The Change of the Posterior Tibial Slope after Cruciate Retaining Total Knee Arthroplasty.
10.4055/jkoa.2008.43.2.207
- Author:
Dae Kyung BAE
1
;
Kyoung Ho YOON
;
Sang Jun SONG
;
Jung Ho NOH
;
Man Ho KIM
Author Information
1. Department of Orthopedic Surgery, School of Medicine, Kyung Hee University, Seoul, Korea. bdkyung@khmc.or.kr
- Publication Type:Original Article
- Keywords:
Knee;
Posterior tibial slope;
Total knee arthroplasty
- MeSH:
Arthroplasty;
Follow-Up Studies;
Humans;
Knee;
Knee Joint;
Linear Models;
Range of Motion, Articular
- From:The Journal of the Korean Orthopaedic Association
2008;43(2):207-212
- CountryRepublic of Korea
- Language:Korean
-
Abstract:
PURPOSE: To analyze the pre- and postoperative posterior tibial slope angle (PSA) of performing cruciate-retaining total knee arthroplasty (TKA) and to identify the ideal value of the PSA in relation to the clinical results. MATERIALS AND METHODS: From June 1999 to May 2005, 202 TKA with a NexGen(R) cruciate-retaining knee were performed in 160 patients. The mean follow-up period was 39.8 months. The pre- and postoperative PSA referenced by the proximal tibial medullary canal (PSA-A) and the proximal tibial anterior cortex (PSA-B) were measured by two independent observers. The knee and function scoring system of the American Knee Society and the range of motion of the knee at the last follow-up were evaluated as the clinical results. RESULTS: The mean PSA-A was 11.4+/-4.8degrees preoperatively and 6.0+/-2.8degrees postoperatively, and the mean PSA-B was 13.6+/-4.9degrees preoperatively and 8.1+/-2.9degrees postoperatively. The difference between the pre- and postoperative PSA increased as the preoperative PSA-A changed from 6.0degrees and the PSA-B changed from 8.1degrees; these findings showed statistical significance based on a simple linear regression (PSA-A: r= 0.837, p=0.000; PSA-B: r=0.834, p=0.000). The knee and function score of American Knee Society improved respectively from 62.9 and 55.8, preoperatively, to 97.4 and 89.7 respectively, at the last follow-up. The range of motion of the knee joint was 128.0degrees preoperatively and 129.7degrees at the last follow-up. CONCLUSION: In cruciate retaining total knee arthroplasty, PSA-A is mostly distributed within 3.2-8.8degrees, and a reasonable range of PSA-A is 6.0+/-2.8degrees.
