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The knee joint is the most complicated joint in the body. It consists of three articulations– two tibiofemoral and one patellofemoral. As is characteristic of synovial joints, the knee joint has a thin articular capsule that partially surrounds this joint cavity. Additionally, several ligaments, muscles, and cartilaginous structures support the movement of the knee.
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Modern Patellofemoral Arthroplasty.

Elizabeth C Bond1, Taylor P Stauffer2, Stephanie Hendren2

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Patellofemoral arthroplasty (PFA) offers a natural knee function for isolated arthritis but has high revision rates. Modern implants and strict criteria improve outcomes, but long-term data is pending.

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Area of Science:

  • Orthopedic surgery
  • Biomedical engineering

Background:

  • Isolated patellofemoral arthritis presents a surgical challenge.
  • Patellofemoral arthroplasty (PFA) aims to restore knee kinematics while preserving bone, offering an alternative to total knee arthroplasty (TKA).
  • Historically, PFA has a high failure rate, though modern implants and indications show improvement.

Approach:

  • A comprehensive literature review was conducted across four major databases (MEDLINE, Embase, Scopus, SPORTDiscus).
  • Articles were screened for inclusion criteria focusing on indications, outcomes, and techniques for isolated PFA with modern implants.
  • 191 articles were included, encompassing various study types to outline recurrent topics.

Key Points:

  • Modern PFA implants and techniques are improving outcomes and reducing maltracking compared to earlier generations.
  • Strict patient selection and adherence to indications are crucial for optimizing PFA longevity.
  • Technical details in PFA surgery require emphasis to enhance results.

Conclusions:

  • PFA provides a potentially more natural knee function for select patients with isolated patellofemoral arthritis.
  • Further investigation is needed into revision outcomes following PFA and the progression of tibiofemoral osteoarthritis.
  • Long-term data is essential to determine the impact of third-generation implants and improved surgical techniques on PFA revision rates.