I'm saying I think your understanding of central compartment is incorrect. Josephine might be able to straighten out medical side but I don't believe they invaded the capsule. They stretched (distracted) the hip to put things in better alignment but the psoas is located outside the capsule. I asked my surgeon whether NSAIDs were necessary to prevent HO and he said they weren't because they wouldn't actually be working that close to the bones/joint. The amount of stretching of hip wasn't that great so I didn't have any time on crutches or brace - just a cane for first couple days as stiffness leads to instability. I did read about 6 weeks on crutches but my surgeon said that was for other arthroscopies where they were needing to get into the joint.