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Table 5 Detailed list of focal vertebral lesions in five pigs

From: Osteochondrosis and other lesions in all intervertebral, articular process and rib joints from occiput to sacrum in pigs with poor back conformation, and relationship to juvenile kyphosis

Pig Vertebra Aspect/region Clockface locationa Growth cartilage Description (number indicates where lesion centred on clockface) Diagnosis
5 C6 Caudo-dorsal, but cranial to metaphyseal growth plate 11–12 o’clock Neuro-central synchondrosis Hypodense line outlining ovoid mineralised body towards floor of vertebral canal OCDb
C6 Caudal, entire metaphyseal growth plate Entire clockface Metaphyseal growth plate Thin and heterogeneous density “Physitis”
C6 Right transverse process Not applicable In bone between metaphyseal growth cartilage and synchondrosis Circular hypodense defect surrounded by bone Cyst
C6-C7 Caudo- and cranio-ventral 5–7 o’clock Epiphyseal growth cartilage Connected by small bony bridge Spondylosis
7* C7 Dorsal, entire cranio-caudal length 10–2 o’clock Neuro-central synchondrosis Gradual widening to 2–3 times as thick caudally Type I Salter-Harris fracture
8c C6 Left transverse process Not applicable Transverse process unknown growth cartilage Small and apparently fused with the transverse process of C7. The left transverse process of C5 matched the right transverse process of C6 in size. Transverse process de−/malformation/ “transposition”
T13 Left caudo-ventral 4–6 Block vertebra: growth cartilage absent 5–5.30: three mixed-density cones and one larger hemispherical defect
6–7: sclerosis
Osteochondrosis with repair (filling with bone, sclerosis)
T14 Left cranio-ventral 4–7 Block vertebra: growth cartilage absent 4–6: sclerosis
6–7: spherical defect
Cyst with repair (sclerosis)
T15 Left cranio-ventral 5.30–6.30 Epiphyseal and metaphyseal growth cartilage Three small mixed-density cones Osteochondrosis with repair (filling with bone)
T15 Left caudo-ventral 5–6.30 Epiphyseal bone Sclerosis opposite defect in L1 Old lesion scar or response to L1 lesion?
L1 Left cranio-ventral 4–6 Epiphyseal and metaphyseal growth cartilage Two conical defects Osteochondrosis
11 T16 Right caudo-ventral 5–8 Epiphyseal and metaphyseal growth cartilage 5: V-shaped defect
6: two small, hemispherical defects
6–8: two larger hemispherical defects
Left lateral abaxial margin: sclerotic margin
Further caudo-dorsally: two mixed-density conical defects
Osteochondrosis with secondary repair (filling with bone, sclerotic rim)
21 T13 Left cranio-ventral 4–6 Epiphyseal and metaphyseal growth cartilage Single-lobe defect with mineralised, OCD-like body, but represents reparative ossification centre from caudal and abaxial to defect OCD with secondary repair (mineralised body represents repair)
T14 Midline cranio-ventral 3–9.30 Epiphyseal and metaphyseal growth cartilage 4: stair-step defect
5: small cone with sclerotic rim
6: small cone
8: stair-step defect
Mineralised bodies: appear as three separate bodies in individual slices but are confluent in 3D rendering.
Osteochondrosis with repair (sclerotic rim, mineralised body represents repair)
T14 Left caudo-ventral 3.30–4.30 and 7 Epiphyseal and metaphyseal growth cartilage 4: two mixed-density lobes, sclerotic rim
7: small, square lobe; also smooth, linear mineralisation (in ligament?) extending in arc from cranio-ventral T14 towards caudo-ventral T13.
Osteochondrosis with repair (filling with bone), also spondylosis
T15 Mid-to-left caudo-ventral 4–8 Epiphyseal and metaphyseal growth cartilage 5.15–30: Two-step stair lesion, spherical with stalk to growth cartilage, with mineralised body advancing from cranio-ventral and around lesion laterally Cyst with repair (ossification advancing around lesion)
  1. *Pigs that received medical treatments are labelled with an asterisk
  2. aClockface location refers to location if superimposing a clockface on transverse plane vertebral body images viewed in the cranio-caudal direction
  3. bOCD Osteochondrosis dissecans
  4. cPig 8 five transverse (costal) process lesions: T11 left transverse process osteophytes; T12 right transverse process absent; T14 left transverse process thin, irregular shape, projects laterally; T14 right transverse process thick, irregular, projects laterally and returns to form complete, V-shaped arc; T15 small, smooth extra bony protrusion cranial to normal right transverse process. Pig 8 eight articular process joint lesions: T10–11 left side, both sides of articulation OCD; T11–12 left side, one side of articulation, caudal T11 OCD; T13–14 left and right sides, caudal T13 articular processes short and articulate with base of T14 spinous process as T14 cranial articular process absent; T14–15 left side, both sides of articulation OCD and right side, one side of articulation caudal T14 OCD