Article
Orthopedics
Ameer M. Elbuluk, Seth A. Jerabek, Vincentius J. Suhardi, Peter K. Sculco, Michael P. Ast, Jonathan M. Vigdorchik
Summary: This study compared the differences between mechanical alignment and kinematic alignment strategies in total knee arthroplasty. The results showed that patients in the kinematic alignment group had less pain at 6 weeks postoperatively and higher Forgotten Joint Scores at 1 and 2 years postoperatively.
JOURNAL OF ARTHROPLASTY
(2022)
Article
Orthopedics
Guillaume Laforest, Lazaros Kostretzis, Marc-Olivier Kiss, Pascal-Andre Vendittoli
Summary: This study reports on the revision rate, clinical outcomes, and radiological signs in patients who underwent uncemented TKA using restricted KA principles. Results showed that in 99% of cases with an average follow-up of 49 months, there was no implant revision for aseptic loosening, indicating good short-term functional outcomes and anticipated favorable mid- to long-term implant survivorship.
KNEE SURGERY SPORTS TRAUMATOLOGY ARTHROSCOPY
(2022)
Article
Orthopedics
Gavin Clark, Richard Steer, David Wood
Summary: This study assessed the balance achievable with mechanical alignment and kinematic alignment plans, and found that functional alignment obtained significantly better balance. Overall balance was observed in 97% of functional alignment knees, 73% of kinematic alignment knees, and in 55% of mechanical alignment knees. Utilizing an individualized kinematic alignment plan allows functional alignment to best achieve the goals of maintaining joint line plane and obliquity.
KNEE SURGERY SPORTS TRAUMATOLOGY ARTHROSCOPY
(2023)
Article
Health Care Sciences & Services
Antonio Klasan, Andreas Kapshammer, Veronika Miron, Zoltan Major
Summary: The study compared the effects of mechanical alignment (MA) and kinematic alignment (KA) on contact pressure, contact area, and stress in total knee arthroplasty. The results showed that KA can reduce or maintain contact pressure by increasing or maintaining contact area. The stress distribution was similar between MA and KA, except for valgus knees where slightly higher stresses were observed for KA.
JOURNAL OF PERSONALIZED MEDICINE
(2022)
Article
Health Care Sciences & Services
Elliot Sappey-Mariner, Scott A. Wu, Stefano A. Bini
Summary: In this retrospective study involving 7 patients, revising stiff or unstable TKA from MA to KA resulted in improved range of motion by 30 degrees on averages, resolved instability without the use of constrained liners, improved clinical outcomes with a mean gain of 75 points on the KSS, and restored constitutional limb alignment within 2 degrees in all patients. Promising short term results warrant further study.
JOURNAL OF PERSONALIZED MEDICINE
(2022)
Article
Orthopedics
Binfeng Liu, Chengyao Feng, Chao Tu
Summary: This study compared the outcomes of kinematic alignment (KA) and mechanical alignment (MA) in total knee arthroplasty patients and found that the KA technique achieved better functional outcomes than the MA technique, while the two techniques had similar effects in other aspects.
JOURNAL OF ORTHOPAEDIC SURGERY AND RESEARCH
(2022)
Review
Orthopedics
Charles Riviere, Loic Villet, Dragan Jeremic, Pascal-Andre Vendittoli
Summary: This lecture discusses the importance of alignment philosophies in total knee arthroplasty, emphasizing the necessity of personalized and physiological implantation processes, as well as the in-depth exploration and evaluation of the kinematic alignment concept.
ORTHOPAEDICS & TRAUMATOLOGY-SURGERY & RESEARCH
(2021)
Article
Orthopedics
Matthew A. Follett, Prerna Arora, William J. Maloney, Stuart B. Goodman, James Huddleston, Derek F. Amanatullah
Summary: The technical differences between simultaneous and staged total knee arthroplasties (TKAs) can affect the clinical and radiographic outcomes. The study found that the second knee in simultaneous TKAs had a higher risk of establishing the mechanical axis outside neutral compared to staged TKAs. Staged TKAs had an increased risk of deep venous thrombosis. There were no significant differences in perioperative complications and range of motion between the two procedures.
JOURNAL OF ARTHROPLASTY
(2022)
Article
Health Care Sciences & Services
Yaron Bar-Ziv, Eran Beit Ner, Konstantin Lamykin, Ahmad Essa, Ron Gilat, Gilad Livshits, Noam Shohat, Yiftah Beer
Summary: This retrospective study analyzed the outcomes of kinematic alignment total knee arthroplasty (KA-TKA) in valgus knees and compared them to non-valgus knees. The results showed that KA-TKA was effective in relieving pain and improving function in both groups, with slightly better outcomes in the non-valgus group.
JOURNAL OF PERSONALIZED MEDICINE
(2022)
Article
Surgery
Lazaros Kostretzis, Gabriel Bouchard Roby, Sagi Martinov, Marc-Olivier Kiss, Janie Barry, Pascal-Andre Vendittoli
Summary: The study described the technique of performing TKA revision using the restricted KA protocol and reported outcomes. Results showed that the method is safe and effective in the mid-term, with only a small number of cases requiring re-revision.
FRONTIERS IN SURGERY
(2021)
Article
Surgery
Liang Wen, Zhiwei Wang, Desi Ma, Xiaoxiong Zhao
Summary: This study compared the early clinical outcomes of total knee arthroplasty with kinematic alignment using specific instruments versus mechanical alignment. The results showed that the clinical outcomes of kinematic alignment were superior to mechanical alignment up to 2 years after surgery, including clinical performance, knee function, and subjective sensation.
FRONTIERS IN SURGERY
(2023)
Article
Orthopedics
Brandon E. E. Lung, Megan R. Donnelly, Maddison McLellan, Kylie Callan, Arya Amirhekmat, William C. McMaster, Steven Yang, David H. So
Summary: KA patients had shorter LOS (1.8 vs 3.1 days) and less cumulative opioid requirements compared to MA patients (578 vs 1253 MME). On postoperative day 0, KA patients ambulated on average twice the distance of MA patients (20 vs 6.5 feet). KA patients had residual tibia component in varus (1.4 degrees vs -0.3 degrees), femoral component in valgus (-1.9 degrees vs 0.2 degrees), and valgus joint line obliquity compared with MA (-1.5 degrees vs 0.2 degrees). There were no significant differences between 3-month postoperative flexion arc motion, discharge destination, KOOS or SF-12 outcomes, and surgical complication rates between groups.
ORTHOPAEDIC SURGERY
(2023)
Article
Orthopedics
Philip Winnock de Grave, Thomas Luyckx, Tamaya Criekinge, Jacobus Hendrik Mueller, Britt Ollivier, Eduard Eecke, Sally LiArno, Ahmad Faizan, Kurt Claeys
Summary: The purpose was to determine the proportion of native non-arthritic knees that fit within the target zones of three different alignment techniques and estimate the adjustments needed to bring outlier knees within the target zones. The hypothesis was that iKA had a higher proportion of knees within its target zone compared to the other techniques.
KNEE SURGERY SPORTS TRAUMATOLOGY ARTHROSCOPY
(2023)
Article
Orthopedics
Sancar Bakircioglu, Omur Caglar, A. Mazhar Tokgozoglu, Bulent Atilla
Summary: This study analyzed the long-term survival rate and clinical outcomes of a NexGen LPS knee system and investigated the effect of component alignment parameters on clinical scores and patient satisfaction. The results showed that the NexGen LPS-Flex knee system had a satisfactory implant survival rate of 95.1% in 13.2 years, and the fixed bearing design had favorable results. On X-ray evaluations, the presence of two or more outlier components in the same knee led to a deterioration in patient satisfaction and clinical outcomes.
INTERNATIONAL ORTHOPAEDICS
(2022)
Article
Orthopedics
Haoran Lin, Qi Cheng, Guangjian Li, Jie Zhao, Qiang Wang
Summary: This study assessed the functional outcomes of mechanical alignment (MA) and kinematic alignment (KA) procedures in total knee arthroplasty (TKA) patients. The results showed that compared to the MA method, the KA procedure provided pain relief and improved active motion range within 6 weeks after the surgery. Additionally, the KA procedure significantly increased the Knee Disability and Osteoarthritis Outcome Score for Joint Replacement (KOOS JR) at 6 weeks, 6 months, and 1 year post-operation.
JOURNAL OF ORTHOPAEDIC SURGERY AND RESEARCH
(2023)
Article
Orthopedics
Maury L. Hull, Stephen M. Howell
Summary: This study investigated the differences in trochlear morphology between kinematic alignment (KA) and mechanical alignment (MA) methods for a femoral component interfaced with an anatomical patellar prosthesis. The results showed significant differences in the radial location and sulcus angles of the prosthetic trochlea between KA and MA, emphasizing the need to reassess the design of the prosthetic trochlea by multiple manufacturers worldwide.
JOURNAL OF KNEE SURGERY
(2022)
Article
Orthopedics
Stephen M. Howell, Manpreet Gill, Trevor J. Shelton, Alexander J. Nedopil
Summary: The study found that the unrestricted calipered kinematically aligned total knee arthroplasty resulted in a wide range of postoperative phenotypes, without any association with reoperation, implant revision, or lower outcome scores at 4 years. The proportion of TKAs within each phenotype was comparable to those of the nonarthritic contralateral limb.
KNEE SURGERY SPORTS TRAUMATOLOGY ARTHROSCOPY
(2022)
Article
Orthopedics
Alexander J. Nedopil, Tomas Zamora, Connor Delman, Stephen M. Howell, Maury L. Hull
Summary: The study compared the outcomes of using different asymmetric tibial components in kinematically aligned total knee arthroplasty, finding that the asymmetric tibial component with the femoral component target had smaller deviation from the mechanical alignment target and greater coverage of the tibial resection, leading to a lower incidence of cortical overhang.
JOURNAL OF KNEE SURGERY
(2022)
Article
Orthopedics
Connor M. Delman, Delaney Ridenour, Stephen M. Howell, Maury L. Hull
Summary: This study compares the differences in movement between two implants with different insert conformities in total knee arthroplasty, and finds that tibial insert conformity is a determining factor of medial or lateral pivot during deep knee bending.
KNEE SURGERY SPORTS TRAUMATOLOGY ARTHROSCOPY
(2023)
Article
Orthopedics
Alexander J. Nedopil, Peter J. Thadani, Thomas H. McCoy, Stephen M. Howell, Maury L. Hull
Summary: Most medial stabilized total knee arthroplasty implants recommend excision of the posterior cruciate ligament, but this study found that increasing insert thickness and reducing posterior tibial slope cannot correct the loss of internal rotation while also causing extension loss and anterior lift-off.
JOURNAL OF KNEE SURGERY
(2023)
Article
Health Care Sciences & Services
Adithya Shekhar, Stephen M. Howell, Alexander J. Nedopil, Maury L. Hull
Summary: Manipulation under anesthesia (MUA) performed within 6 to 12 weeks after mechanically aligned total knee arthroplasty (TKA) generally leads to better outcomes compared to MUA performed later. However, the timing of MUA after unrestricted, caliper-verified, kinematically aligned (KA) TKA remains uncertain.
JOURNAL OF PERSONALIZED MEDICINE
(2022)
Article
Orthopedics
Stephen M. Howell, Alexander J. Nedopil, Maury L. Hull
Summary: The study compared the accuracy and completion time of femoral resections in total knee arthroplasty (TKA) performed by experienced and less-experienced surgeons using caliper verification. The results showed that experienced surgeons had better accuracy and completed the resections faster.
KNEE SURGERY SPORTS TRAUMATOLOGY ARTHROSCOPY
(2022)
Article
Orthopedics
Maury L. Hull, Stephanie Nicolet-Petersen, Augustine Saiz, Connor Delman, Stephen M. Howell
Summary: An asymmetric tibial baseplate designed for mechanical alignment can cause posterior rim loading in the lateral compartment after unrestricted kinematic alignment TKA. New asymmetric baseplate designs are needed to maximize coverage in kinematic alignment.
KNEE SURGERY SPORTS TRAUMATOLOGY ARTHROSCOPY
(2023)
Article
Health Care Sciences & Services
Alexander J. Nedopil, Stephen M. Howell, Maury L. Hull
Summary: This study evaluated the effects of different levels of congruency in knee arthroplasty inserts. The results showed that adding congruency to the lateral articular surface limits tibial orientation and overtightens the posterior cruciate ligament. These effects can adversely affect the motion and stability of the knee joint.
JOURNAL OF PERSONALIZED MEDICINE
(2022)
Article
Health Care Sciences & Services
Alexander J. Nedopil, Anand Dhaliwal, Stephen M. Howell, Maury L. Hull
Summary: This study aimed to evaluate the learning curve of surgeons after switching to unrestricted kinematic alignment (KA) total knee arthroplasty (TKA) using manual instruments. The results showed that an inexperienced surgeon could determine their learning curve by calculating the deviation of femoral resections and achieve comparable resection accuracy, patient-reported outcome measures (PROMs), and component alignment as an experienced surgeon.
JOURNAL OF PERSONALIZED MEDICINE
(2022)
Article
Biophysics
Abigail E. Niesen, Anna L. Garverick, Stephen M. Howell, Maury L. Hull
Summary: This study tested the reduction of registration error using reverse-engineered (RE) models compared to computer-aided design (CAD) models, and found that RE models showed lower registration errors. Additionally, using RE models instead of CAD models reduced the average registration error by 24%.
JOURNAL OF BIOMECHANICS
(2022)
Article
Orthopedics
Abigail E. Niesen, Anna L. Garverick, Stephen M. Howell, Maury L. Hull
Summary: Low and non-progressive tibial baseplate migration 1 year after unrestricted kinematically aligned total knee arthroplasty should allay any concern that unrestricted kinematically aligned total knee arthroplasty increases risk of baseplate loosening due to varus alignment of the baseplate and limb.
KNEE SURGERY SPORTS TRAUMATOLOGY ARTHROSCOPY
(2023)
Article
Health Care Sciences & Services
Anand Dhaliwal, Tomas Zamora, Alexander J. Nedopil, Stephen M. Howell, Maury L. Hull
Summary: This study found no correlation between the postoperative values of FMA, HKAA, TMA, TSA, PTA, and LUCTR and the clinical outcome scores of KA TKA.
JOURNAL OF PERSONALIZED MEDICINE
(2022)
Article
Health Care Sciences & Services
Elliot Sappey-Marinier, Stephen M. Howell, Alexander J. Nedopil, Maury L. Hull
Summary: This study compared the effects of using different femoral components in mechanically aligned and kinematically aligned total knee arthroplasty on patient outcomes. The results showed that kinematically aligned TKA with a KAd-FC could better improve the alignment of the femoral component, reduce complications, but did not show significant differences compared to MAd-FC.
JOURNAL OF PERSONALIZED MEDICINE
(2022)
Article
Orthopedics
Seow Hui Teo, Teng Khiam Ong, Azhar Mahmood Merican, Muhammad Sufian Hashim, Wuey Min Ng, Mohamed Zubair Mohamed Al-Fayyadh, Mohamed Razif Mohamed Ali
Summary: This study compared the reliabilities between two-dimensional (2-D) and three-dimensional (3-D) methods of measuring TT-TG distance and found that there were no significant differences between the two methods.
INDIAN JOURNAL OF ORTHOPAEDICS
(2023)