Radiographic features of Stage 4 MSP at the hip: MRI scan of a 14-year old boy, Type IV, left hemiplegia, chronic neglected hip displacement, GMFCS III. Note the full thickness loss of articular cartilage on the lateral aspect of the femoral head. The left hip was successfully reconstructed, but this is salvage surgery. The lost cartilage does not regenerate, and the hip is destined for premature arthrosis and arthroplasty.