Table 3.

Control group features

Case	Sex	Age	Symptoms	Diagnosis	MRI features
1	Female	10 yrs 9 mths	Heel pain on excercise	Sever’s disease	No oedema, no pathological features
2	Female	10 yrs 11 mths	Hindfoot pain during sports	Simple bone cyst in the calcaneus	Calcaneal simple bone cyst, slight oedema localized in the cuboid
3	Female	12 yrs 2 mths	Sinus tarsi pain after walking	Sinus tarsi syndrome, cavovarus alignment	No oedema, no pathological features
4 (bilateral)	Female	6 yrs 4 mths	Posttraumatic medial ankle pain right, atraumatic chronic ankle pain left	Ankel instability right, left osteochondral lesion talat dome	Right: No oedema, no pathologic features; left: talar dome osteochondral lesion, no marrow oedema
5	Female	8 yrs 11 mths	Chronic sinus tarsi pain after sprain	Ankle instability	No oedema, no pathological features
6	Male	7 yrs 10 mths	Repeated ankle sprains	Ankle instability, lateral synchondrosis	Slight oedema surrounding synchondrosis, no other oedema or pathological features
7	Female	10 yrs 6 mths	Sinus tarsi pain during high level sports (dancing)	Planovalgus alignment, sinus tarsi syndrome with positive SPECT-CT talonavicular and subtalar	Slight oedema in the talar tail, no diffuse oedema or other pathological features
8 (bilateral)	Female	11 yrs 5 mths	Bilateral sinus tarsi pain during weight-bearing	Bilateral calcaneonavicular coalition	Right: calcaneonavicular coalition, no oedema; left: calcaneonavicular coalition, oedema at the distal fibular physis
9	Female	12 yrs 3 mths	Ongoing ankle pain after arthroscopic treatment of talar osteochondral lesion	Synovitis and stiffness of the ankle joint	Osteochondral lesion in the talus with surrounding oedema, slight oedema in the talar tail, no diffuse oedema
10	Male	8 yrs	Heel pain during athletics	Sever’s disease	No diffuse patchy oedema, punctiform red marrow islands in talus and calcaneus