A patient‐specific 3D model of the knee to compare the femoral rollback before and after total knee arthroplasty (TKA)
Abstract Purpose Total knee arthroplasty (TKA) is nowadays performed as a standard procedure on a large number of patients suffering from arthrosis. Replacing the knee joint causes changes in the geometry and kinematics of the knee, which are unique to each individual. This research focuses on the m...
| Main Authors: | , , , , |
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| Format: | Article |
| Language: | English |
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Wiley
2021-01-01
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| Series: | Journal of Experimental Orthopaedics |
| Subjects: | |
| Online Access: | https://doi.org/10.1186/s40634-020-00319-6 |
| _version_ | 1797321244947775488 |
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| author | Alexandra Mercader Timon Röttinger Amir Bigdeli Tim C. Lüth Heinz Röttinger |
| author_facet | Alexandra Mercader Timon Röttinger Amir Bigdeli Tim C. Lüth Heinz Röttinger |
| author_sort | Alexandra Mercader |
| collection | DOAJ |
| description | Abstract Purpose Total knee arthroplasty (TKA) is nowadays performed as a standard procedure on a large number of patients suffering from arthrosis. Replacing the knee joint causes changes in the geometry and kinematics of the knee, which are unique to each individual. This research focuses on the method to detect these changes after TKA and on the impact on the knee movement. This approach could reduce complications in patients with post‐operative pain and reduce the number of revisions. Methods A 3D model of a patient’s knee was made by measuring the movement with a medically certified infrared stereo camera. This measurement was combined with the 3D model of the patient’s bones, previously segmented from the CT scan. This model is printed in 3D, one part being the mechanism that follows the movement of the patient, and the other part being the 3D copy of the femur and tibia bones. The knee replacement operation is performed directly on the model and the resulting rollback is being measured before and after TKA. Results We observe a difference in the rollback before and after TKA on the 3D printed model. The variation in size and shape of the femoral implant compared to the natural femur condyles is one of the reasons for the changes in the rollback effect. The rollback is half as large after the prosthesis insertion, which confirms the fact that the femoral prosthesis geometry influences the knee kinematics. Conclusions In this study, a first 3D model combining the patient‐specific kinematic and the geometry of his bones has been constructed. This model allows the surgeon to validate the plan of the operation, but also to understand the problems and consequences generated by the prosthesis insertion. The rollback is one of the most important motion of the knee joint and this behavior could be quantified, providing comparative analysis of the knee joint before and after the operation. As a future study, the model could be used to analyse more parameters of the TKA such as the impact of different implantation methods. |
| first_indexed | 2024-03-08T04:55:46Z |
| format | Article |
| id | doaj.art-b137521add4740b58389696d2bc361d7 |
| institution | Directory Open Access Journal |
| issn | 2197-1153 |
| language | English |
| last_indexed | 2024-03-08T04:55:46Z |
| publishDate | 2021-01-01 |
| publisher | Wiley |
| record_format | Article |
| series | Journal of Experimental Orthopaedics |
| spelling | doaj.art-b137521add4740b58389696d2bc361d72024-02-07T15:16:41ZengWileyJournal of Experimental Orthopaedics2197-11532021-01-0181n/an/a10.1186/s40634-020-00319-6A patient‐specific 3D model of the knee to compare the femoral rollback before and after total knee arthroplasty (TKA)Alexandra Mercader0Timon Röttinger1Amir Bigdeli2Tim C. Lüth3Heinz Röttinger4Technical University of MunichBoltzmannstraße 1585748Garching bei MünchenGermanyThe Munich Center for ArthroplastyChirurgisches Klinikum München Süd Am Isarkanal 3081379MunichGermanyThe Munich Center for ArthroplastyChirurgisches Klinikum München Süd Am Isarkanal 3081379MunichGermanyTechnical University of MunichBoltzmannstraße 1585748Garching bei MünchenGermanyThe Munich Center for ArthroplastyChirurgisches Klinikum München Süd Am Isarkanal 3081379MunichGermanyAbstract Purpose Total knee arthroplasty (TKA) is nowadays performed as a standard procedure on a large number of patients suffering from arthrosis. Replacing the knee joint causes changes in the geometry and kinematics of the knee, which are unique to each individual. This research focuses on the method to detect these changes after TKA and on the impact on the knee movement. This approach could reduce complications in patients with post‐operative pain and reduce the number of revisions. Methods A 3D model of a patient’s knee was made by measuring the movement with a medically certified infrared stereo camera. This measurement was combined with the 3D model of the patient’s bones, previously segmented from the CT scan. This model is printed in 3D, one part being the mechanism that follows the movement of the patient, and the other part being the 3D copy of the femur and tibia bones. The knee replacement operation is performed directly on the model and the resulting rollback is being measured before and after TKA. Results We observe a difference in the rollback before and after TKA on the 3D printed model. The variation in size and shape of the femoral implant compared to the natural femur condyles is one of the reasons for the changes in the rollback effect. The rollback is half as large after the prosthesis insertion, which confirms the fact that the femoral prosthesis geometry influences the knee kinematics. Conclusions In this study, a first 3D model combining the patient‐specific kinematic and the geometry of his bones has been constructed. This model allows the surgeon to validate the plan of the operation, but also to understand the problems and consequences generated by the prosthesis insertion. The rollback is one of the most important motion of the knee joint and this behavior could be quantified, providing comparative analysis of the knee joint before and after the operation. As a future study, the model could be used to analyse more parameters of the TKA such as the impact of different implantation methods.https://doi.org/10.1186/s40634-020-00319-6Total knee ArthroplastyMechanism designRollback effect |
| spellingShingle | Alexandra Mercader Timon Röttinger Amir Bigdeli Tim C. Lüth Heinz Röttinger A patient‐specific 3D model of the knee to compare the femoral rollback before and after total knee arthroplasty (TKA) Journal of Experimental Orthopaedics Total knee Arthroplasty Mechanism design Rollback effect |
| title | A patient‐specific 3D model of the knee to compare the femoral rollback before and after total knee arthroplasty (TKA) |
| title_full | A patient‐specific 3D model of the knee to compare the femoral rollback before and after total knee arthroplasty (TKA) |
| title_fullStr | A patient‐specific 3D model of the knee to compare the femoral rollback before and after total knee arthroplasty (TKA) |
| title_full_unstemmed | A patient‐specific 3D model of the knee to compare the femoral rollback before and after total knee arthroplasty (TKA) |
| title_short | A patient‐specific 3D model of the knee to compare the femoral rollback before and after total knee arthroplasty (TKA) |
| title_sort | patient specific 3d model of the knee to compare the femoral rollback before and after total knee arthroplasty tka |
| topic | Total knee Arthroplasty Mechanism design Rollback effect |
| url | https://doi.org/10.1186/s40634-020-00319-6 |
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