Pain and Patellofemoral Functionality in Total Knee Arthroplasty

A Comparative Cohort Study of Two Prosthesis Designs

Luis Miguel Cely, MD; Cesar Hernando Rocha, MD


Curr Orthop Pract. 2021;32(1):53-57. 

In This Article


Knee prostheses have been a solution for patients suffering from knee osteoarthritis.[6] Postsurgical results should be an objective analysis for making the most appropriate decision for each patient when selecting an implant.

We found different comparative studies between two or more types of implants. However, these studies referred to biomechanical and anatomic modifications and usually were made in soft-bone or cadaveric models. On the other hand, the clinical and functional results can offer realistic differences in every category of knee prosthesis. The functional impact in the patients' quality of life can be determined from our surgical results and seen in the results of the functional scales. These scales are available in Spanish and can be used in our daily practice.

The intragroup and intergroup results in terms of pain and functionality, measured with functional scales, between Optetrak PS and Optetrak Logic show that design evolution and mechanical prosthesis improvements correlate with clinical improvements and decreased complication rates.

Limitations and Future Perspectives

This study has the following limitations: first, the newer implants had a shorter mean of follow-up time than the older Optetrak PS design, so follow-up time widely varied between the two patient cohorts. Second, the cohorts were not matched for gender or age, which could affect clinical outcome scores because younger patients tend to reach greater range of motion (ROM) and greater functionality. Further randomized prospective studies are required to determine if our patients can benefit from the most up-to-date patellofemoral designs in Optetrak Logic.