Observations on patellar height after proximal tibial osteotomy.

Area of Science:

• Orthopedic surgery
• Biomechanics
• Radiology

Background:

• Proximal tibial osteotomy is a surgical procedure to correct knee deformities.
• Patellar height is a critical factor in knee biomechanics and function.
• Postoperative changes in patellar height after osteotomy require investigation.

Purpose of the Study:

• To evaluate alterations in patellar height following proximal tibial osteotomy.
• To identify potential causes for observed changes in patellar height.
• To determine if postoperative patellar height influences the need for total knee replacement.

Main Methods:

• Retrospective evaluation of 66 knees from 60 patients who underwent proximal tibial osteotomy.
• Measurement of patellar height using the Insall-Salvati index and the Blackburne-Peel index on postoperative lateral radiographs.
• Analysis of correlation between patellar height and subsequent revision surgery.

Main Results:

• A significant proportion of patellae were observed to be lower postoperatively: 89% by Insall-Salvati index and 76.3% by Blackburne-Peel index.
• Potential contributing factors include patellar ligament shortening from immobilization, scarring, and new bone formation.
• No correlation was found between postoperative patellar height and the requirement for total knee replacement revision.

Conclusions:

• Proximal tibial osteotomy is frequently associated with a decrease in patellar height.
• Ligamentous and bony changes post-surgery likely contribute to patellar height alteration.
• Postoperative patellar height does not appear to be a predictor for future total knee replacement.