The Effect of the Insall-Salvati Ratio on Outcome After Total Knee Arthroplasty

R. Meneghini, Merrill A. Ritter, Jeffery L. Pierson, John B. Meding, Michael E. Berend, Philip M. Faris

Research output: Contribution to journalArticle

48 Citations (Scopus)

Abstract

The effect of total knee arthroplasty (TKA) on the Insall-Salvati ratio (ISR) and the effect of the ISR on the outcome of TKA have not been clearly established. A retrospective review of 1055 primary TKAs performed in 1997 to 1998 was performed. Radiographic measurements were made preoperatively and postoperatively, and the ISR was calculated. Regression analysis was performed to determine the effects of these variables on range of motion (ROM), Knee Society Score, and stair, function, and pain scores. Total knee arthroplasty resulted in a decrease in the patella tendon length, as measured by the ISR in 50% of cases. Patella infera (ISR less than 0.8) developed postoperatively in 9.8% of TKAs and was twice as likely to occur in women as men. A decrease in the ISR was associated with diminished stair and function scores (P = .0004 and 0.0081, respectively). There was no effect of the ISR upon ROM, Knee Society Score, or pain scores. Optimal outcomes occurred in patients where the ISR was not decreased after TKA, with superior stair and function scores.

Original languageEnglish (US)
Pages (from-to)116-120
Number of pages5
JournalJournal of Arthroplasty
Volume21
Issue number6 SUPPL.
DOIs
StatePublished - Sep 2006

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Knee Replacement Arthroplasties
Articular Range of Motion
Pain
Patellar Ligament
Patella
Regression Analysis

Keywords

  • Insall-Salvati ratio
  • outcomes
  • patellar tendon length
  • total knee arthroplasty

ASJC Scopus subject areas

  • Orthopedics and Sports Medicine
  • Surgery

Cite this

Meneghini, R., Ritter, M. A., Pierson, J. L., Meding, J. B., Berend, M. E., & Faris, P. M. (2006). The Effect of the Insall-Salvati Ratio on Outcome After Total Knee Arthroplasty. Journal of Arthroplasty, 21(6 SUPPL.), 116-120. https://doi.org/10.1016/j.arth.2006.04.014

The Effect of the Insall-Salvati Ratio on Outcome After Total Knee Arthroplasty. / Meneghini, R.; Ritter, Merrill A.; Pierson, Jeffery L.; Meding, John B.; Berend, Michael E.; Faris, Philip M.

In: Journal of Arthroplasty, Vol. 21, No. 6 SUPPL., 09.2006, p. 116-120.

Research output: Contribution to journalArticle

Meneghini, R, Ritter, MA, Pierson, JL, Meding, JB, Berend, ME & Faris, PM 2006, 'The Effect of the Insall-Salvati Ratio on Outcome After Total Knee Arthroplasty', Journal of Arthroplasty, vol. 21, no. 6 SUPPL., pp. 116-120. https://doi.org/10.1016/j.arth.2006.04.014
Meneghini, R. ; Ritter, Merrill A. ; Pierson, Jeffery L. ; Meding, John B. ; Berend, Michael E. ; Faris, Philip M. / The Effect of the Insall-Salvati Ratio on Outcome After Total Knee Arthroplasty. In: Journal of Arthroplasty. 2006 ; Vol. 21, No. 6 SUPPL. pp. 116-120.
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