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Figure 1

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Indices for patella height measuring. (a) Blackburne-Peel index for native knee and modified Blackburne-Peel index for arthroplasty. (b) Modified Insall-Salvati index. (c) Caton-Deschamps index for native knee and derived Caton-Deschamps index for arthroplasty. (d) Modified Caton Deschamps index. Index value = A:B.
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