Abstract
Purpose
Numerous studies demonstrated that prosthetic overhang and over-sizing cause pain and stiffness following total knee arthroplasty (TKA), but none considered volume changes within the joint capsule. This study was designed to investigate differences in volumes of resected bone compared to implanted components in TKA, and to determine the incidence and factors related to ‘over-voluming’.
Methods
Three-dimensional reconstructions were created from 100 magnetic resonance imaging scans taken to design patient-specific instruments for TKA. The preoperative simulations were used to calculate the volume ratio (VR) by dividing volume of planned components by that of planned bone resections. Uni- and multi-variable linear regressions were performed to determine associations between ‘over-voluming’ (VR > 1.0) and gender, implant size and version (standard versus narrow), osteophytes, resection levels, external rotation of the femoral component, hip–knee–ankle (HKA) angle, mechanical lateral distal femoral angle (mLDFA), and mechanical medial proximal tibial angle (mMPTA).
Results
The overall implant/bone volume ratio was 0.91 ± 0.11 (range 0.63–1.16) with ‘over-voluming’ observed in 24 knees. Multi-variable regression confirmed over-voluming to be associated with lower mLDFA (OR 0.66; CI 0.45–0.93; p = 0.026) and extensive osteophytes (OR 0.14; CI 0.03–0.61; p = 0.014), but not HKA angle (OR 0.98; CI 0.76–1.26; p = n.s.).
Conclusions
Over-voluming was observed in 24% of knees, in which the implant volume exceeded the resected volume by up to 16%. Over-voluming was associated with intra-articular femoral valgus (low mLDFA), but not directly associated with tibial deformity (mMPTA) or HKA angle. Over-voluming could be associated with prosthetic overhang or excessive tensions within the joint capsule, and, therefore, contribute to unexplained pain and stiffness following TKA.
Level of evidence
IV, Retrospective cohort study.
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Acknowledgements
The authors are grateful to Mr. Toufik Zakaria for his assistance with data collection and interpretation of findings, to Ms. Marine Rachail for assistance with the preliminary statistical analyses, to Mr. Luca Nover for performing the final statistical analyses, and to Mr. Antoine Barnaud for producing illustrations (Fig. 5).
Funding
This study was funded by Corin-Tornier SAS (Montbonnont, France).
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SM participated in study design, data collection, and manuscript editing. ER participated in study design, data collection, and manuscript editing. JV participated in literature review, statistical analysis, and manuscript writing. MS participated in statistical analysis and manuscript writing. All authors read and approved the final manuscript.
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SM received fees for consulting and education from Corin-Tornier (France) and DePuy Synthes (France). ER is employee of Employee of Corin-Tornier (France). JV and MS received fees for support in study design and manuscript preparation from ReSurg SA (Switzerland).
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All procedures performed in studies involving human participants were in accordance with the ethical standards of the institutional and/or national research committee and with the 1964 Helsinki declaration and its later amendments or comparable ethical standards.
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Marmor, S., Renault, E., Valluy, J. et al. Over-voluming predicted by pre-operative planning in 24% of total knee arthroplasty. Knee Surg Sports Traumatol Arthrosc 27, 1544–1551 (2019). https://doi.org/10.1007/s00167-018-4998-z
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DOI: https://doi.org/10.1007/s00167-018-4998-z