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Extension deficit and lateral instability in degenerative disease of the knee

Acta Orthopaedica Scandinavica 51(4): 667-672

Extension deficit and lateral instability in degenerative disease of the knee

Human Marmor knee arthroplastics [70] were performed. The operative procedure provided a good opportunity to study the anatomical conditions in vivo. The causes of extension deficit and lateral instability of the knees were analysed in a prospective investigation. Of 69 knees, 37 had an extension deficit exceeding preoperatively. At operation a bony impediment to extension was found in 32 of these 37 knees, and by removal of this obstruction the extension deficit was relieved in 31 knees. At radiography a bony impediment was demonstrated preoperatively as a cause of an extension deficit in 29 of the 32 knees. No false positive diagnosis was made radiographically. Varus or valgus instability exceeding was observed preoperatively in 42 of the 70 knees. Lateral stability was achieved in all knees at operation by compensating for the intra-articular loss of cartilage and bone with the Marmor module system. Macroscopically intact collateral ligaments were found in all knee joints even in those severely affected by rheumatoid arthritis. All knees except 3 showed lateral stability 1 yr postoperatively.

Accession: 005432786

PMID: 7446057

DOI: 10.3109/17453678008990859

Download PDF Full Text: Extension deficit and lateral instability in degenerative disease of the knee

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