Mid-flexion laxity in the asymptomatic native knee is predominantly present on the lateral side

Purpose During total knee arthroplasty (TKA), an orthopaedic surgeon is focused on soft-tissue balance in extension (0°) and in flexion (90°). Patients with instability problems of the knee often report a feeling of instability during daily life activities, at around 30° knee flexion. There are no r...

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Bibliographic Details
Published in:Knee surgery, sports traumatology, arthroscopy : official journal of the ESSKA sports traumatology, arthroscopy : official journal of the ESSKA, 2019-11, Vol.27 (11), p.3614-3625
Main Authors: te Molder, Malou E. M., Wymenga, Ate B., Heesterbeek, Petra J. C.
Format: Article
Language:English
Subjects:
Aged
Arthroplasty (knee)
Arthroplasty, Replacement, Knee
Biomedical materials
Body mass
Cross-Sectional Studies
Female
Females
Humans
Joint Instability - diagnostic imaging
Joint Instability - physiopathology
Joint Instability - surgery
Joint surgery
Knee
Knee Joint - diagnostic imaging
Knee Joint - physiology
Knee Joint - physiopathology
Knee Joint - surgery
Male
Males
Medicine
Medicine & Public Health
Middle Aged
Orthopedics
Radiographs
Radiography
Range of Motion, Articular
Reference Values
Sex differences
Stability
Surgical implants
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Summary:Purpose During total knee arthroplasty (TKA), an orthopaedic surgeon is focused on soft-tissue balance in extension (0°) and in flexion (90°). Patients with instability problems of the knee often report a feeling of instability during daily life activities, at around 30° knee flexion. There are no reference values available for knee laxity of healthy subjects in mid-flexion (30°) and flexion (90°) for comparison with the TKA population. Therefore, the aim was to quantify varus and valgus knee laxity in extension, mid-flexion and flexion in the asymptomatic native knee. Methods In 40 healthy volunteers matched for age, gender and BMI with the TKA-population, varus and valgus knee laxity in extension (0°), mid-flexion (30°) and flexion (90°) was measured on low-dose radiographs. For each subject, one randomly selected knee was stressed in extension, mid-flexion and flexion (with 15 Nm) using a stress device. Results Varus laxity in mid-flexion was higher than in extension and flexion ( p  
ISSN:0942-2056
1433-7347
DOI:10.1007/s00167-019-05474-7