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KMID : 0361620080430020207
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Journal of the Korean Orthopaedic Association
2008 Volume.43 No. 2 p.207 ~ p.212
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The Change of the Posterior Tibial Slope after Cruciate Retaining Total Knee Arthroplasty
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Bae Dae-Kyung
Yoon Kyoung-Ho
Song Sang-Joon
Kim Man-Ho
Noh Jung-Ho
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Abstract
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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® 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±4.8˚ preoperatively and 6.0±2.8˚ postoperatively, and the mean PSA-B was 13.6±4.9˚ preoperatively and 8.1±2.9˚ postoperatively. The difference between the pre- and postoperative PSA increased as the preoperative PSA-A changed from 6.0˚ and the PSA-B changed from 8.1˚; 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 128.0˚ preoperatively and 129.7˚ at the last follow-up.
Conclusion: In cruciate retaining total knee arthroplasty, PSA-A is mostly distributed within 3.2-8.8˚, and a reasonable range of PSA-A is 6.0±2.8˚.
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KEYWORD
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Knee, Posterior tibial slope, Total knee arthroplasty
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