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What is the difference between PFNA and PFNA-2?

Asked by ramadi 

PFNA (Proximal Femoral Nail Antirotaion) system was designed according to the geometric proportions of the White population, and it is known that important differences exist between Asians and Americans with regard to femoral geometry. 

PFNA-II is a specified proximal femoral nail for the treatment of Asian patients. The following adaptations were made to better fit to the small trochanteric area and narrow intramedullary canal of the Asian patients: 
  1. Lateral flat surface to ease insertion and reduce pressure to the lateral cortex.
  2. Higher bending point resulting in a straighter tip part.
  3. Smaller medial-lateral bending (5 degrees vs 6 degrees in PFNA)
  4. Smaller proximal diameter (16.5 mm vs 17 mm in PFNA)
Lateral flat surface and lower medio-lateral bending leads to lower lateral wall impingement and easier insertion in PFNA-II.

Studies have found that PFNA2 avoids impingement on the lateral cortex and lateral fragment. Compared to PFNA, PFNA2 had shorter surgical time, easier nail insertion and higher union rates.