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Vendittoli PA, Beckers G, Massé V, de Grave PW, Ganapathi M, MacDessi SJ. Why we should use boundaries for personalised knee arthroplasty and the lack of evidence for unrestricted kinematic alignment. Knee Surg Sports Traumatol Arthrosc 2024; 32:1917-1922. [PMID: 38804654 DOI: 10.1002/ksa.12266] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 04/09/2024] [Revised: 05/02/2024] [Accepted: 05/05/2024] [Indexed: 05/29/2024]
Affiliation(s)
- Pascal-André Vendittoli
- Department of Orthopaedic Surgery, Hôpital Maisonneuve-Rosemont, Université de Montréal, Montreal, Québec, Canada
- Clinique Orthopédique Duval, Laval, Québec, Canada
- Personalised Arthroplasty Society, Atlanta, Georgia, USA
| | - Gautier Beckers
- Personalised Arthroplasty Society, Atlanta, Georgia, USA
- Department of Orthopaedic Surgery, Klinikum Großhadern, Ludwig-Maximilians-University of Munich, Munich, Germany
| | - Vincent Massé
- Department of Orthopaedic Surgery, Hôpital Maisonneuve-Rosemont, Université de Montréal, Montreal, Québec, Canada
- Clinique Orthopédique Duval, Laval, Québec, Canada
- Personalised Arthroplasty Society, Atlanta, Georgia, USA
| | - Philip Winnock de Grave
- Personalised Arthroplasty Society, Atlanta, Georgia, USA
- Department of Orthopaedic Surgery, AZ Delta Hospital, Roeselare, Belgium
- European Knee Society, Haacht, Belgium
| | - Muthu Ganapathi
- Personalised Arthroplasty Society, Atlanta, Georgia, USA
- Department of Trauma and Orthopaedics, Ysbyty Gwynedd Hospital, Betsi Cadwaladr University Health Board, Penrhosgarnedd, Bangor, UK
| | - Samuel J MacDessi
- School of Clinical Medicine, St George Hospital, University of NSW Medicine and Health, Kogarah, Sydney, Australia
- Sydney Knee Specialists, Kogarah, New South Wales, Australia
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Russell SP, Keyes S, Hirschmann MT, Harty JA. Conventionally instrumented inverse kinematic alignment for total knee arthroplasty: How is it done? J Exp Orthop 2024; 11:e12055. [PMID: 38868128 PMCID: PMC11167404 DOI: 10.1002/jeo2.12055] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 01/09/2024] [Revised: 04/24/2024] [Accepted: 05/10/2024] [Indexed: 06/14/2024] Open
Abstract
Purpose For primary total knee arthroplasty (TKA), there is an increasing trend towards patient-specific alignment strategies such as kinematic alignment (KA) and inverse kinematic alignment (iKA), which by restoring native joint mechanics may yield higher patient satisfaction rates. Second, the most recent Australian joint registry report describes favourable revision rates for conventionally instrumented TKA compared to technology-assisted techniques such as those using navigation, robotics or custom-cutting blocks. The aim of this technique article is to describe in detail a surgical technique for TKA that: (1) utilises the principles of iKA and (2) uses conventionally instrumented guided resections thereby avoiding the use of navigation, robotics or custom blocks. Methods A TKA technique is described, whereby inverse kinematic principles are utilised and patient-specific alignment is achieved. Additionally, the patellofemoral compartment of the knee is restored to the native patellofemoral joint line. The sequenced technical note provided may be utilised for cemented or cementless components; cruciate retaining or sacrificing designs and for fixed or rotating platforms. Results An uncomplicated, robust and reproducible technique for TKA is described. Discussion Knee arthroplasty surgeons may wish to harness the emerging benefits of both a conventionally instrumented technique and a patient-specific alignment strategy. Level of Evidence Level V.
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Affiliation(s)
- Shane P. Russell
- Department of Orthopaedic SurgerySouth Infirmary Victoria University HospitalCorkIreland
- Department of Orthopaedic SurgeryBon Secours Hospital CorkCorkIreland
- Department of Orthopaedic SurgeryUniversity College CorkCorkIreland
- Department of Orthopaedic SurgeryRoyal College of Surgeons in IrelandDublinIreland
| | - Sara Keyes
- Department of Orthopaedic SurgerySouth Infirmary Victoria University HospitalCorkIreland
- Department of Orthopaedic SurgeryBon Secours Hospital CorkCorkIreland
- Department of Orthopaedic SurgeryUniversity College CorkCorkIreland
| | - Michael T. Hirschmann
- Department of Orthopedic Surgery and TraumatologyKantonsspital BasellandBruderholzSwitzerland
- Department of Clinical Research, Research Group Michael T. Hirschmann, Regenerative Medicine & BiomechanicsUniversity of BaselBaselSwitzerland
| | - James A. Harty
- Department of Orthopaedic SurgerySouth Infirmary Victoria University HospitalCorkIreland
- Department of Orthopaedic SurgeryBon Secours Hospital CorkCorkIreland
- Department of Orthopaedic SurgeryUniversity College CorkCorkIreland
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Keyes S, Russell SP, Bertalan Z, Harty JA. Inverse kinematic total knee arthroplasty using conventional instrumentation restores constitutional coronal alignment. Knee Surg Sports Traumatol Arthrosc 2024. [PMID: 38829243 DOI: 10.1002/ksa.12306] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 03/04/2024] [Revised: 05/01/2024] [Accepted: 05/06/2024] [Indexed: 06/05/2024]
Abstract
PURPOSE Restricted inverse kinematic alignment (iKA) is a contemporary alignment strategy for total knee arthroplasty (TKA), commonly performed with robotic assistance. While superior clinical results are reported for kinematic-type alignment strategies, registry data indicate no survivorship benefit for navigation or robotic assistance. This study aimed to determine the efficacy of an instrumented, restricted iKA technique for achieving patient-specific alignment. METHODS Seventy-nine patients undergoing 84 TKAs (five bilateral procedures) using an iKA technique were included for preoperative and postoperative lower limb alignment analysis. The mean age was 66.5 (range: 43-82) with 33 male and 51 female patients. Artificial intelligence was employed for radiographic measurements. Alignment profiles were classified using the Coronal Plane Alignment of the Knee (CPAK) system. Preoperative and postoperative alignment profiles were compared with subanalyses for preoperative valgus, neutral and varus profiles. RESULTS The mean joint-line convergence angle (JLCA) reduced from 2.5° to -0.1° postoperatively. The mean lateral distal femoral angle (LDFA) remained unchanged postoperatively, while the mean medial proximal tibial angle (MPTA) increased by 2.5° (p = 0.001). By preservation of the LDFA and restoration of the MPTA, the mean hip knee ankle angle (HKA) moved through 3.5° varus to 1.2° valgus. The CPAK system was used to visually depict changes in alignment profiles for preoperative valgus, neutral and varus knees; with 63% of patients observing an interval change in classification. CONCLUSION Encouraged by the latest evidence supporting both conventional instrumentation and kinematic-type TKA strategies, this study describes how a restricted, conventionally instrumented iKA technique may be utilised to restore constitutional lower limb alignment. LEVEL OF EVIDENCE Level III.
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Affiliation(s)
- Sarah Keyes
- South Infirmary Victoria University Hospital, Cork, Ireland
- Bon Secours Hospital Cork, Cork, Ireland
- Department of Orthopaedic Surgery, University College Cork, Cork, Ireland
- Royal College of Surgeons in Ireland, Dublin, Ireland
| | - Shane P Russell
- South Infirmary Victoria University Hospital, Cork, Ireland
- Bon Secours Hospital Cork, Cork, Ireland
- Department of Orthopaedic Surgery, University College Cork, Cork, Ireland
- Royal College of Surgeons in Ireland, Dublin, Ireland
| | | | - James A Harty
- South Infirmary Victoria University Hospital, Cork, Ireland
- Bon Secours Hospital Cork, Cork, Ireland
- Department of Orthopaedic Surgery, University College Cork, Cork, Ireland
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Ollivier M, Gulagaci F, Sahbat Y, Kim Y, Ehlinger M. Should I optimize joint line obliquity in my knee procedure? Orthop Traumatol Surg Res 2024; 110:103882. [PMID: 38583703 DOI: 10.1016/j.otsr.2024.103882] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 12/03/2023] [Accepted: 04/02/2024] [Indexed: 04/09/2024]
Affiliation(s)
- Matthieu Ollivier
- Institut du mouvement et de l'appareil locomoteur (IML), hôpital Sainte-Marguerite, AP-HM, 270, boulevard de Sainte-Marguerite, 13009 Marseille, France.
| | - Firat Gulagaci
- Institut du mouvement et de l'appareil locomoteur (IML), hôpital Sainte-Marguerite, AP-HM, 270, boulevard de Sainte-Marguerite, 13009 Marseille, France
| | - Yavuz Sahbat
- Institut du mouvement et de l'appareil locomoteur (IML), hôpital Sainte-Marguerite, AP-HM, 270, boulevard de Sainte-Marguerite, 13009 Marseille, France
| | - Youngji Kim
- Institut du mouvement et de l'appareil locomoteur (IML), hôpital Sainte-Marguerite, AP-HM, 270, boulevard de Sainte-Marguerite, 13009 Marseille, France
| | - Matthieu Ehlinger
- Service de chirurgie orthopédique et de traumatologie du membre inférieur, pôle Locomax, hôpital de Hautepierre II, hôpitaux universitaires de Strasbourg, 1, avenue Molière, 67098 Strasbourg, France
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Graichen H, Avram GM, Strauch M, Kaufmann V, Hirschmann MT. Tibia-first, gap-balanced patient-specific alignment restores bony phenotypes and joint line obliquity in a great majority of varus and straight knees and normalises valgus and severe varus deformities. Knee Surg Sports Traumatol Arthrosc 2024; 32:1287-1297. [PMID: 38504509 DOI: 10.1002/ksa.12145] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 02/08/2024] [Revised: 02/25/2024] [Accepted: 02/28/2024] [Indexed: 03/21/2024]
Abstract
PURPOSE The present study focuses on testing the capability of a restricted tibia-first, gap-balanced patient-specific alignment technique (PSA) to restore bony morphology and phenotypes. METHODS Three-hundred and sixty-seven patients were treated with navigated total knee arthroplasty and tibia-first gap-balanced PSA technique. Boundaries for medial proximal tibial angle were 86°-92°, mechanical lateral distal femoral angle 86°-92°, and hip-knee-ankle angle 175°-183°. Knees were classified by coronal plane alignment of the knee (CPAK), with subsequent analyses comparing pre- and postoperative distributions. Phenotype classification within CPAK groups assessed pre- and postoperative distributions. RESULTS Preoperatively, the largest CPAK group was type II (30.8%), followed by type I (20.5%) and type V (17.8%). Postoperatively, type II remained the largest group (39%), followed by type V (30%). All groups with varus/valgus deformities (I, III, IV and VI) became smaller. While in straight legs (II, IV), the CPAK was restored in more than 70%-75%, in varus groups (I, IV) in 40%-50% and in valgus (III and VI) in 5%-18%. The joint line obliquity remained the same in the majority of knees (straight >75%; varus 63%-80%; valgus VI 95%), with the exception of CPAK III (40%). The phenotype analysis showed for straight legs a phenotype restoration of 85%, for varus 94% and for valgus 37%. Joint line convergence angle was reduced significantly in all groups from 1.8°-4.3° preoperatively to 0.6°-1.2° postoperatively. CONCLUSION PSA restores bony phenotypes and joint line obliquity in the majority of straight and varus knees, while most of the valgus and extreme varus knees are normalised. LEVEL OF EVIDENCE Level III, retrospective cohort study.
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Affiliation(s)
- Heiko Graichen
- Department for Arthroplasty, Sports-Traumatology and General Orthopaedics, Asklepios Orthopaedic Hospital Lindenlohe, Schwandorf, Germany
| | - George Mihai Avram
- Department of Orthopedic Surgery and Traumatology, Kantonsspital Baselland, Bruderholz, Switzerland
- DKF Research Unit, University of Basel, Basel, Switzerland
| | - Marco Strauch
- Department for Arthroplasty, Sports-Traumatology and General Orthopaedics, Asklepios Orthopaedic Hospital Lindenlohe, Schwandorf, Germany
| | - Verena Kaufmann
- Department for Arthroplasty, Sports-Traumatology and General Orthopaedics, Asklepios Orthopaedic Hospital Lindenlohe, Schwandorf, Germany
| | - Michael T Hirschmann
- Department of Orthopedic Surgery and Traumatology, Kantonsspital Baselland, Bruderholz, Switzerland
- DKF Research Unit, University of Basel, Basel, Switzerland
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Genestoux V, Vermorel PH, Neri T, Farizon F, Philippot R. Does inverse kinematic alignment coupled with robot-assisted TKA optimize patellofemoral clinical and radiological results? Orthop Traumatol Surg Res 2024:103880. [PMID: 38582224 DOI: 10.1016/j.otsr.2024.103880] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 04/18/2023] [Revised: 01/16/2024] [Accepted: 01/26/2024] [Indexed: 04/08/2024]
Abstract
INTRODUCTION With a satisfaction rate of 80%, total knee arthroplasty (TKA) surgery has seen significant improvements in recent decades. The 20% of poor results may be explained by the alignment technique used for implant placement, which can influence patellofemoral kinematics. The objective of this study was to demonstrate that the use of inverse kinematic alignment makes it possible to obtain satisfactory clinical and radiological patellar scores in robotic TKA. HYPOTHESIS The inverse kinematic alignment technique coupled with robotic surgery makes it possible to restore the native kinematics of the patella. MATERIALS AND METHODS This prospective study including 100 TKAs with a primary TKA performed using the Stryker Mako™ robotic surgery system, and the inverse kinematic alignment technique. Patients who underwent patella resurfacing were excluded. Clinical and radiological scores were recorded preoperatively and 1 year postoperatively. RESULTS At one year, the specific patellar clinical scores were excellent with an average Kujala score of 85.69 and an average HSS Patellar score 88.15. The average patellar lateralization index was 0.15 and the average patellar tilt was 5.1°, showing no significant difference compared to preoperation (p=0.45 and p=0.18). The average external rotation of the femoral implant was 0.47±0.6° [-1.9; 2.1]. DISCUSSION The patellofemoral clinical results were excellent. The use of the robotic arm coupled with this alignment technique makes it possible to obtain a controlled external rotation of the femoral implant as well as an optimized orientation of the tibial component, favoring good restitution of the alignment of the extensor apparatus. This study did not demonstrate any radiological correction of patellar tilt and lateralization. CONCLUSION The combined use of robotic surgery with the inverse kinematic alignment technique seems effective on specific clinical results of the patellofemoral joint. LEVEL OF EVIDENCE II; prospective cohort.
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Affiliation(s)
| | | | - Thomas Neri
- CHU Nord Saint-Étienne, Saint-Priest-en-Jarez, France
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Ollivier B, Wakelin E, Plaskos C, Vandenneucker H, Luyckx T. Widening of tibial resection boundaries increases the rate of femoral component valgus and internal rotation in functionally aligned TKA. Knee Surg Sports Traumatol Arthrosc 2024; 32:953-962. [PMID: 38444096 DOI: 10.1002/ksa.12118] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 11/01/2023] [Revised: 02/12/2024] [Accepted: 02/15/2024] [Indexed: 03/07/2024]
Abstract
PURPOSE The purpose of this study was to investigate the influence of increasing the tibial boundaries in functional alignment on femoral component orientation in total knee arthroplasty (TKA). METHODS A retrospective review of a database of robotic-assisted TKAs using a digital joint tensioning device was performed (BalanceBot®; Corin). A total of 692 TKAs with correctable deformity were included. Functional alignment with a tibia-first balancing technique was simulated by performing an anatomic tibial resection to recreate the native medial proximal tibial angle within certain boundaries (A, 87-90°; B, 86-90°; C, 84-92°), while accounting for wear. After balancing the knee, the resulting amount of femoral component outliers in the coronal and axial plane was calculated for each group and correlated to the coronal plane alignment of the knee (CPAK) classification. RESULTS The proportion of knees with high femoral component varus (>96°) or valgus (<87°) alignment increased from 24.5% (n = 170) in group A to 26.5% (n = 183) in group B and 34.2% (n = 237) in group C (p < 0.05). Similarly, more knees with high femoral component external rotation (>6°) or internal rotation (>3°) were identified in group C (33.4%, n = 231) than in group B (23.7%, n = 164) and A (18.4%, n = 127) (p < 0.05). There was a statistically significant (p < 0.01) overall increase in knees with both femoral component valgus <87° and internal rotation >3° from group A (4.0%, n = 28) to B (7.7%, n = 53) and C (15.8%, n = 109), with CPAK type I and II showing a 12.9- and 2.9-fold increase, respectively. CONCLUSION Extending the tibial boundaries when using functional alignment with a tibia-first balancing technique in TKA leads to a statistically significant higher percentage of knees with a valgus lateral distal femoral angle < 87° and >3° internal rotation of the femoral component, especially in CPAK type I and II. LEVEL OF EVIDENCE Level IV.
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Affiliation(s)
- Britt Ollivier
- Department of Orthopaedics, University Hospitals Leuven, Leuven, Belgium
| | | | | | - Hilde Vandenneucker
- Department of Orthopaedics, University Hospitals Leuven, Leuven, Belgium
- Department of Development and Regeneration, KU Leuven, University of Leuven, Leuven, Belgium
| | - Thomas Luyckx
- Department of Orthopaedic Surgery, AZ Delta, Roeselare, Belgium
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Edelstein AI, Orsi AD, Plaskos C, Coffey S, Suleiman LI. Imageless robotic total knee arthroplasty determines similar coronal plane alignment of the knee (CPAK) parameters to long leg radiographs. ARTHROPLASTY 2024; 6:14. [PMID: 38431650 PMCID: PMC10909262 DOI: 10.1186/s42836-024-00231-9] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/16/2023] [Accepted: 01/01/2024] [Indexed: 03/05/2024] Open
Abstract
BACKGROUND The coronal plane alignment of the knee (CPAK) classification was first developed using long leg radiographs (LLR) and has since been reported using image-based and imageless robotic total knee arthroplasty (TKA) systems. However, the correspondence between imageless robotics and LLR-derived CPAK parameters has yet to be investigated. This study therefore examined the differences in CPAK parameters determined with LLR and imageless robotic navigation using either generic or optimized cartilage wear assumptions. METHODS Medial proximal tibial angle (MPTA) and lateral distal femoral angle (LDFA) were determined from the intraoperative registration data of 61 imageless robotic TKAs using either a generic 2 mm literature-based wear assumption (Navlit) or an optimized wear assumption (Navopt) found using an error minimization algorithm. MPTA and LDFA were also measured from preoperative LLR by two observers and intraclass correlation coefficients (ICCs) were calculated. MPTA, LDFA, joint line obliquity (JLO), and arithmetic hip-knee-ankle angle (aHKA) were compared between the robotic and the average LLR measurements over the two observers. RESULTS ICCs between observers for LLR were over 0.95 for MPTA, LDFA, JLO, and aHKA, indicating excellent agreement. Mean CPAK differences were not significant between LLR and Navlit (all differences within 0.6°, P > 0.1) or Navopt (all within 0.1°, P > 0.83). Mean absolute errors (MAE) between LLR and Navlit were: LDFA = 1.4°, MPTA = 2.0°, JLO = 2.1°, and aHKA = 2.7°. Compared to LLR, the generic wear classified 88% and the optimized wear classified 94% of knees within one CPAK group. Bland-Altman comparisons reported good agreement for LLR vs. Navlit and Navopt, with > 95% and > 91.8% of measurements within the limits of agreement across all CPAK parameters, respectively. CONCLUSIONS Imageless robotic navigation data can be used to calculate CPAK parameters for arthritic knees undergoing TKA with good agreement to LLR. Generic wear assumptions determined MPTA and LDFA with MAE within 2° and optimizing wear assumptions showed negligible improvement.
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Affiliation(s)
- Adam I Edelstein
- Department of Orthopaedic Surgery, Northwestern University Feinberg School of Medicine, Chicago, IL, 60611, USA
| | | | | | - Simon Coffey
- Department of Orthopaedics, Nepean Hospital, Penrith, NSW, 2750, Australia
| | - Linda I Suleiman
- Department of Orthopaedic Surgery, Northwestern University Feinberg School of Medicine, Chicago, IL, 60611, USA
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Sterneder CM, Faschingbauer M, Haralambiev L, Kasparek MF, Boettner F. Why Kinematic Alignment Makes Little Sense in Valgus Osteoarthritis of the Knee: A Narrative Review. J Clin Med 2024; 13:1302. [PMID: 38592153 PMCID: PMC10932440 DOI: 10.3390/jcm13051302] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/28/2024] [Revised: 02/20/2024] [Accepted: 02/22/2024] [Indexed: 04/10/2024] Open
Abstract
There is a debate about the best alignment strategies in total knee arthroplasty (TKA). Mechanical alignment (MA) targets in combination with necessary soft tissue releases are the gold standard for TKA in end-stage valgus osteoarthritis. Some authors propagate kinematic alignment (KA) with the aim of restoring the patient's native alignment and minimizing the need for soft tissue releases. Our previous studies showed that MA with standardized soft tissue release produces reproducible results, and that the preoperative phenotype does not influence the results of patients with valgus osteoarthritis. These data suggest that there is no functional advantage to preserving valgus alignment in patients with valgus osteoarthritis. Many patients with valgus osteoarthritis present with a compromised medial collateral ligament and leaving the knee in valgus could increase the risk of secondary instability. The current literature supports MA TKA with soft tissue release as the gold standard. While using more sophisticated enabling technologies like robotic surgery might allow for aiming for very slight (1-2°) valgus alignment on the femoral side, any valgus alignment outside this range should be avoided. This review paper summarizes our current knowledge on the surgical techniques of TKA in patients with valgus osteoarthritis.
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Affiliation(s)
- Christian Manuel Sterneder
- Adult Reconstruction and Joint Replacement Department, Hospital for Special Surgery, 535 East 70th Street, New York, NY 10021, USA
| | - Martin Faschingbauer
- Department of Orthopedic Surgery, University of Ulm, Oberer Eselsberg 45, 89081 Ulm, Germany
| | - Lyubomir Haralambiev
- Center for Orthopaedics, Trauma Surgery and Rehabilitation Medicine, University Medicine Greifswald, Ferdinand-Sauerbruch-Straße, 17475 Greifswald, Germany
| | - Maximilian F. Kasparek
- Department of Orthopedics, Evangelisches Krankenhaus, Hans-Sachs Gasse 10-12, 1180 Vienna, Austria
| | - Friedrich Boettner
- Adult Reconstruction and Joint Replacement Department, Hospital for Special Surgery, 535 East 70th Street, New York, NY 10021, USA
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Dagneaux L, Canovas F, Jourdan F. Finite element analysis in the optimization of posterior-stabilized total knee arthroplasty. Orthop Traumatol Surg Res 2024; 110:103765. [PMID: 37979672 DOI: 10.1016/j.otsr.2023.103765] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 11/29/2022] [Accepted: 06/06/2023] [Indexed: 11/20/2023]
Abstract
Posterior-stabilized total knee arthroplasty (PS-TKA) is associated with high rates of satisfaction and functional recovery. This is notably attributed to implant optimization in terms of design, choice of materials, positioning and understanding of biomechanics. Finite elements analysis (FEA) is an assessment technique that contributed to this optimization by ensuring mechanical results based on numerical simulation. By close teamwork between surgeons, researchers and engineers, FEA enabled testing of certain clinical impressions. However, the methodological features of the technique led to wide variations in the presentation and interpretation of results, requiring a certain understanding of numerical and biomechanical fields by the orthopedic community. The present study provides an up-to-date review, aiming to address the following questions: what are the principles of FEA? What is the role of FEA in studying PS design in TKA? What are the key elements in the literature for understanding the role of FEA in PS-TKA? What is the contribution of FEA for understanding of tibiofemoral and patellofemoral biomechanical behavior? What are the limitations and perspectives of digital simulation and FEA in routine practice, with a particular emphasis on the "digital twin" concept? LEVEL OF EVIDENCE: V, expert opinion.
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Affiliation(s)
- Louis Dagneaux
- Service de chirurgie orthopédique et traumatologie du membre inférieur, hôpital Lapeyronie, CHU de Montpellier, 371, avenue Gaston-Giraud, 34295 Montpellier cedex 5, France; Laboratoire de mécanique et génie civil (LMGC), Montpellier University of Excellence (MUSE), université de Montpellier, 860, rue de St-Priest, 34090 Montpellier, France.
| | - François Canovas
- Service de chirurgie orthopédique et traumatologie du membre inférieur, hôpital Lapeyronie, CHU de Montpellier, 371, avenue Gaston-Giraud, 34295 Montpellier cedex 5, France
| | - Franck Jourdan
- Laboratoire de mécanique et génie civil (LMGC), Montpellier University of Excellence (MUSE), université de Montpellier, 860, rue de St-Priest, 34090 Montpellier, France
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Strauch M, Kaufmann V, Graichen H. Tibia-first, gap-balanced patient-specific alignment technique achieves well-balanced gaps in 90% of cases by rebuilding bony anatomy within boundaries. Knee Surg Sports Traumatol Arthrosc 2024; 32:381-388. [PMID: 38270248 DOI: 10.1002/ksa.12056] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 11/19/2023] [Revised: 12/27/2023] [Accepted: 01/02/2024] [Indexed: 01/26/2024]
Abstract
PURPOSE Patient-specific alignment (PSA) technique tries to achieve balanced gaps and simultaneously rebuild the individual bony phenotype. The hypothesis was: PSA technique achieves balanced knees in a high percentage with more anatomical resections than adjusted mechanical alignment (AMA). METHODS Three hundred sixty-seven patients underwent navigated total knee arthroplasty (TKA) with a tibia-first gap-balanced PSA technique. Resection boundaries for medial proximal tibia angle (MPTA) of 86-92°, mechanical lateral distal femoral angle (mLDFA) of 86-92°, and hip-knee-ankle angle (HKA) of 175-185° were defined. Preoperative and intraoperative parameters of HKA, MPTA, mLDFA, and gap widths were recorded. Depending on the coronal deformity, the patients were divided into three groups: varus HKA < 178°; straight 178-182° and valgus HKA > 182°. The stability was analysed by assessing the difference between medial and lateral extension and flexion gaps as well as between flexion and extension gaps. All PSA measurements were compared with data from a previously published AMA series. RESULTS PSA achieved balanced gaps in extension, flexion and between flexion/extension in over 90% of cases, being similar to AMA. In PSA, MPTA and mLDFA were restored within 1°, except in extreme varus (MPTA difference 2°) and valgus knees (mLDFA difference 3°). This was caused by the defined boundaries of the alignment technique. This individualised reconstruction led to significantly more anatomical resections of all tibia and femur resections. CONCLUSION A tibia-first, gap-balanced PSA technique achieves balanced joints in more than 90% of cases. By maintaining preoperative MPTA and mLDFA to a high extent, far more anatomical resections, compared to AMA were performed. Future studies need to be conducted to investigate whether those promising intraoperative results correlate with postoperative patient outcomes and whether patients outside the 5° corridor have higher failure rates. LEVEL OF EVIDENCE Level III, retrospective cohort study.
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Affiliation(s)
- Marco Strauch
- Department for Arthroplasty, Sports-Traumatology and General Orthopaedics, Asklepios Orthopaedic Hospital Lindenlohe, Schwandorf, Germany
| | - Verena Kaufmann
- Department for Arthroplasty, Sports-Traumatology and General Orthopaedics, Asklepios Orthopaedic Hospital Lindenlohe, Schwandorf, Germany
| | - Heiko Graichen
- Department for Arthroplasty, Sports-Traumatology and General Orthopaedics, Asklepios Orthopaedic Hospital Lindenlohe, Schwandorf, Germany
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Brown NM, Lingampalli N, Hellman MD. Intraoperative Challenges of the Kinematic Knee. Orthop Clin North Am 2024; 55:27-32. [PMID: 37980101 DOI: 10.1016/j.ocl.2023.07.001] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2023]
Abstract
Total knee arthroplasty (TKA) is a widely accepted surgical procedure for managing end-stage knee osteoarthritis. Among the various TKA techniques, kinematic alignment has gained increasing popularity as it can potentially restore a more natural joint function. However, despite its theoretical advantages, kinematic total knee replacement presents several operative challenges that necessitate a thorough understanding and analysis of patient-specific anatomy during surgical planning and execution. This review article aims to critically evaluate the operative challenges associated with kinematic TKA and explore potential strategies to optimize surgical outcomes. The challenges encompass multiple aspects including patient selection, preoperative planning, bone cuts, soft tissue balancing, and component positioning.
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Affiliation(s)
- Nicholas M Brown
- Loyola University Medical Center, 2160 South 1st Avenue #3328, Maywood, IL 60153, USA.
| | - Nithya Lingampalli
- Loyola University Medical Center, 2160 South 1st Avenue #3328, Maywood, IL 60153, USA
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Lee BS, Bin SI, Kim JM, Kim TH, Oh SM. Twenty-year survivorship cohort study of total knee arthroplasty in Asian patient using a single posterior-stabilized implant performed by a single surgeon. Orthop Traumatol Surg Res 2023; 109:103644. [PMID: 37331652 DOI: 10.1016/j.otsr.2023.103644] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 09/11/2022] [Revised: 05/05/2023] [Accepted: 06/05/2023] [Indexed: 06/20/2023]
Abstract
INTRODUCTION As life expectancy has improved, the potential number of revision candidates is also expected to increase among patients who have undergone a total knee arthroplasty (TKA). The longevity of modern posterior stabilized knee prostheses after 20 years of use has not been well documented, especially in Asian populations that require a deeper flexion range due to a floor-based lifestyle. HYPOTHESIS Firstly, the implant longevity regarding mechanical failures such as aseptic loosening and polyethylene (PE) wear would vary over a longer follow-up depending on the age groups; and secondly there would be unique risk factors for revision surgery in an Asian TKA cohort. MATERIAL AND METHODS We conducted this age-stratified survival analysis in a consecutive series of 368 NexGen Legacy Posterior Stabilized (LPS) TKAs performed by a single surgeon. These cases were divided into four age groups (< 60 years, early 60s, late 60s, and ≥ 70 years). The implant longevity against aseptic mechanical failures was calculated using the Kaplan-Meier method. The revision surgery risk was evaluated using postoperative factors including a deep flexion capability (> 135̊), and postoperative mechanical alignments. RESULTS Overall survivorship was significantly lower in the youngest groups than other groups (Log-rank test, p=0.001). The cumulative 20-year implant longevity was more than 95% in the two oldest groups, but less than 60% in the youngest group. It was notable that the post-TKA implant longevity was not apparent up to 10 years between the age groups (p=0.073∼0.458). Aseptic loosening was observed with an earlier onset (3.1 to 18.9 years) trend than PE wear (9.8∼17.9 years), with most cases arising in the youngest groups. Flexion limitation and varus alignment were significant risks to aseptic loosening and PE wear (Cox proportional hazard regression: p=0.001 and 0.045, respectively). DISCUSSION A younger age (< 60 years), inability of postoperative deep flexion, and varus alignment were significant risk factors for aseptic loosening and PE wear after modern PS design in this Asian cohort. The difference in postoperative longevity affected by these factors was not obvious during the first 10 years but emerged over a second decade. LEVEL OF PROOF III; retrospective cohort study.
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Affiliation(s)
- Bum-Sik Lee
- College of Medicine, University of Ulsan, Asan Medical Center, 88, Olympic-ro 43-gil, Songpa-gu, 05505 Seoul, Republic of Korea
| | - Seong-Il Bin
- Department of Orthopedic Surgery, Unjeong Inbone Hospital, 31, Cheongam-ro 17-gil, Paju-si, 10892 Gyeonggi-do, Republic of Korea.
| | - Jong-Min Kim
- College of Medicine, University of Ulsan, Asan Medical Center, 88, Olympic-ro 43-gil, Songpa-gu, 05505 Seoul, Republic of Korea
| | - Tae-Hyuk Kim
- Gimpo Woori Hospital, 11, Gamam-ro, Gimpo-si, Gyeonggi-do, Republic of Korea
| | - Sung-Mok Oh
- Department of Orthopedic Surgery, Barun Hospital, 145, Yeouidaebang-ro, Yeongdeungpo-gu, 07392 Seoul, Republic of Korea
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Karasavvidis T, Pagan Moldenhauer CA, Lustig S, Vigdorchik JM, Hirschmann MT. Definitions and consequences of current alignment techniques and phenotypes in total knee arthroplasty (TKA) - there is no winner yet. J Exp Orthop 2023; 10:120. [PMID: 37991599 PMCID: PMC10665290 DOI: 10.1186/s40634-023-00697-7] [Citation(s) in RCA: 9] [Impact Index Per Article: 9.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 08/15/2023] [Accepted: 11/16/2023] [Indexed: 11/23/2023] Open
Abstract
Dissatisfaction following total knee arthroplasty (TKA) has been extensively documented and it was attributed to numerous factors. In recent years, significant focus has been directed towards implant alignment and stability as potential causes and solutions to this issue. Surgeons are now exploring a more personalized approach to TKA, recognizing the importance of thoroughly understanding each individual patient's anatomy and functional morphology. A more comprehensive preoperative analysis of alignment and knee morphology is essential to address the unresolved questions in knee arthroplasty effectively. The crucial task of determining the most appropriate alignment strategy for each patient arises, given the substantial variability in bone resection resulting from the interplay of phenotype and the alignment strategy chosen. This review aims to comprehensively present the definitions of different alignment techniques in all planes and discuss the consequences dependent on knee phenotypes.Level of evidence V.
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Affiliation(s)
- Theofilos Karasavvidis
- Adult Reconstruction and Joint Replacement Service, Department of Orthopaedic Surgery, Hospital for Special Surgery, 535 East 70th Street, New York, NY, 10021, USA.
| | - Cale A Pagan Moldenhauer
- Adult Reconstruction and Joint Replacement Service, Department of Orthopaedic Surgery, Hospital for Special Surgery, 535 East 70th Street, New York, NY, 10021, USA
| | - Sébastien Lustig
- Department of Orthopaedic Surgery and Sports Medicine, Croix-Rousse Hospital, Lyon, 69004, France
| | - Jonathan M Vigdorchik
- Adult Reconstruction and Joint Replacement Service, Department of Orthopaedic Surgery, Hospital for Special Surgery, 535 East 70th Street, New York, NY, 10021, USA
| | - Michael T Hirschmann
- Department of Orthopaedic Surgery and Traumatology, Kantonsspital Baselland, Bruderholz, CH-4101, Switzerland
- Department of Clinical Research, Research Group Michael T. Hirschmann, Regenerative Medicine & Biomechanics, University of Basel, Basel, CH-4001, Switzerland
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Ollivier B, Vandenneucker H, Vermue H, Luyckx T. A robotic-assisted simulation of kinematic alignment in TKA leads to excessive valgus and internal rotation in valgus knees. Knee Surg Sports Traumatol Arthrosc 2023; 31:4747-4754. [PMID: 37464100 DOI: 10.1007/s00167-023-07504-x] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 03/19/2023] [Accepted: 07/03/2023] [Indexed: 07/20/2023]
Abstract
PURPOSE Strategies to further improve patient satisfaction after total knee arthroplasty include the introduction of new alignment philosophies and more precise instruments such as navigation and robotics. The aim of this study was to investigate the effect of a combination of image-based robotic assistance and the use of modern alignment strategies on the resulting joint line obliquity as well as femoral component rotation and to compare this between varus, neutral and valgus knees. METHODS This retrospective study included 200 patients who received a robotic-assisted total knee arthroplasty (MAKO®, Stryker) using functional alignment between 2018 and 2020. The patients were divided into a varus (103 patients), neutral (57 patients) and valgus (40 patients) group. The intraoperatively recorded bone cuts and resulting joint line obliquity were identified and compared to values obtained with a robotic computer simulation of kinematic alignment. RESULTS The mean femoral coronal alignment of the varus, neutral and valgus group, respectively, equalled 0.5° (± 1.1°), 1.1° (± 0.8°) and 1.6° (± 0.7°) of valgus with functional alignment and 2.1° (± 2.1°), 4.1° (± 1.7°) and 6.2° (± 1.7°) of valgus with kinematic alignment. The mean femoral axial alignment of the valgus group resulted in 0.8° (± 2.0°) of internal rotation with functional alignment and 3.9° (± 2.8°) of internal rotation with kinematic alignment. Overall, 186 knees (93%) could be balanced while respecting certain safe zones by using functional alignment as opposed to 54 knees (27% and none in the valgus group) when applying kinematic alignment. Kinematic alignment led to a combination of femoral component valgus and internal rotation of more than 3° in 22 valgus knees (55%), 10 neutral knees (18%) and 3 varus knees (3%) compared to none in each group when applying functional alignment with safe zones. CONCLUSIONS Robotic-assisted kinematic alignment leads to a combination of excessive valgus and internal rotation of the femoral component in valgus and to a lesser extent also in neutral knees when compared with functional alignment. LEVEL OF EVIDENCE IV.
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Affiliation(s)
- Britt Ollivier
- Department of Orthopaedics, University Hospitals Leuven, Herestraat 49, 3000, Louvain, Belgium.
| | - Hilde Vandenneucker
- Department of Orthopaedics, University Hospitals Leuven, Herestraat 49, 3000, Louvain, Belgium
- Department of Development and Regeneration, KU Leuven, University of Leuven, 3000, Louvain, Belgium
| | - Hannes Vermue
- Department of Orthopaedic Surgery, Ghent University Hospital, Ghent, Belgium
| | - Thomas Luyckx
- Department of Orthopaedic Surgery, AZ Delta, Roeselare, Belgium
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Winnock de Grave P, Van Criekinge T, Luyckx T, Moreels R, Gunst P, Claeys K. Restoration of the native tibial joint line obliquity in total knee arthroplasty with inverse kinematic alignment does not increase knee adduction moments. Knee Surg Sports Traumatol Arthrosc 2023; 31:4692-4704. [PMID: 37311955 DOI: 10.1007/s00167-023-07464-2] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 01/07/2023] [Accepted: 05/20/2023] [Indexed: 06/15/2023]
Abstract
PURPOSE Patient-specific alignment in total knee arthroplasty (TKA) has shown promising patient-reported outcome measures; however, the clinical and biomechanical effects of restoring the native knee anatomy remain debated. The purpose of this study was to compare the gait pattern between a mechanically aligned TKA cohort (adjusted mechanical alignment-aMA) and a patient-specific alignment TKA cohort (inverse kinematic alignment-iKA). METHODS At two years postoperatively, the aMA and iKA groups, each with 15 patients, were analyzed in a retrospective case-control study. All patients underwent TKA with robotic assistance (Mako, Stryker) through an identical perioperative protocol. The patients' demographics were identical. The control group comprised 15 healthy participants matched for age and gender. Gait analysis was performed with a 3D motion capture system (VICON). Data collection was conducted by a blinded investigator. The primary outcomes were knee flexion during walking, knee adduction moment during walking and spatiotemporal parameters (STPs). The secondary outcomes were the Oxford Knee Score (OKS) and Forgotten Joint Score (FJS). RESULTS During walking, the maximum knee flexion did not differ between the iKA group (53.0°) and the control group (55.1°), whereas the aMA group showed lower amplitudes of sagittal motion (47.4°). In addition, the native limb alignment in the iKA group was better restored, and although more in varus, the knee adduction moments in the iKA group were not increased (225 N mm/kg) compared to aMA group (276 N mm/kg). No significant differences in STPs were observed between patients receiving iKA and healthy controls. Six of 7 STPs differed significantly between patients receiving aMA and healthy controls. The OKS was significantly better in patients receiving iKA than aMA: 45.4 vs. 40.9; p = 0.05. The FJS was significantly better in patients receiving iKA than aMA: 84.8 vs. 55.5; p = 0.002. CONCLUSION At two years postoperatively, the gait pattern showed greater resemblance to that in healthy controls in patients receiving iKA rather than aMA. The restoration of the native coronal limb alignment does not lead to increased knee adduction moments due to the restoration of the native tibial joint line obliquity. LEVEL OF EVIDENCE Level III.
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Affiliation(s)
- Philip Winnock de Grave
- Department Rehabilitation Sciences, KU Leuven, Brugge, Belgium.
- Department Orthopaedic Surgery, AZ Delta Roeselare, Brugsesteenweg 90, 8800, Roeselare, Belgium.
| | | | - Thomas Luyckx
- Department Orthopaedic Surgery, AZ Delta Roeselare, Brugsesteenweg 90, 8800, Roeselare, Belgium
- Department Orthopaedic Surgery, UZ Leuven, Louvain, Belgium
| | - Robin Moreels
- Department Orthopaedic Surgery, AZ Delta Roeselare, Brugsesteenweg 90, 8800, Roeselare, Belgium
- Department Orthopaedic Surgery, UZ Gent, Ghent, Belgium
| | - Paul Gunst
- Department Orthopaedic Surgery, AZ Delta Roeselare, Brugsesteenweg 90, 8800, Roeselare, Belgium
| | - Kurt Claeys
- Department Rehabilitation Sciences, KU Leuven, Brugge, Belgium
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Edelstein AI, Wakelin EA, Plaskos C, Suleiman LI. Laxity, Balance, and Alignment of a Simulated Kinematic Alignment Total Knee Arthroplasty. Arthroplast Today 2023; 23:101204. [PMID: 37745959 PMCID: PMC10514418 DOI: 10.1016/j.artd.2023.101204] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 03/31/2023] [Revised: 06/23/2023] [Accepted: 07/24/2023] [Indexed: 09/26/2023] Open
Abstract
Background Kinematic alignment (KA) and related personalized alignment strategies in total knee arthroplasty (TKA) target restoration of native joint line obliquity and alignment. In practice, deviations from exact restoration of the prearthritic joint surface are tolerated for either the femur or tibia to achieve ligamentous balance. It remains unknown what laxity, balance, and alignment would result if a pure resurfacing of both femur and tibia were performed in a KA TKA technique. Methods We used data from 382 robot-assisted TKA performed with a digital joint tensioner to simulate TKA with a pure resurfacing KA technique for both femur and tibia. All knees had the posterior cruciate ligament retained. Knees were subdivided into 4 groups based on preoperative coronal alignment: valgus, neutral, varus, and high varus. Medial and lateral laxity in extension and flexion, balance in extension and flexion, and coronal plane alignment were compared between groups using analysis of variance testing. Results In simulated pure resurfacing KA TKA across a range of preoperative coronal plane deformities, only 11%-31% of knees would have mediolateral extension ligament balance within ±1 mm, and 20%-41% would have a medial flexion gap that is looser than the lateral flexion gap. Over 45% of knees would have coronal hip-knee-ankle angle >3 degrees from mechanical neutral. Conclusions In simulations of pure resurfacing KA TKA, there was wide variability in the resulting laxity and alignment outcomes. Most knees had alignment and balance outcomes outside of normally accepted ranges. Techniques that deviate from pure resurfacing in order to achieve balance appear favorable.
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Affiliation(s)
- Adam I. Edelstein
- Department of Orthopaedic Surgery, Northwestern University Feinberg School of Medicine, Chicago, IL, USA
| | | | | | - Linda I. Suleiman
- Department of Orthopaedic Surgery, Northwestern University Feinberg School of Medicine, Chicago, IL, USA
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18
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Matassi F, Pettinari F, Frasconà F, Innocenti M, Civinini R. Coronal alignment in total knee arthroplasty: a review. J Orthop Traumatol 2023; 24:24. [PMID: 37217767 DOI: 10.1186/s10195-023-00702-w] [Citation(s) in RCA: 7] [Impact Index Per Article: 7.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 10/10/2022] [Accepted: 05/01/2023] [Indexed: 05/24/2023] Open
Abstract
Total knee arthroplasty (TKA) alignment has recently become a hot topic in the orthopedics arthroplasty literature. Coronal plane alignment especially has gained increasing attention since it is considered a cornerstone for improved clinical outcomes. Various alignment techniques have been described, but none proved to be optimal and there is a lack of general consensus on which alignment provides best results. The aim of this narrative review is to describe the different types of coronal alignments in TKA, correctly defining the main principles and terms.
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Affiliation(s)
- F Matassi
- Orthopedic Clinic, AOU Careggi, University of Florence, Florence, Italy
| | - F Pettinari
- Orthopedic Clinic, AOU Careggi, University of Florence, Florence, Italy.
| | - F Frasconà
- Orthopedic Clinic, AOU Careggi, University of Florence, Florence, Italy
| | - M Innocenti
- Orthopedic Clinic, AOU Careggi, University of Florence, Florence, Italy
| | - R Civinini
- Orthopedic Clinic, AOU Careggi, University of Florence, Florence, Italy
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19
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Hsieh SL, Lin TL, Hung CH, Fong YC, Chen HT, Tsai CH. Clinical and Radiographic Outcomes of Inversed Restricted Kinematic Alignment Total Knee Arthroplasty by Asia Specific (Huang’s) Phenotypes, a Prospective Pilot Study. J Clin Med 2023; 12:jcm12062110. [PMID: 36983113 PMCID: PMC10057926 DOI: 10.3390/jcm12062110] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/10/2023] [Revised: 02/23/2023] [Accepted: 03/03/2023] [Indexed: 03/10/2023] Open
Abstract
Inverse restricted kinematic alignment (irKA) was modified from restricted kinematic alignment for total knee arthroplasty (TKA). This prospective single-center study aimed to evaluate the outcomes of irKA-TKA on all knee subtypes classified by Asia specific (Huang’s) phenotypes. A total of 96 knees that underwent irKA-TKA at one hospital between January 2018 and June 2020 were included, with 15 knees classified in Type 1, nine in Type 2, 15 in Type 3, 47 in Type 4, and 10 in Type 5 by Huang’s phenotypes. Outcomes were knee alignment measures and patient-reported satisfaction evaluated by the Western Ontario and McMaster Universities Arthritis Index (WOMAC) and traditional Chinese version of the Forgotten Joint Score-12 (FJS-12). Follow-up was one year. Type 4 knee was most significantly corrected in all angles by irKA-TKA, followed by Type 2 and 3 knees. Type 5 and 1 knee were only significantly corrected in some angles. The correlation between FJS-12 and WOMAC was good at 6 months (Pearson correlation coefficient (r) = 0.74) and moderate at 6 weeks, 3 months, and 12 months during follow-up (r = 0.37~0.47). FJS-12 and WOMAC displayed comparable hip–knee–ankle angle cut-off value (4.71° vs. 6.20°), sensitivity (70.49% vs. 67.19%), specificity (84.00% vs. 85.71%), and Youden index (54.49% vs. 52.90%) in prediction of good prognosis. In conclusion, irKA-TKA corrects knee alignment in all knee types with increasing satisfaction for one-year follow-up. Knees with presurgical varus deformity are most recommended for irKA-TKA. Both presurgical scores of the traditional Chinese version of FJS-12 and WOMAC predict the prognosis of irKA-TKA.
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Affiliation(s)
- Shang-Lin Hsieh
- Department of Orthopedics, China Medical University Hospital, Taichung 404, Taiwan
- Graduate Institute of Biomedical Sciences, China Medical University, Taichung 404, Taiwan
| | - Tsung-Li Lin
- Department of Orthopedics, China Medical University Hospital, Taichung 404, Taiwan
- Graduate Institute of Biomedical Sciences, China Medical University, Taichung 404, Taiwan
- Department of Sports Medicine, College of Health Care, China Medical University, Taichung 404, Taiwan
| | - Chih-Hung Hung
- Department of Orthopedics, China Medical University Hospital, Taichung 404, Taiwan
| | - Yi-Chin Fong
- Department of Orthopedics, China Medical University Hospital, Taichung 404, Taiwan
- Department of Sports Medicine, College of Health Care, China Medical University, Taichung 404, Taiwan
- Department of Orthopedics, China Medical University Beigang Hospital, Yunlin 651, Taiwan
| | - Hsien-Te Chen
- Department of Orthopedics, China Medical University Hospital, Taichung 404, Taiwan
- Department of Sports Medicine, College of Health Care, China Medical University, Taichung 404, Taiwan
| | - Chun-Hao Tsai
- Department of Orthopedics, China Medical University Hospital, Taichung 404, Taiwan
- Department of Sports Medicine, College of Health Care, China Medical University, Taichung 404, Taiwan
- Correspondence:
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MacDessi SJ, Oussedik S, Abdel MP, Victor J, Pagnano MW, Haddad FS. The language of knee alignment : updated definitions and considerations for reporting outcomes in total knee arthroplasty. Bone Joint J 2023; 105-B:102-108. [PMID: 36722056 DOI: 10.1302/0301-620x.105b2.bjj-2022-1345] [Citation(s) in RCA: 20] [Impact Index Per Article: 20.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 02/02/2023]
Abstract
Orthopaedic surgeons are currently faced with an overwhelming number of choices surrounding total knee arthroplasty (TKA), not only with the latest technologies and prostheses, but also fundamental decisions on alignment philosophies. From 'mechanical' to 'adjusted mechanical' to 'restricted kinematic' to 'unrestricted kinematic' - and how constitutional alignment relates to these - there is potential for ambiguity when thinking about and discussing such concepts. This annotation summarizes the various alignment strategies currently employed in TKA. It provides a clear framework and consistent language that will assist surgeons to compare confidently and contrast the concepts, while also discussing the latest opinions about alignment in TKA. Finally, it provides suggestions for applying consistent nomenclature to future research, especially as we explore the implications of 3D alignment patterns on patient outcomes.Cite this article: Bone Joint J 2023;105-B(2):102-108.
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Affiliation(s)
- Samuel J MacDessi
- Sydney Knee Specialists, Sydney, Australia.,The University of New South Wales, Sydney, Australia
| | | | - Matthew P Abdel
- Department of Orthopedic Surgery, Mayo Clinic, Rochester, Minnesota, USA
| | - Jan Victor
- Department of Orthopaedics, University Hospital of Ghent, Ghent, Belgium
| | - Mark W Pagnano
- Department of Orthopedic Surgery, Mayo Clinic, Rochester, Minnesota, USA
| | - Fares S Haddad
- University College London Hospitals, London, UK.,The Bone & Joint Journal, London, UK
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21
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Digital TKA Alignment Training with a New Digital Simulation Tool (Knee-CAT) Improves Process Quality, Efficiency, and Confidence. J Pers Med 2023; 13:jpm13020213. [PMID: 36836448 PMCID: PMC9960184 DOI: 10.3390/jpm13020213] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/06/2023] [Revised: 01/22/2023] [Accepted: 01/24/2023] [Indexed: 01/28/2023] Open
Abstract
Individual alignment techniques have been introduced to restore patients' unique anatomical variations during total knee arthroplasty. The transition from conventional mechanical alignment to individualised approaches, with the assistance of computer and/or robotic technologies, is challenging. The objective of this study was to develop a digital training platform with real patient data to educate and simulate various modern alignment philosophies. The aim was to evaluate the training effect of the tool by measuring the process quality and efficiency, as well as the post-training surgeon's confidence with new alignment philosophies. Based on 1000 data sets, a web-based interactive TKA computer navigation simulator (Knee-CAT) was developed. Quantitative decisions on bone cuts were linked to the extension and flexion gap values. Eleven different alignment workflows were introduced. A fully automatic evaluation system for each workflow, with a comparison function for all workflows, was implemented to increase the learning effect. The results of 40 surgeons with different experience levels using the platform were assessed. Initial data were analysed regarding process quality and efficiency and compared after two training courses. Process quality measured by the percentage of correct decisions was increased by the two training courses from 45% to 87.5%. The main reasons for failure were wrong decisions on the joint line, tibia slope, femoral rotation, and gap balancing. Efficiency was obtained with a reduction in time spent per exercise from 4 min 28 s to 2 min 35 s (42%) after the training courses. All volunteers rated the training tool as helpful or extremely helpful for learning new alignment philosophies. Separating the learning experience from OR performance was mentioned as one of the main advantages. A novel digital simulation tool for the case-based learning of various alignment philosophies in TKA surgery was developed and introduced. The simulation tool, together with the training courses, improved surgeon confidence and their ability to learn new alignment techniques in a stress-free out-of-theatre environment and to become more time efficient in making correct alignment decisions.
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22
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Orsi AD, Wakelin E, Plaskos C, McMahon S, Coffey S. Restricted Inverse Kinematic Alignment Better Restores the Native Joint Line Orientation While Achieving Similar Balance, Laxity, and Arithmetic Hip-Knee-Ankle Angle to Gap Balancing Total Knee Arthroplasty. Arthroplast Today 2023; 19:101090. [PMID: 36688096 PMCID: PMC9851873 DOI: 10.1016/j.artd.2022.101090] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 07/20/2022] [Revised: 11/29/2022] [Accepted: 12/17/2022] [Indexed: 01/17/2023] Open
Abstract
Background Both restricted inverse kinematic alignment (iKA) and gap balancing aim for a balanced total knee arthroplasty by adjusting femoral component position based on ligamentous gaps. However, iKA targets a native tibial joint line vs resecting perpendicular to the mechanical axis. This study compares how these 2 techniques impact the balance and laxity throughout flexion and joint line obliquity (JLO), arithmetic hip-knee-ankle angle (aHKA), and the coronal plane alignment of the knee (CPAK). Methods Two surgeons performed 75 robot-assisted iKA total knee arthroplasties. A digital joint tensioner collected laxity data throughout flexion before femoral resection. The femoral component position was determined using predictive gap-planning to optimize the balance throughout flexion. Planned gap balancing (pGB) simulations were performed for each case using neutral tibial resections. Mediolateral balance, laxity, and CPAK were compared among pGB, planned iKA (piKA), and final iKA. Results Both piKA and pGB had similar mediolateral balance and laxity, with mean differences <0.4 mm. piKA had a lower mean absolute difference from native JLO than pGB (3 ± 2° vs 7 ± 4°, P < .001). aHKA was similar (P > .05) between pGB and piKA. piKA recreated a more native CPAK distribution, with types I-V being the most common ones, while most pGB knees were of type V, VII, and III. Final iKA and piKA had similar mediolateral balance and laxity, with a root-mean-square error <1.4 mm. Conclusions Although balance, laxity, and aHKA were similar between piKA and pGB, piKA better restored native JLO and CPAK phenotypes. The neutral tibial resection moved most pGB knees into types V, VII, and III. Surgeons should appreciate how the alignment strategy affects knee phenotypes.
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Affiliation(s)
- Alexander D. Orsi
- Corin Clinical Research, Raynham, MA, USA,Corresponding author. Corin Clinical Research, 480 Paramount Drive, Raynham MA, 02767, USA. Tel.: +1 617 877 1474.
| | | | | | - Stephen McMahon
- Department of Orthopaedics, The Avenue Hospital, Windsor, Victoria, Australia
| | - Simon Coffey
- Department of Orthopaedics, Nepean Hospital, Penrith, New South Wales, Australia
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23
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Morcos MW, Uhuebor D, Vendittoli PA. Overview of the different personalized total knee arthroplasty with robotic assistance, how choosing? Front Surg 2023; 10:1120908. [PMID: 36936647 PMCID: PMC10020354 DOI: 10.3389/fsurg.2023.1120908] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/10/2022] [Accepted: 02/13/2023] [Indexed: 03/06/2023] Open
Abstract
Current limitations in total knee arthroplasty (TKA) function and patient satisfaction stimulated us to question our practice. Our understanding of knee anatomy and biomechanics has evolved over recent years as we now consider that a more personalized joint reconstruction may be a better-targeted goal for TKA. Implant design and surgical techniques must be advanced to better reproduce the anatomy and kinematics of native knees and ultimately provide a forgotten joint. The availability of precision tools as robotic assistance surgery can help us recreate patient anatomy and ensure components are not implanted in a position that may compromise long-term outcomes. Robotic-assisted surgery is gaining in popularity and may be the future of orthopedic surgery. However, moving away from the concept of neutrally aligning every TKA dogma opens the door to new techniques emergence based on opinion and experience and leads to a certain amount of uncertainty among knee surgeons. Hence, it is important to clearly describe each technique and analyze their potential impacts and benefits. Personalized TKA techniques may be classified into 2 main families: unrestricted or restricted component orientation. In the restricted group, some will aim to reproduce native ligament laxity versus aiming for ligament isometry. When outside of their boundaries, all restricted techniques will induce anatomical changes. Similarly, most native knee having asymmetric ligaments laxity between compartments and within the same compartment during the arc of flexion; aiming for ligament isometry induces bony anatomy changes. In the current paper, we will summarize and discuss the impacts of the different robotic personalized alignment techniques, including kinematic alignment (KA), restricted kinematic alignment (rKA), inverse kinematic alignment (iKA), and functional alignment (FA). With every surgical technique, there are limitations and shortcomings. As our implants are still far from the native knee, it is primordial to understand the impacts and benefits of each technique. Mid to long data will help us in defining the new standards.
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Affiliation(s)
- Mina Wahba Morcos
- Department of Surgery, Hôpital Maisonneuve-Rosemont, Montreal University, Montreal, QC, Canada
| | - David Uhuebor
- Department of Surgery, Hôpital Maisonneuve-Rosemont, Montreal University, Montreal, QC, Canada
| | - Pascal-André Vendittoli
- Department of Surgery, Hôpital Maisonneuve-Rosemont, Montreal University, Montreal, QC, Canada
- Clinique Orthopédique Duval, Laval, QC, Canada
- Personalized Arthroplasty Society, Atlanta, GA, United States
- Correspondence: Pascal-André Vendittoli
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Mulpur P, Desai KB, Mahajan A, Masilamani ABS, Hippalgaonkar K, Reddy AVG. Radiological Evaluation of the Phenotype of Indian Osteoarthritic Knees based on the Coronal Plane Alignment of the Knee Classification (CPAK). Indian J Orthop 2022; 56:2066-2076. [PMID: 36507214 PMCID: PMC9705643 DOI: 10.1007/s43465-022-00756-8] [Citation(s) in RCA: 17] [Impact Index Per Article: 8.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 07/28/2022] [Accepted: 09/15/2022] [Indexed: 02/04/2023]
Abstract
Background Understanding constitutional alignment of the lower limb is essential to optimize alignment strategies during total knee arthroplasty. The coronal plane alignment of knee (CPAK) classification system was proposed as a comprehensive assessment tool based on coronal alignment and variations in joint line obliquity (JLO). This prospective observational cross-sectional study aimed to evaluate the phenotype of knees in the Indian population based on the CPAK system. Methods Two cohorts of individuals (250 young healthy volunteers and 250 elderly patients with knee osteoarthritis) underwent radiological assessment with long-leg radiographs and were classified based on the CPAK system. Measurements included the mechanical and arithmetic hip-knee-ankle angles (mHKA, aHKA), joint line obliquity (JLO), lateral distal femoral angle (mLDFA) and medial proximal tibial angle (mMPTA). Knees were grouped into 9 CPAK phenotypes based on aHKA and JLO. Results A total of 1000 knees were evaluated. In cohort-1 of healthy young adults, most knees were distributed in the CPAK class II phenotype (128 knees, 25.6%) followed by CPAK Type I (106 knees, 21.2%). In cohort-2 of elderly arthritic adults, most knees were distributed in Type I (294 knees, 58.8%) with constitutional varus and apex-distal joint line orientation. Conclusion The majority of the study population was found to have constitutional varus alignment. In addition, a high proportion of patients in both categories, especially arthritic patients undergoing TKA, were found to have varus alignment with an apex-distal oblique joint line. This classification may help optimize component positioning to restore constitutional alignment and joint line orientation during TKA.
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Affiliation(s)
- Praharsha Mulpur
- Sunshine Bone and Joint Institute, Sunshine Hospitals, PG Road, opposite Parsi Dharamsala, Paradise, Sappu Bagh Apartments, Jogani, Ramgopalpet, Secunderabad, Hyderabad, Telangana 500003 India
| | - Keyur B. Desai
- Sunshine Bone and Joint Institute, Sunshine Hospitals, PG Road, opposite Parsi Dharamsala, Paradise, Sappu Bagh Apartments, Jogani, Ramgopalpet, Secunderabad, Hyderabad, Telangana 500003 India
| | - Aakarsh Mahajan
- Sunshine Bone and Joint Institute, Sunshine Hospitals, PG Road, opposite Parsi Dharamsala, Paradise, Sappu Bagh Apartments, Jogani, Ramgopalpet, Secunderabad, Hyderabad, Telangana 500003 India
| | - A. B. Suhas Masilamani
- Sunshine Bone and Joint Institute, Sunshine Hospitals, PG Road, opposite Parsi Dharamsala, Paradise, Sappu Bagh Apartments, Jogani, Ramgopalpet, Secunderabad, Hyderabad, Telangana 500003 India
| | - Kushal Hippalgaonkar
- Sunshine Bone and Joint Institute, Sunshine Hospitals, PG Road, opposite Parsi Dharamsala, Paradise, Sappu Bagh Apartments, Jogani, Ramgopalpet, Secunderabad, Hyderabad, Telangana 500003 India
| | - A. V. Gurava Reddy
- Sunshine Bone and Joint Institute, Sunshine Hospitals, PG Road, opposite Parsi Dharamsala, Paradise, Sappu Bagh Apartments, Jogani, Ramgopalpet, Secunderabad, Hyderabad, Telangana 500003 India
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