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Seinsheimer’s Classification of Subtrochanteric Frxs

- Type I:
     - nondisplaced frx: < 2 mm of displacement of frx frags;

- Type II: two part fractures:
     - IIA: Two part transverse femoral fracture;
     - IIB: Two part spiral frx w/ lesser troch attached to prox frag;
     - IIC: Two part spiral frx w/ lesser troch attached to distal fragment;

- Type III: three part fractures:
     - IIIA:
          - three part spiral frx in which lesser troch is part of 3rd frag, which has an inferior spike of cortex of varying length;
          - implant failures and non-unions are common;
     - IIIB:
          - three part spiral frx of proximal 1/3 of femur, w/ third part butterfly fragment;
- Type IV:
     - comminuted frxs w/ 4 or more fragments;
     - implant failures and non-unions are common;
     - consider use of AO 95 deg Condylar Screw / Blade Plate

- Type V:
     - subtrochanteric intertrochanteric fractures;
     - this group includes any subtroch frx w/ extension thru greater troch;
     - consider use of AO 95 deg Condylar Screw / Blade Plate