Application of different patella height indices in patients undergoing total knee arthroplasty
Abstract Background One complication of total knee arthroplasty (TKA) is patella baja (PB). Patellar tendon shortening and joint line elevation are two main causes of PB. The purpose of this study was to determine the incidence of PB before and after TKA by measuring the patellar height and provide...
| Main Authors: | , , , , , |
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| Format: | Article |
| Language: | English |
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BMC
2017-12-01
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| Series: | Journal of Orthopaedic Surgery and Research |
| Subjects: | |
| Online Access: | http://link.springer.com/article/10.1186/s13018-017-0694-9 |
| _version_ | 1798005532997451776 |
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| author | Bin Xu Wei-xing Xu Di Lu Hong-feng Sheng Xin-wei Xu Wei-guo Ding |
| author_facet | Bin Xu Wei-xing Xu Di Lu Hong-feng Sheng Xin-wei Xu Wei-guo Ding |
| author_sort | Bin Xu |
| collection | DOAJ |
| description | Abstract Background One complication of total knee arthroplasty (TKA) is patella baja (PB). Patellar tendon shortening and joint line elevation are two main causes of PB. The purpose of this study was to determine the incidence of PB before and after TKA by measuring the patellar height and provide evidence for choosing a suitable index. Methods In total, 256 consecutive patients who underwent primary TKA were included in this study. Radiographic measurements were performed; the Insall–Salvati (IS) index, modified IS (MIS) index, Blackburne–Peel (BP) index, and Caton–Deschamps (CD) index were computed; and the incidence of PB was calculated before and after the operation. The consistency between the IS and MIS indices and between the BP and CD indices was analyzed. Results The preoperative incidence of true PB (TPB) and pseudo-PB (PPB) was 9.4 and 0.8%, respectively. The postoperative incidence of TPB and PPB was 10.2 and 9.0%, respectively. The consistency between the IS and MIS indices was moderate preoperatively (pre-kappa = 0.602) and postoperatively (post-kappa = 0.742). The consistency between the BP and CD indices was moderate preoperatively (pre-kappa = 0.742) and good postoperatively (post-kappa = 0.797). Conclusion The incidence of PB, especially PPB, increased after TKA. The CD and BP indices are of greater importance for the diagnosis of PB after TKA. The MIS index is a better choice than the IS index to measure the length of the patellar tendon. To measure the height of the joint line, the BP index is better postoperatively and the CD index is better preoperatively. |
| first_indexed | 2024-04-11T12:40:47Z |
| format | Article |
| id | doaj.art-3920fd28645a41a794455953265e86c8 |
| institution | Directory Open Access Journal |
| issn | 1749-799X |
| language | English |
| last_indexed | 2024-04-11T12:40:47Z |
| publishDate | 2017-12-01 |
| publisher | BMC |
| record_format | Article |
| series | Journal of Orthopaedic Surgery and Research |
| spelling | doaj.art-3920fd28645a41a794455953265e86c82022-12-22T04:23:30ZengBMCJournal of Orthopaedic Surgery and Research1749-799X2017-12-011211610.1186/s13018-017-0694-9Application of different patella height indices in patients undergoing total knee arthroplastyBin Xu0Wei-xing Xu1Di Lu2Hong-feng Sheng3Xin-wei Xu4Wei-guo Ding5Department of Orthopaedics, Tongde Hospital of Zhejiang ProvinceDepartment of Orthopaedics, Tongde Hospital of Zhejiang ProvinceDepartment of Orthopaedics, Tongde Hospital of Zhejiang ProvinceDepartment of Orthopaedics, Tongde Hospital of Zhejiang ProvinceDepartment of Orthopaedics, Tongde Hospital of Zhejiang ProvinceDepartment of Orthopaedics, Tongde Hospital of Zhejiang ProvinceAbstract Background One complication of total knee arthroplasty (TKA) is patella baja (PB). Patellar tendon shortening and joint line elevation are two main causes of PB. The purpose of this study was to determine the incidence of PB before and after TKA by measuring the patellar height and provide evidence for choosing a suitable index. Methods In total, 256 consecutive patients who underwent primary TKA were included in this study. Radiographic measurements were performed; the Insall–Salvati (IS) index, modified IS (MIS) index, Blackburne–Peel (BP) index, and Caton–Deschamps (CD) index were computed; and the incidence of PB was calculated before and after the operation. The consistency between the IS and MIS indices and between the BP and CD indices was analyzed. Results The preoperative incidence of true PB (TPB) and pseudo-PB (PPB) was 9.4 and 0.8%, respectively. The postoperative incidence of TPB and PPB was 10.2 and 9.0%, respectively. The consistency between the IS and MIS indices was moderate preoperatively (pre-kappa = 0.602) and postoperatively (post-kappa = 0.742). The consistency between the BP and CD indices was moderate preoperatively (pre-kappa = 0.742) and good postoperatively (post-kappa = 0.797). Conclusion The incidence of PB, especially PPB, increased after TKA. The CD and BP indices are of greater importance for the diagnosis of PB after TKA. The MIS index is a better choice than the IS index to measure the length of the patellar tendon. To measure the height of the joint line, the BP index is better postoperatively and the CD index is better preoperatively.http://link.springer.com/article/10.1186/s13018-017-0694-9Total knee arthroplastyRadiographic measurementPatella bajaConsistency test |
| spellingShingle | Bin Xu Wei-xing Xu Di Lu Hong-feng Sheng Xin-wei Xu Wei-guo Ding Application of different patella height indices in patients undergoing total knee arthroplasty Journal of Orthopaedic Surgery and Research Total knee arthroplasty Radiographic measurement Patella baja Consistency test |
| title | Application of different patella height indices in patients undergoing total knee arthroplasty |
| title_full | Application of different patella height indices in patients undergoing total knee arthroplasty |
| title_fullStr | Application of different patella height indices in patients undergoing total knee arthroplasty |
| title_full_unstemmed | Application of different patella height indices in patients undergoing total knee arthroplasty |
| title_short | Application of different patella height indices in patients undergoing total knee arthroplasty |
| title_sort | application of different patella height indices in patients undergoing total knee arthroplasty |
| topic | Total knee arthroplasty Radiographic measurement Patella baja Consistency test |
| url | http://link.springer.com/article/10.1186/s13018-017-0694-9 |
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