TY - JOUR
T1 - Influence of Patella Height on Total Knee Arthroplasty
T2 - Outcomes and Survival
AU - Gaillard, Romain
AU - Bankhead, Christopher
AU - Budhiparama, Nicolaas
AU - Batailler, Cécile
AU - Servien, Elvire
AU - Lustig, Sébastien
N1 - Publisher Copyright:
© 2018 Elsevier Inc.
PY - 2019/3
Y1 - 2019/3
N2 - Background: The aim of this study is to assess clinical results of total knee arthroplasty (TKA) with pre-operative patella alta or patella baja, compared to TKA with pre-operative normal patellar height. Methods: Patella height was measured using the Blackburne-Peel (BP) method in an initial, prospective cohort of 4103 TKAs performed at a single center. Three groups were defined: normal patella height (0.54 < BP index ≤ 1.06), patella alta (BP index >1.06), and patella baja (BP index ≤0.54). Pre-operative and post-operative clinical and radiological characteristics were collected and compared. All prostheses used a system of posterior stabilization by a third condyle. The primary outcome measure was the post-operative Knee Society Score. Statistical analysis was performed using Student's t-test and chi-squared test, with P <.05. Results: Two hundred twenty-three TKAs with pre-operative patella alta, 307 TKAs with pre-operative patella baja, and 2248 with pre-operative normal patella height, mean follow-up 39.3 months (range 24-239), were ultimately included. Post-operatively, there was no difference between the 3 groups in terms of Knee Society Score (knee and function scores). Patella baja statistically decreased the maximal flexion (118.2° vs 115.5° P =.002) and increased the rate of patellar fracture (0.9% vs 2%, P =.05). Finally, survival rates were similar in the 3 groups with each above 91% (±2%) at 10 years. Conclusion: Clinical and radiological results for TKAs with pre-operative patella alta and patella baja were comparable to TKAs with a normal pre-operative patellar height. Risk of post-operative patellar fracture increased for patients with pre-operative patella baja.
AB - Background: The aim of this study is to assess clinical results of total knee arthroplasty (TKA) with pre-operative patella alta or patella baja, compared to TKA with pre-operative normal patellar height. Methods: Patella height was measured using the Blackburne-Peel (BP) method in an initial, prospective cohort of 4103 TKAs performed at a single center. Three groups were defined: normal patella height (0.54 < BP index ≤ 1.06), patella alta (BP index >1.06), and patella baja (BP index ≤0.54). Pre-operative and post-operative clinical and radiological characteristics were collected and compared. All prostheses used a system of posterior stabilization by a third condyle. The primary outcome measure was the post-operative Knee Society Score. Statistical analysis was performed using Student's t-test and chi-squared test, with P <.05. Results: Two hundred twenty-three TKAs with pre-operative patella alta, 307 TKAs with pre-operative patella baja, and 2248 with pre-operative normal patella height, mean follow-up 39.3 months (range 24-239), were ultimately included. Post-operatively, there was no difference between the 3 groups in terms of Knee Society Score (knee and function scores). Patella baja statistically decreased the maximal flexion (118.2° vs 115.5° P =.002) and increased the rate of patellar fracture (0.9% vs 2%, P =.05). Finally, survival rates were similar in the 3 groups with each above 91% (±2%) at 10 years. Conclusion: Clinical and radiological results for TKAs with pre-operative patella alta and patella baja were comparable to TKAs with a normal pre-operative patellar height. Risk of post-operative patellar fracture increased for patients with pre-operative patella baja.
KW - Blackburne-Peel index
KW - KSS
KW - patella alta
KW - patella baja
KW - total knee arthroplasty
UR - http://www.scopus.com/inward/record.url?scp=85057139680&partnerID=8YFLogxK
U2 - 10.1016/j.arth.2018.10.037
DO - 10.1016/j.arth.2018.10.037
M3 - Article
C2 - 30497900
AN - SCOPUS:85057139680
SN - 0883-5403
VL - 34
SP - 469
EP - 477
JO - Journal of Arthroplasty
JF - Journal of Arthroplasty
IS - 3
ER -