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- Title
Mid-flexion laxity in the asymptomatic native knee is predominantly present on the lateral side.
- Authors
te Molder, Malou E. M.; Wymenga, Ate B.; Heesterbeek, Petra J. C.
- Abstract
<bold>Purpose: </bold>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.<bold>Methods: </bold>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.<bold>Results: </bold>Varus laxity in mid-flexion was higher than in extension and flexion (p < 0.01). Valgus laxity tended to be highest in mid-flexion laxity; however, no differences in knee laxity between flexion angles were seen (n.s.). Varus knee laxity in extension was higher in females than in males (p < 0.05).<bold>Conclusions: </bold>Mid-flexion laxity in the native knee is more prominent on the lateral side of the knee, while the medial side is more stable and constrained. Varus knee laxity in extension was shown to be higher in females than in males.<bold>Level Of Evidence: </bold>Prognostic Level II.
- Subjects
TOTAL knee replacement; JOINT hypermobility; BODY mass index; STRESS radiography; KNEE surgery
- Publication
Knee Surgery, Sports Traumatology, Arthroscopy, 2019, Vol 27, Issue 11, p3614
- ISSN
0942-2056
- Publication type
journal article
- DOI
10.1007/s00167-019-05474-7