Changes of Sagittal and Axial Alignments of Patella after Open- and Closed-Wedge High-Tibial Osteotomy: A Systematic Review and Meta-Analysis

O-Sung Lee; Soyeon Ahn; Yong Seuk Lee

doi:10.1055/s-0037-1605561

The Journal of Knee Surgery, Table of Contents

J Knee Surg 2018; 31(07): 625-634
DOI: 10.1055/s-0037-1605561

Original Article

Thieme Medical Publishers 333 Seventh Avenue, New York, NY 10001, USA.

Changes of Sagittal and Axial Alignments of Patella after Open- and Closed-Wedge High-Tibial Osteotomy: A Systematic Review and Meta-Analysis

O-Sung Lee

¹Division of Orthopaedics, Department of Orthopaedic Surgery, Seoul National University College of Medicine, Bundang Hospital, Gyeonggi-do, Seoul, Republic of Korea

,

Soyeon Ahn

²Division of Statistics, Seoul National University College of Medicine, Seoul, Republic of Korea

,

Yong Seuk Lee

³Department of Orthopedics, Seoul National University Bundang Hospital, Seongnam, Republic of Korea

› Author Affiliations

Abstract

The present systematic review and meta-analysis were aimed to verify the effect of open-wedge (OW) and closed-wedge (CW) high-tibial osteotomy (HTO) on sagittal and axial alignments of the patella. A vigorous search was performed for studies that compared the changes of sagittal and axial alignments of patella after OW and CW HTO. After evaluating publication bias and heterogeneity, we aggregated variables by using the random-effects model. The weighted mean differences in sagittal and axial alignment of patella were estimated with 95% confidence intervals. Also, we analyzed the changes in sagittal alignment of various OW HTO techniques, such as uniplanar, biplanar, and retrotubercle osteotomy. Overall, 20 studies that included 831 OW HTOs and 206 CW HTOs were included in this study. Patellar height decreased after OW HTO based on the Blackburne–Peel index (BPI, mean: −0.10), and Caton–Deschamps index (CDI, mean: −0.08). However, the patellar height after CW HTO showed no change after surgery (BPI [mean: −0.02], and CDI [mean: 0.02]). Among OW HTO techniques, the retrotubercle osteotomy showed the least change in patellar height after surgery. The lateral patellar tilt decreased by 1.74 degrees, and lateral patellar shift showed no change after OW HTO. However, there was a lack of evidence to conclude the change of axial alignment of patella after CW HTO. Our results supported that the sagittal alignment of patella lowered after OW HTO. However, CW HTO maintained the constant sagittal position of the patella. Among OW HTO techniques, the retrotubercle osteotomy had the least effect on the sagittal alignment of the patella. Regarding the axial alignment of the patella, OW HTO resulted in a little change of lateral patellar tilt; however, there was little evidence to confirm the change of the axial alignment of patella after CW HTO.

Keywords

high-tibial osteotomy - closing wedge - opening wedge - patellar height - patellar tilt - meta-analysis

Full Text

References

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