Table 4.
C-arm Position and Leg Position During the Hip Arthroscopy and PAO Portion of the Case
| Leg Position | C-Arm Position | Portion of the Case |
|---|---|---|
| Hip arthroscopy | ||
| Straight, in traction | C-arm perpendicular to patient, straight AP | Central compartment work (labral repair, evaluation of articular cartilage) |
| Hip flexed 30-45o, traction removed | C-arm perpendicular to patient, rolled 15° under patient | Peripheral compartment work (cam decompression, elevation of iliocapsularis off capsule) |
| PAO | ||
| Straight | Not needed | Initial exposure |
| Flexed, knee over small radiolucent triangle∗ | Not needed | Medial exposure, to relax psoas tendon |
| Flexed, knee over small radiolucent triangle∗ | Not needed | Pubic osteotomy |
| Flexed, knee over small radiolucent triangle∗ | C-arm perpendicular to patient, straight AP and false profile | Ischial osteotomy, confirming location of osteotome and false profile confirming depth of osteotomy |
| Flexed, knee over small radiolucent triangle∗ | Not needed | Supracetabular osteotomy (performed after marking location of planned posterior column osteotomy) |
| Flexed, knee over small radiolucent triangle∗ | C-arm perpendicular to patient, false profile | Posterior column osteotomy |
| Flexed, knee over small radiolucent triangle,∗ leg abducted | C-arm perpendicular to patient, false profile | Lateral portion of posterior column osteotomy |
| Flexed, knee over small radiolucent triangle∗ | C-arm perpendicular to patient, straight AP (which matches preoperative standing AP pelvis) and false profile | Fragment fixation |
| Straight, with toes internally rotated 15° | Flat film | Confirming preliminary fixation |
AP, anteroposterior; PAO, periacetabular osteotomy.
∗
When using a radiolucent postless traction table, the operative leg can also be flexed and extended while positioned in the traction boot, with extra padding.