Abstract
Purpose
The purpose of this study was to investigate if the type of approach [medial parapatellar approach (MPA) versus lateral parapatellar approach with tibial tubercle osteotomy (LPA)] influences rotation of femoral and/or tibial component and leg axis in total knee arthroplasty (TKA). It was the hypothesis that MPA leads to an internally rotated tibial TKA component.
Methods
This study included 200 consecutive patients in whom TKA was performed using either a parapatellar medial (n = 162, MPA) or parapatellar lateral approach with tibial tubercle osteotomy (n = 38, LPA). All patients underwent clinical follow-up, standardized radiographs and computed radiography (CT). TKA components’ position and the whole leg axis were assessed on 3D reconstructed CT scans (sagittal, coronal and rotational). Mean values of TKA component position and the whole leg alignment of both groups were compared using a t test. The tibial component was graded as internally rotated (<3° of external rotation (ER)), neutral rotation (equal or between 3° and 6° of ER) and externally rotated (>6° ER). The femoral component was graded as internally rotated [>3° of internal rotation (IR)], neutral rotation (equal or between −3° IR and 3° of ER) and externally rotated (>3° ER).
Results
There was no significant difference in terms of whole leg axis after TKA between both groups (MPA: 0.2° valgus ± 3.4; LPA: 0.0° valgus ± 3.5). Means of tibial component rotation were 2.7° ER ± 6.1 (MPA) and 7.6° ER ± 5.4 (LPA). Patients of group LPA presented a significantly less internally rotated (LPA: 18.4%; MPA: 48.8%) and more externally rotated (LPA: 52.6%; MPA: 22.8%) tibial component (p < 0.001). No significant differences were seen for the femoral component position, tibial valgus/varus and tibial slope.
Conclusion
The type of approach (medial versus lateral) significantly influenced tibial TKA component rotation. It appears that a MPA tends to internally rotate the tibial TKA component and a LPA tends to externally rotate the tibial TKA. The anterior cortex should not be used as landmark for tibial TKA component placement when using the lateral approach with tibial tubercle osteotomy.
Level of Evidence
Retrospective comparative study, Level III.
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Abbreviations
- TKA:
-
Total knee arthroplasty
- LPA:
-
Lateral parapatellar subvastus approach with tibial tubercle osteotomy
- MPA:
-
Medial parapatellar approach
- CT:
-
Computed tomography
- ER:
-
External rotation
- IR:
-
Internal rotation
- EKNZ:
-
Ethikkommission Nordwest- und Zentralschweiz
- VAS:
-
Visual analogue scale
- KSS:
-
Knee society score
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Author contributions
FFS collected and analysed the data and prepared the manuscript. FA carried out the statistical analysis and helped drafting the manuscript. MTH designed the study, helped with the analysis of data and prepared and revised the manuscript. All authors read and approved the final manuscript.
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There was no financial conflict of interest with regards to this study.
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Ethical approval was obtained from the Ethikkommission Nordwest- und Zentralschweiz (EKNZ, Basel). All procedures performed were in accordance with the ethical standards of the institutional and/or national research committee and with the 1964 Declaration of Helsinki and its later amendments or comparable ethical standards.
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Informed consent was obtained from all individual participants included in the study.
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Schiapparelli, FF., Amsler, F. & Hirschmann, M.T. Medial parapatellar approach leads to internal rotation of tibial component in total knee arthroplasty. Knee Surg Sports Traumatol Arthrosc 26, 1564–1570 (2018). https://doi.org/10.1007/s00167-017-4586-7
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DOI: https://doi.org/10.1007/s00167-017-4586-7