Predictors of early aseptic loosening of prosthetic components following primary total knee arthroplasty

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Abstract

Background. Aseptic loosening of the knee prosthesis components is one of the most common causes of revision surgery. The acceptable range of angular values for postoperative alignment of the lower limb and the frontal positioning of the prosthetic components remains a subject of debate.

The aim of the study — to identify the predictors of the early aseptic loosening of prosthetic components following primary total knee arthroplasty.

Methods. The study group included 31 patients with aseptic loosening of prosthetic components. The comparison group consisted of 55 patients with no signs of loosening over a follow-up period of at least 8 years. Baseline characteristics (sex, age, body mass index, and operated side) were compared, along with preoperative and postoperative angular alignment of the lower limbs, specifically, the anatomical femorotibial angle (aFTA) and the hip-knee-ankle angle (HKA), as well as reference angles for prosthetic component positioning.

Results. Patient age over 60.5 years and BMI over 27.5 were associated with a 2.9-fold and 2.6-fold increased risk of prosthetic loosening, respectively. Preoperative varus deformity, with an HKA angle exceeding 9.5° and an aFTA over 6.5°, increased the risk of loosening by 9.6 and 23.1 times, respectively. Postoperative residual deformity exceeding 0.5° in either direction, as measured by the aFTA, increased the risk of loosening by 8.7 times. Valgus positioning of the tibial component was associated with a 2.8-fold increased risk of component loosening.

Conclusions. In elderly and overweight patients with pronounced varus deformity of the lower limb, personalized preoperative planning should be prioritized to prevent early aseptic loosening of prosthetic components. In cases where postoperative residual deformity or valgus positioning of the tibial component is detected, enhanced clinical follow-up with radiographic monitoring every 6 months is recommended. If radiolucent lines progress and pain is present, early consideration of revision surgery is advisable, as it may increase the likelihood of a successful conservative revision.

About the authors

Mikhail B. Gurazhev

Tsivyan Novosibirsk Research Institute of Traumatology and Orthopedics

Author for correspondence.
Email: Tashtagol@inbox.ru
ORCID iD: 0000-0002-6398-9413
Russian Federation, Novosibirsk

Vitaliy L. Lukinov

Tsivyan Novosibirsk Research Institute of Traumatology and Orthopedics

Email: vitaliy.lukinov@gmail.com
ORCID iD: 0000-0002-3411-508X

Cand. Sci. (Phys.-Math.)

Russian Federation, Novosibirsk

Vladislav S. Baitov

Tsivyan Novosibirsk Research Institute of Traumatology and Orthopedics

Email: VBaitov@list.ru
ORCID iD: 0000-0002-9427-7072

Cand. Sci. (Med.)

Russian Federation, Novosibirsk

Anton S. Gofer

Tsivyan Novosibirsk Research Institute of Traumatology and Orthopedics

Email: a.hofer.ortho@gmail.com
ORCID iD: 0009-0000-3886-163X
Russian Federation, Novosibirsk

Evgeniy A. Ivanov

Tsivyan Novosibirsk Research Institute of Traumatology and Orthopedics

Email: Ivanov.evgeniy90@bk.ru
ORCID iD: 0009-0007-8429-282X
Russian Federation, Novosibirsk

Vitaliy V. Pavlov

Tsivyan Novosibirsk Research Institute of Traumatology and Orthopedics

Email: pavlovdoc@mail.ru
ORCID iD: 0000-0002-8997-7330

Dr. Sci. (Med.), Associate Professor

Russian Federation, Novosibirsk

Andrey A. Korytkin

Tsivyan Novosibirsk Research Institute of Traumatology and Orthopedics

Email: andrey.korytkin@gmail.com
ORCID iD: 0000-0001-9231-5891

Cand. Sci. (Med.)

Russian Federation, Novosibirsk

Aleksandr A. Pronskikh

Tsivyan Novosibirsk Research Institute of Traumatology and Orthopedics

Email: proal_88@mail.ru
ORCID iD: 0000-0003-1197-556X
Scopus Author ID: 6503950260

Dr. Sci. (Med.)

Russian Federation, Novosibirsk

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Supplementary files

Supplementary Files
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1. JATS XML
2. Figure 1. Flow-chart of patient selection

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3. Figure 2. CPAK classification for coronal lower limb alignment [8]

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4. Figure 3. Preoperative distribution graph of the knee joint phenotypes among patients

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5. Figure 4. Postoperative distribution graph of the knee joint phenotypes among patients

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6. Figure 5. ROC curve (threshold value 55.1%) of the multivariate model for predicting loosening of prosthetic components

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