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Archives of Orthopaedic and Trauma Surgery

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01-01-2014 | Knee Arthroplasty

Alteration of the patellar height following total knee arthroplasty

Authors: A. Jawhar, S. Sohoni, V. Shah, H. P. Scharf

Published in: Archives of Orthopaedic and Trauma Surgery | Issue 1/2014

Abstract

Introduction

Patellofemoral related complications after total knee arthroplasty (TKA) remain clinically relevant. The hypothesis of the present study was that the patellar height changes more than 10 % of its preoperative height after TKA. Possible influences of age, gender, side and navigation system on patellar height were evaluated separately in subgroups.

Materials and methods

A total of 107 knees were enrolled after primary TKA. The patellar height was determined for each patient preoperatively, 1 week and 1 year postoperatively on routinely performed standing lateral view radiographs at 30° knee flexion. Insall–Salvati index (ISI), modified Insall–Salvati index (MIS) as well as Miura–Kawamura index (MKI) were determined for the whole cohort.

Results

One week after TKA the ISI, MIS and MKI changed by more than 10 % in 24 (22 %), 33 (30 %) and 54 (50 %) cases, respectively. Moreover, the 1 year follow-up revealed a decrease or increase of ISI in 30 (28 %), MIS in 47 (44 %) and MK in 65 (61 %) knees. The frequency of patella alta, norma and baja preoperatively as well as 1 week and 1 year postoperatively were not significantly different. Significant differences of patellar height changes were not noted between the defined subgroups.

Conclusions

The present study demonstrates that TKA leads, at 1 week and 1 year follow-up, to patellar height alteration more than 10 % in a significant number of knee joints. However, with the use of ISI and MIS the changes of patellar height did not exceed the defined thresholds to be classified as patella alta or baja.

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Title: Alteration of the patellar height following total knee arthroplasty
Authors: A. Jawhar
S. Sohoni
V. Shah
H. P. Scharf
Publication date: 01-01-2014
Publisher: Springer Berlin Heidelberg
Published in: Archives of Orthopaedic and Trauma Surgery / Issue 1/2014
Print ISSN: 0936-8051
Electronic ISSN: 1434-3916
DOI: https://doi.org/10.1007/s00402-013-1896-1

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Alteration of the patellar height following total knee arthroplasty

Abstract

Introduction

Materials and methods

Results

Conclusions

Keynote webinar | Spotlight on sleep in brain health

Springer Medicine

Abstract

Introduction

Materials and methods

Results

Conclusions

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