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Table 2 Contact pressure data from age-matched control and all DDH patients' hips*

From: Cartilage contact pressure elevations in dysplastic hips: a chronic overload model

  Control Patient 1 Patient 2 Patient 3 Patient 4 Patient 5 Patient 6
  Right Left Right Left Right Right Left Right Left Right Left Right
  Normal asym DDH DDH DDH asym DDH asym asym DDH DDH asym
Severin Classification I I I I I I II I I II III I
Acetabulum             
Increment 12 12 5 12 12 12 12 6 12 5 12 12
Max pressure (MPa) 1.754 4.945 6.984 3.563 8.298 4.922 5.25 4.526 7.05 6.87 8.587 4.83
Max cum press (MPa-sec/cycle) 1.145 3.192 4.686 2.447 4.699 3.108 3.835 3.463 5.48 5.44 6.553 3.107
Max chronic press (MPa-years) 0 1.926 3.399 0.566 3.416 1.403 2.323 1.852 4.41 4.36 5.764 1.402
Femoral Head             
Increment 12 12 4 12 12 9 12 3 12 5 12 12
Max pressure (MPa) 1.89 6.462 7.758 3.582 9.58 6.096 6.345 5.15 7.38 9.88 9.091 5.48
Max cum press (MPa-sec/cycle) 1.229 4.702 5.323 3.366 6.604 3.815 3.965 3.827 5.43 6.62 6.437 3.45
Max chronic press (MPa-years) 0 3.419 4.206 0.463 5.828 2.298 2.487 2.313 4.34 5.85 5.617 1.829
  1. *DDH in bold text cells, and asym is asymptomatic contralateral hip