Surgical hardware
11 of the 802 records carry surgical instrumentation, in four kinds. Every implant is labelled as its own structure rather than left inside the bone that a segmenter had absorbed it into — each one below is rendered from the released segmentation.
Hip arthroplasty
8 cases
Stem, head and acetabular cup. Seven total hips and one hemiarthroplasty; on one the cup is anchored by screws passing through it into the ilium.
Interbody cage
1 case
Paired threaded cylinders, 27 × 14 mm each, screwed into the L5–L6 disc space. Hollow, so bone can grow through them.
Cannulated screws
1 case
Three parallel screws, 7 mm across and up to 93 mm long, in the inverted-triangle configuration used to fix a femoral neck fracture.
Sacroiliac screws
1 case
Iliosacral fixation crossing the joint from the ilium into the sacrum.
Every case was read by a radiologist before it was labelled. Filter on
hardware_labelled in the manifest before any measurement that depends on
a gap between bones: a cage-bridged interspace reads as “no gap” exactly as
a congenitally fused transitional vertebra does. In
9 cases the femoral head itself is an implant,
which is the landmark pelvic incidence and pelvic tilt are measured from.