Patella baja after revision total knee arthroplasty

详细信息    查看全文

• 作者：Hongsen Chiang ; Ching-Chuan Jiang ; ^{ccj@ntu.edu.tw}
• 关键词：patella baja ; total knee arthroplasty
• 刊名：Formosan Journal of Musculoskeletal Disorders
• 出版年：2010
• 出版时间：November 2010
• 年：2010
• 卷：1
• 期：1
• 页码：11-15
• 全文大小：305 K

文摘

Background

Patella baja happens after revision total knee arthroplasty (TKA), by patellar ligament shortening and/or elevated joint line (¡°pseudo?patella baja), and may restrict knee flexion.

Methods

We studied 29 revision TKA of the same surgical procedure and type of prosthesis with an average follow-up of 28.3 months.

Results

At the last follow-up, patella baja was found in 59 % , 83 % , and 90 % of patients, as defined by Insall-Salvati (IS), Blackburne-Peel, and Caton-Deschamps indexes, respectively. Higher incidence by the latter two indexes indicated existence of pseudo patella baja. Mean maximal flexion angle was 95.5¡ã, poorly correlated with any of the three indexes by linear regression. Mean maximal flexion angle of IS index-defined patella baja knees (97.9¡ã) was not significantly different from that of the nonbaja knees (92.1¡ã). Mean IS index significantly decreased after surgery (0.82?.78), but joint line position did not change significantly.

Conclusion

Both true and pseudo patella baja could exist after revision TKA but would not restrict knee flexion.