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Conference Paper: Joint line restoration and alignment after conventional versus robotic unicompartmental knee arthroplasty
Title | Joint line restoration and alignment after conventional versus robotic unicompartmental knee arthroplasty |
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Authors | |
Issue Date | 2018 |
Publisher | Hong Kong Orthopaedic Association. |
Citation | Hong Kong Orthopaedic Association (HKOA) 38th Annual Congress, Hong Kong, 3-4 November 2018, p. 40-41 How to Cite? |
Abstract | Introduction: Robotic technique improves accuracy of unicompartmental knee replacement. This study aims to directly compare the CT-based robotic, imagefree robotic and conventional techniques in relation to coronal alignment, joint line restoration and posterior slope.
Methodology: This retrospective case control study compared 175 unicompartmental knee arthroplasties performed using conventional spacer block technique (n=52), imagefree robotic system (Navio) (n=57) or CT based robotic system (Mako) (n=66) by a single surgeon between May 2012 and May 2018. Preoperative and postoperative short films were measured for anatomical axis, joint line height and posterior slope.
Results and Analysis: There were no significant differences between the groups for age, BMI, laterality, preoperative anatomical axis or slope. The mean post operative posterior slope was highest in the conventional group (5.58˚+/-2.72), followed by Mako (3.59˚ +/- 2.02), with Navio being the smallest (2.45˚+/-2.36). The differences between groups were all statistically significant. If >7˚ was considered an outlier, the percentage of outliers were 25%, 3.5% and 5% for conventional, Navio and Mako respectively. Postoperative mean anatomical axes were 1.49˚+/-2.75 valgus for conventional, 1.25˚+/-2.61 valgus for Navio and 0.27˚+/-2.93 for Mako. Mako produced less overcorrection when compared to conventional (p=0.023) but was not significant compared to Navio(p=0.053). The joint line was significantly lower in conventional (-1.57mm+/-1.62) when compared with Navio (-0.3mm+/-1.06) (p<;0.001) or Mako (-0.26mm+/-0.98)(p<0.001). There were no significant differences between Navio and Mako (p=0.65).
Discussion and Conclusion: Both robotic systems produced less outliers in posterior slope, less joint line depression and less overcorrection. All these factors may reduce lateral arthritis progression and improve implant survivorship. |
Description | Free Paper Session IX: Adult Joint Reconstruction II - no. 9.6 |
Persistent Identifier | http://hdl.handle.net/10722/277827 |
DC Field | Value | Language |
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dc.contributor.author | Fu, CHH | - |
dc.contributor.author | Manrique, J | - |
dc.contributor.author | Yan, CH | - |
dc.contributor.author | Chiu, PKY | - |
dc.contributor.author | Lonner, JH | - |
dc.date.accessioned | 2019-10-04T08:02:09Z | - |
dc.date.available | 2019-10-04T08:02:09Z | - |
dc.date.issued | 2018 | - |
dc.identifier.citation | Hong Kong Orthopaedic Association (HKOA) 38th Annual Congress, Hong Kong, 3-4 November 2018, p. 40-41 | - |
dc.identifier.uri | http://hdl.handle.net/10722/277827 | - |
dc.description | Free Paper Session IX: Adult Joint Reconstruction II - no. 9.6 | - |
dc.description.abstract | Introduction: Robotic technique improves accuracy of unicompartmental knee replacement. This study aims to directly compare the CT-based robotic, imagefree robotic and conventional techniques in relation to coronal alignment, joint line restoration and posterior slope. Methodology: This retrospective case control study compared 175 unicompartmental knee arthroplasties performed using conventional spacer block technique (n=52), imagefree robotic system (Navio) (n=57) or CT based robotic system (Mako) (n=66) by a single surgeon between May 2012 and May 2018. Preoperative and postoperative short films were measured for anatomical axis, joint line height and posterior slope. Results and Analysis: There were no significant differences between the groups for age, BMI, laterality, preoperative anatomical axis or slope. The mean post operative posterior slope was highest in the conventional group (5.58˚+/-2.72), followed by Mako (3.59˚ +/- 2.02), with Navio being the smallest (2.45˚+/-2.36). The differences between groups were all statistically significant. If >7˚ was considered an outlier, the percentage of outliers were 25%, 3.5% and 5% for conventional, Navio and Mako respectively. Postoperative mean anatomical axes were 1.49˚+/-2.75 valgus for conventional, 1.25˚+/-2.61 valgus for Navio and 0.27˚+/-2.93 for Mako. Mako produced less overcorrection when compared to conventional (p=0.023) but was not significant compared to Navio(p=0.053). The joint line was significantly lower in conventional (-1.57mm+/-1.62) when compared with Navio (-0.3mm+/-1.06) (p<;0.001) or Mako (-0.26mm+/-0.98)(p<0.001). There were no significant differences between Navio and Mako (p=0.65). Discussion and Conclusion: Both robotic systems produced less outliers in posterior slope, less joint line depression and less overcorrection. All these factors may reduce lateral arthritis progression and improve implant survivorship. | - |
dc.language | eng | - |
dc.publisher | Hong Kong Orthopaedic Association. | - |
dc.relation.ispartof | 38th Hong Kong Orthopaedic Association Annual Congress, 2018 | - |
dc.rights | 38th Hong Kong Orthopaedic Association Annual Congress, 2018. Copyright © Hong Kong Orthopaedic Association. | - |
dc.title | Joint line restoration and alignment after conventional versus robotic unicompartmental knee arthroplasty | - |
dc.type | Conference_Paper | - |
dc.identifier.email | Fu, CHH: drhfu@hku.hk | - |
dc.identifier.email | Yan, CH: yanchoi@hku.hk | - |
dc.identifier.email | Chiu, PKY: pkychiu@hkucc.hku.hk | - |
dc.identifier.authority | Yan, CH=rp00303 | - |
dc.identifier.authority | Chiu, PKY=rp00379 | - |
dc.identifier.hkuros | 307085 | - |
dc.identifier.spage | 40 | - |
dc.identifier.epage | 41 | - |
dc.publisher.place | Hong Kong | - |