Floating knee: A new prognostic classification

Area of Science:

• Orthopedic Surgery
• Trauma Management
• Medical Classification Systems

Background:

• Floating knee injuries (ipsilateral femur and tibia fractures) often yield poor results despite surgical intervention.
• Existing classifications do not adequately predict prognosis for these complex fractures.
• Factors contributing to poor outcomes include complex fracture patterns, soft tissue compromise, and associated injuries.

Purpose of the Study:

• To validate a novel alphanumeric classification system for floating knee injuries.
• To assess the prognostic value, reliability, and reproducibility of the new classification.
• To compare the proposed system against established classifications (Fraser, Letts and Ran).

Main Methods:

• Retrospective study of 168 patients diagnosed with floating knee between 2014 and 2020.
• Patients were reclassified using the new alphanumeric system, Fraser, and Letts and Ran classifications.
• Statistical analysis using Tau B Kendall and Cohen's Kappa to evaluate prognostic correlation and reliability.

Main Results:

• The new classification system demonstrated a prognostic correlation with functional outcomes.
• The classification effectively categorizes severity based on fracture site and exposure.
• Floating knee is a complex injury associated with generally poor functional results.

Conclusions:

• The proposed classification system is prognostic, reliable, and reproducible for floating knee injuries.
• It offers a more accurate prognostic assessment than existing systems like Fraser's.
• Effective management requires addressing soft tissue and extensor apparatus injuries, not just bone lesions.