ArticleKnee surgery & related research2025
Interchangeability of patellar height measurement using the Insall-Salvati ratio at 0° and 30° of knee flexion during weightbearing in total knee arthroplasty.
Article in Knee surgery & related research, 2025. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Cited by 2 papers.
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2 citing papers in PubMed.
- Comparison of Patellofemoral Degeneration After Three Types of High Tibial Osteotomy: Retrotuberosity Biplane Open-Wedge, Supratuberosity Biplane Open-Wedge, and Closed-Wedge Techniques.Orthopaedic journal of sports medicine · 2026Article
- Differential effects of knee flexion on Caton-Deschamps, patellotrochlear and Insall-Salvati indices: A dynamic magnetic resonance imaging-controlled study.Journal of experimental orthopaedics · 2026Article
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3 authors.
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Abstract
purposeTo analyze the correlation and degree of agreement between the patellar heights measured at knee flexion of 0° and 30° before and after total knee arthroplasties (TKA) without patellar resurfacing.
methodsOne hundred primary TKAs with nonresurfaced patella were prospectively evaluated. We measured the Insall-Salvati ratio (ISR), modified ISR (mISR), Blackburne-Peel ratio (BPR), and Caton-Deschamps ratio (CDR) in weightbearing true lateral radiograph at knee flexion of 0° and 30°. The correlations between the patellar height measured at knee flexion of 0° and 30° were analyzed by Pearson correlation analysis. The degree of agreement between the patellar heights in knee flexion angles of 0° and 30° was analyzed using the limits of agreement (LoA) of Bland-Altman analysis; a difference of < ± 0.2 between the measurements at knee flexion of 0° and 30° was deemed clinically acceptable.
resultsVery strong correlations existed between the pre- and postoperative ISR (r = 0.826 and 0.823, p < 0.001, respectively), and the preoperative mISR (r = 0.802, p < 0.001) measured between knee flexion angles of 0° and 30°. Strong correlation was observed in the other pre- and postoperative measurements. The range between upper and lower LoAs of the ISR measured at knee flexion of 0° and 30° was < ± 0.20 preoperatively (-0.174 ~ 0.155) and postoperatively (-0.181 ~ 0.174), while the ranges for all other measurements did not lie within the clinically acceptable range.
conclusionsThe ISR measured at 0° or 30° of knee flexion during weightbearing can be interchanged reasonably before and after TKA. Although knee flexion of 30° is the standard, lateral radiograph of 0° flexion can be a reasonable alternative for evaluating patellar height using the ISR. LEVEL OF EVIDENCE: Level II.
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