Abstract
Hyperextension deformity is uncommon in arthritic knees undergoing total knee arthroplasty (TKA), occurring in less than 5 % of patients. In a recent study by the authors, the overall incidence of hyperextension in arthritic knees undergoing TKA was 3.9 % (45/1,150 limbs). Hyperextension can be encountered in patients with valgus deformities and excessive ligamentous laxity, in patients with rheumatoid arthritis (RA), in patients post high tibial osteotomy (HTO) and in patients with neuromuscular disorders such as poliomyelitis. The results of our study indicated that the majority of patients with hyperextending, arthritic knees suffered from primary osteoarthritis (78 %) and 58 % of the limbs had an associated preoperative varus deformity compared to 42 % which had a valgus deformity.
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Mullaji, A.B., Shetty, G.M. (2014). Hyperextension Deformity. In: Deformity Correction in Total Knee Arthroplasty. Springer, New York, NY. https://doi.org/10.1007/978-1-4939-0566-9_6
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DOI: https://doi.org/10.1007/978-1-4939-0566-9_6
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