal filling stems may compromise coronal alignment.

Download full-text PDF

Source
http://dx.doi.org/10.1016/j.knee.2016.08.009DOI Listing

Still can't find the full text of the article?

We can help you send a request to the authors directly.
December 2016
31 Reads
1.702 Impact Factor

Publication Analysis

Top Keywords

anatomic conflict
12
tibial stem
12
tibial
11
stem utilized
8
non-canal filling
8
valgus alignment
8
plane alignment
8
canal filling
8
filling stem
8
coronal plane
8
native valgus
8
alignment
8
three degrees
8
stem
7
allowed flexibility
4
positioning tibial
4
final positioning
4
improve final
4
stem valgus
4
flexibility improve
4

Similar Publications