Changes in patellar alignment after total knee arthroplasty.

Area of Science:

• Orthopedic Surgery
• Biomechanical Engineering

Background:

• Patellofemoral joint complications remain a challenge after total knee arthroplasty (TKA).
• Understanding factors influencing patellar alignment is crucial for improving TKA outcomes.

Purpose of the Study:

• To investigate factors affecting patellar alignment post-TKA.
• To analyze changes in patellar alignment over a 5.3-year follow-up period.
• To identify surgical techniques that reduce patellofemoral complications.

Main Methods:

• Prospective study of 56 knees undergoing TKA.
• Assessment of patellar alignment and femorotibial alignment.
• Evaluation of patellar resection technique and patellar remnant thickness.
• Longitudinal follow-up for clinical complications and revision rates.

Main Results:

• Average patellar alignment was acceptable with no clinical complications or revisions.
• Patellar resection angle significantly influenced postoperative patellar alignment.
• Medial thinning of the patellar remnant correlated with increased lateral tilt, potentially requiring lateral retinacular release.
• Postoperative varus alignment showed a tendency towards increased patellar lateral tilt.

Conclusions:

• Surgeons must meticulously manage femorotibial alignment and patellar preparation during TKA.
• Attention to patellar resection angle and remnant thickness can mitigate patellofemoral complications.
• Optimizing alignment strategies is key to enhancing TKA success and patient satisfaction.