Figure 1

The anteroposterior and lateral position of X-ray examination of the pelvic in SED patients showed that the vertebral body of the lower thoracic and lumbar vertebrae was widened and flattened (A);the typical step-like profile and mild kyphosis were formed, the intervertebral space was obviously narrowed, and the spinal physiological reflex disappeared (B); lumbar 5 sacrum 1 vertebral body had clear sign of spondylolisthesis (C);and imbalance in spine-pelvic sagittal position (D)"

Figure 2

Cross-section and three-dimensional reconstruction imaging of pelvic computed tomography (CT) in SED patients showed that the bilateral double hip joint degeneration was obvious, and a large number of osteophytes were formed, with subluxation (A), which was grade 3 in Tönnis score; the right hip joint was fully observed through the right side of pelvis, with serious degeneration and obvious osteophytes (B); the left hip joint was carefully recorded through the left side of pelvis, with serious degeneration and obvious osteophytes (C); focusing on the center of the left femoral head, a large number of osteophytes in the acetabulum and femoral head and neck, subluxation of the hip joint, and cystic deformation of the femoral head were seen in the coronal position (D); bilateral hip severe degeneration, anterior and posterior osteophytes, and even the formation of pseudo-articular capsule surrounding the femoral head by the osteophytes were observed in the axial position (E); similarly, focusing on the center of the right femoral head, a large number of osteophytes in the acetabulum and femoral head and neck, the formation of pseudo-articular capsule surrounding the femoral head by the osteophytes, and cystic deformation of the femoral head and acetabular weight-bearing areas were detected in the sagittal position (F)"

Figure 3

Successful concurrent bilateral THA were performed in a SED patient younger than 40 years with ceramic-on-ceramic artificial prostheses. Typical SED, hip osteoarthritis with grade 3 in Tönnis score, severe bilateral degeneration, osteophytes and cystic changes were confirmed in the preoperative hip (A-C); the artificial prostheses well fixed with normal position were observed in the anteroposterior and lateral position of X-ray radiograph at 12 months postoperative follow-up (D)"

Figure 4

Successful single THA was performed in a SED patient older than 50 years with ceramic-on-ceramic artificial prostheses. Typical SED,hip osteoarthritis with grade 3 in Tönnis score, severe hip degeneration, osteophytes and cystic changes were seen in the preoperative right hip (A, B), with the offset (32.34±0.88) mm; the artificial prostheses well fixed without any sign of early osteolysis prosthesis loosening or infection such as translucent line at 24 months postoperative follow-up (C), with the offset (36.15±0.54) mm"

Table 1

Analysis of SED patient characteristics undergoing THA with hip osteoarthritis"

Figure 5

Pre-operative and post-operative changes in SED patients with THA for pelvic-related parameters such as pelvic incidence, pelvic tilt, and sacral slope A, the pre-operative average pelvic incident, pelvic tilt, and sacral slope were 68.95°±4.60°, 52.75°±1.06°, and 17.45°±1.77°, respectively; B, the post-operative average pelvic incident, pelvic tilt, and sacral slope were 76.98°±5.12°, 60.51°±4.35°, and 18.10°±2.02°, respectively."

Table 2

Evaluation of short-term therapeutic effect of THA in SED with hip osteoarthritis (x-±s)"