Clinical Outcomes after Total Knee Replacement in Dependence on Femoral Component Rotation Relative to the Original Anatomy of Distal Femur

Result code in IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F00216224%3A14110%2F20%3A00116598" target="_blank" >RIV/00216224:14110/20:00116598 - isvavai.cz</a>

Result on the web

<a href="http://www.achot.cz/detail.php?stat=1113" target="_blank" >http://www.achot.cz/detail.php?stat=1113</a>

DOI - Digital Object Identifier

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Result language

čeština

Original language name

Klinické výsledky po totální náhradě kolenního kloubu v závislosti na rotaci femorální komponenty vzhledem k původním anatomickým poměrům na distálním femuru

Original language description

PURPOSE OF THE STUDY The number of patients who underwent total knee replacement is on an increase globally. According to the current literature, 10-30% of patients is dissatisfied with the outcome of surgery. The purpose of this study was to focus on preoperative planning of femoral components position relative to the original anatomy and to find out how it affects the satisfaction of patients after the surgery. MATERIAL AND METHODS A total of 74 total knee replacements were examined at the authors' department one year after the surgery in order to determine the function of knee replacement. The patients underwent a preoperative and postoperative CT scan of the knee joint in order to determine the rotation of the dorsal line of femoral condyles relative to the transepicondylar line, the so-called condylar twist angle (CTA). The study did not explore the absolute value of CTA, but the difference between the preoperative and postoperative angle. The patients were divided into two groups. In Group 1 composed of 53 knees, the difference of the CTA was lower than 3 degrees, Group 2 included the cases with the difference greater than 3 degrees. After 1 year, the patients filled in the Knee Society Clinical Rating Score and WOMAC questionnaires. The statistical significance was evaluated with the use of the unpaired T-test. RESULTS Group 1 where the original anatomy of the knee joint was respected, reported the mean value of Part 1 of the KSCRS of 83.5 points, the mean value of Part 2 of this questionnaire was 83.5 points. The mean WOMAC score was 86.4 and the mean VAS score was 2.6. In Group 2, with a difference in rotation as against the preoperative status of 3 degrees or more, the mean value of Part 1 and Part 2 of the KSRCS was 72.4 points and 72.1 points, respectively, the mean WOMAC score was 75.5 points and the mean VAS score was 4.7. The comparison by the Student's t-test, in all the monitored values at the level of significance of p &lt; 0.05 the patients' satisfaction and the implant's function depend on respecting the original anatomy of the distal femur. DISCUSSION It is generally accepted that the internal rotation of the femoral component causes patellar hyperpression, thus reduces the satisfaction of patients. There are several ways how to determine the rotation of the femoral component. An error is inherent in all of them, inversely proportional to the surgeon's experience. The purpose of our study was to show that in case of appropriately selected preoperative planning the postoperative outcome and the patients' satisfaction can improve. CONCLUSIONS Our study confirms that for the patient's satisfaction after total knee replacement it is fitting to perform preoperative planning regarding the rotation of the femoral component and to seek to maintain the original anatomy, even if the femoral component is implanted in slight internal rotation.

Czech name

Klinické výsledky po totální náhradě kolenního kloubu v závislosti na rotaci femorální komponenty vzhledem k původním anatomickým poměrům na distálním femuru

Czech description

PURPOSE OF THE STUDY The number of patients who underwent total knee replacement is on an increase globally. According to the current literature, 10-30% of patients is dissatisfied with the outcome of surgery. The purpose of this study was to focus on preoperative planning of femoral components position relative to the original anatomy and to find out how it affects the satisfaction of patients after the surgery. MATERIAL AND METHODS A total of 74 total knee replacements were examined at the authors' department one year after the surgery in order to determine the function of knee replacement. The patients underwent a preoperative and postoperative CT scan of the knee joint in order to determine the rotation of the dorsal line of femoral condyles relative to the transepicondylar line, the so-called condylar twist angle (CTA). The study did not explore the absolute value of CTA, but the difference between the preoperative and postoperative angle. The patients were divided into two groups. In Group 1 composed of 53 knees, the difference of the CTA was lower than 3 degrees, Group 2 included the cases with the difference greater than 3 degrees. After 1 year, the patients filled in the Knee Society Clinical Rating Score and WOMAC questionnaires. The statistical significance was evaluated with the use of the unpaired T-test. RESULTS Group 1 where the original anatomy of the knee joint was respected, reported the mean value of Part 1 of the KSCRS of 83.5 points, the mean value of Part 2 of this questionnaire was 83.5 points. The mean WOMAC score was 86.4 and the mean VAS score was 2.6. In Group 2, with a difference in rotation as against the preoperative status of 3 degrees or more, the mean value of Part 1 and Part 2 of the KSRCS was 72.4 points and 72.1 points, respectively, the mean WOMAC score was 75.5 points and the mean VAS score was 4.7. The comparison by the Student's t-test, in all the monitored values at the level of significance of p &lt; 0.05 the patients' satisfaction and the implant's function depend on respecting the original anatomy of the distal femur. DISCUSSION It is generally accepted that the internal rotation of the femoral component causes patellar hyperpression, thus reduces the satisfaction of patients. There are several ways how to determine the rotation of the femoral component. An error is inherent in all of them, inversely proportional to the surgeon's experience. The purpose of our study was to show that in case of appropriately selected preoperative planning the postoperative outcome and the patients' satisfaction can improve. CONCLUSIONS Our study confirms that for the patient's satisfaction after total knee replacement it is fitting to perform preoperative planning regarding the rotation of the femoral component and to seek to maintain the original anatomy, even if the femoral component is implanted in slight internal rotation.

Type

J_imp - Article in a specialist periodical, which is included in the Web of Science database

CEP classification

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OECD FORD branch

30211 - Orthopaedics

Project

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Continuities

I - Institucionalni podpora na dlouhodoby koncepcni rozvoj vyzkumne organizace

Publication year

2020

Confidentiality

S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů

Name of the periodical

Acta chirurgiae orthopaedicae et traumatologiae čechoslovaca

ISSN

0001-5415

e-ISSN

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Volume of the periodical

87

Issue of the periodical within the volume

2

Country of publishing house

CZ - CZECH REPUBLIC

Number of pages

7

Pages from-to

75-81

UT code for WoS article

000540875000001

EID of the result in the Scopus database

2-s2.0-85164407422