Partial articular fractures of the lateral condyle in the sagittal plane result from valgus stress, of medium to low energy, often combined with a rotational component.
These fractures are not common. They may be associated with ligamentous injuries to the knee. They are challenging to fix in osteoporotic bone.
X-ray taken from Orozco R et al, (1998) Atlas of Internal Fixation. Used with kind permission.