Abstract
Introduction
Knee stiffness after total knee arthroplasty (TKA) impairs patient satisfaction and can necessitate mobilisation under anaesthesia (MUA). We investigated what factors predispose towards the need for MUA after TKA.
Patients and methods
The study population was extracted from our local arthroplasty register. Within the setting of a retrospective case/control study, we compared patients who underwent MUA after TKA (n = 35) with a randomly selected control group that did not need MUA after TKA (n = 122) using binary logistic regression analysis.
Results
We found that the risk of MUA due to flexion below 90° was increased in patients suffering from chronic obstructive pulmonary disease (COPD) with a risk ratio (RR) of 12 (95 % confidence interval [CI] 1.7–84, p = 0.01). Increasing age decreased the risk of developing stiffness with a RR of 0.88 (CI 0.81–0.95, p < 0.001) per year. Greater preoperative flexion decreased the risk of stiffness with a RR of 0.97 (CI 0.94–1.0, p = 0.03) per degree of flexion. Gender, body mass index, medical and psychiatric comorbidities, rheumatoid arthritis, the Insall–Salvati index, and the increase in sagittal femoral diameter induced by prosthesis insertion did not significantly affect the risk of stiffness. A certain type of knee prosthesis (Natural Knee 2) was overrepresented among patients requiring MUA.
Discussion and conclusion
We conclude that stiffness after TKA is more frequent in younger patients and in those with limited preoperative flexion. It is also suggested that postoperative stiffness may be associated with COPD and with the choice of certain implants.
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No external funding was received in support of this study.
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The authors declare that they have no competing interests.
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Hailer, N.P., Hänni, M., Widerström, E. et al. Chronic obstructive pulmonary disease, younger age and impaired preoperative flexion increase the risk of stiffness after total knee arthroplasty: a retrospective case–control study. Eur Orthop Traumatol 4, 137–145 (2013). https://doi.org/10.1007/s12570-013-0169-3
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DOI: https://doi.org/10.1007/s12570-013-0169-3