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Moderate varus/valgus malalignment after total knee arthroplasty has little effect on knee function or muscle strength 91 patients assessed after 1 year

Stucinskas, Justinas; Robertsson, Otto LU ; Sirka, Aurimas; Lebedev, Aleksej; Wingstrand, Hans LU and Tarasevicius, Sarunas (2015) In Acta Orthopaedica 86(6). p.728-733
Abstract
Background and purpose - Postoperative muscle strength and component alignment are important factors affecting functional results after total knee arthroplasty (TKA). We are not aware of any studies that have investigated the relationship between them. We therefore investigated whether coronal malalignment of the mechanical axis and/or of individual implant components would affect knee muscle strength and function 1 year after TKA surgery. Patients and methods - We included 120 consecutive osteoarthritis (OA) patients admitted for TKA. Preoperative active range of motion (ROM) of the knee, patient age, sex, and BMI were recorded and the Knee Society score (KSS) and knee joint extensor/flexor muscle strength were assessed. At 1-year... (More)
Background and purpose - Postoperative muscle strength and component alignment are important factors affecting functional results after total knee arthroplasty (TKA). We are not aware of any studies that have investigated the relationship between them. We therefore investigated whether coronal malalignment of the mechanical axis and/or of individual implant components would affect knee muscle strength and function 1 year after TKA surgery. Patients and methods - We included 120 consecutive osteoarthritis (OA) patients admitted for TKA. Preoperative active range of motion (ROM) of the knee, patient age, sex, and BMI were recorded and the Knee Society score (KSS) and knee joint extensor/flexor muscle strength were assessed. At 1-year follow-up, the mechanical and coronal component alignment was measured from a postoperative long standing radiograph, and ROM, KSS, and muscle strength measurements were taken in 91 patients. Functional outcome and muscle strength measurements were compared between normally aligned and malaligned TKA groups. Results - 29 of 91 TKAs were malaligned, i.e. they deviated more than 3 degrees from the neutral mechanical axis. 18 femoral components and 15 tibial components were malaligned. Before surgery, the malaligned and normally aligned groups were similar regarding sex distribution, BMI, ROM, KSS, and muscle strength. At the 1-year follow-up, the differences between the groups regarding knee joint function and muscle strength were small, not statistically significant, and barely clinically relevant. Interpretation - Moderate varus/valgus malalignment of the mechanical axis or of individual components has no relevant clinical effect on function or muscle strength 1 year after TKA surgery. (Less)
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author
organization
publishing date
type
Contribution to journal
publication status
published
subject
in
Acta Orthopaedica
volume
86
issue
6
pages
728 - 733
publisher
Taylor & Francis
external identifiers
  • wos:000365484500016
  • scopus:84947488177
ISSN
1745-3682
DOI
10.3109/17453674.2015.1059689
language
English
LU publication?
yes
id
281a588d-a509-43ae-9e4d-d8364de98fea (old id 8525892)
date added to LUP
2016-02-08 07:22:33
date last changed
2017-09-03 04:22:35
@article{281a588d-a509-43ae-9e4d-d8364de98fea,
  abstract     = {Background and purpose - Postoperative muscle strength and component alignment are important factors affecting functional results after total knee arthroplasty (TKA). We are not aware of any studies that have investigated the relationship between them. We therefore investigated whether coronal malalignment of the mechanical axis and/or of individual implant components would affect knee muscle strength and function 1 year after TKA surgery. Patients and methods - We included 120 consecutive osteoarthritis (OA) patients admitted for TKA. Preoperative active range of motion (ROM) of the knee, patient age, sex, and BMI were recorded and the Knee Society score (KSS) and knee joint extensor/flexor muscle strength were assessed. At 1-year follow-up, the mechanical and coronal component alignment was measured from a postoperative long standing radiograph, and ROM, KSS, and muscle strength measurements were taken in 91 patients. Functional outcome and muscle strength measurements were compared between normally aligned and malaligned TKA groups. Results - 29 of 91 TKAs were malaligned, i.e. they deviated more than 3 degrees from the neutral mechanical axis. 18 femoral components and 15 tibial components were malaligned. Before surgery, the malaligned and normally aligned groups were similar regarding sex distribution, BMI, ROM, KSS, and muscle strength. At the 1-year follow-up, the differences between the groups regarding knee joint function and muscle strength were small, not statistically significant, and barely clinically relevant. Interpretation - Moderate varus/valgus malalignment of the mechanical axis or of individual components has no relevant clinical effect on function or muscle strength 1 year after TKA surgery.},
  author       = {Stucinskas, Justinas and Robertsson, Otto and Sirka, Aurimas and Lebedev, Aleksej and Wingstrand, Hans and Tarasevicius, Sarunas},
  issn         = {1745-3682},
  language     = {eng},
  number       = {6},
  pages        = {728--733},
  publisher    = {Taylor & Francis},
  series       = {Acta Orthopaedica},
  title        = {Moderate varus/valgus malalignment after total knee arthroplasty has little effect on knee function or muscle strength 91 patients assessed after 1 year},
  url          = {http://dx.doi.org/10.3109/17453674.2015.1059689},
  volume       = {86},
  year         = {2015},
}