Term | Definition |
Dysplasia | Abnormality of the shape of the hip joint (usually shallowness of the acetabulum, involving the superior and anterior margins). |
Subluxatable/subluxable | The femoral head is reduced (ie, within the acetabulum) at rest but can be partially dislocated or subluxated with examination maneuvers. This is a hip with mild instability or laxity. |
Dislocatable | The femoral head is reduced at rest but can dislocate in other positions or with examination maneuvers. This is a hip with instability. |
Subluxation | The femoral head is partially outside of the acetabulum but remains in contact with it. |
Reducible | The hip is dislocated at rest, but the femoral head can be positioned into the acetabulum with manipulation (generally flexion and abduction). |
Dislocation | Complete loss of contact between the femoral head and the acetabulum. |
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