Subsidence of callotasis zone in distraction osteogenesis after external fixator removal, measured by RSA

Figures & data

Subsidence values with time intervals between removal of the external fixator and first RSA examination, and between the two post-removal examinations

Patient	Lengthening (mm)	Obs. time 1 (weeks)	Subsidence 1 (mm) ^a	Obs. time 2 (weeks)	Subsidence 2 (mm) ^a
T1	25	24	0.05	31	–0.03
T2	31	7	–0.04
T3	25	4	–0.05	15	–0.13
T4	55	11	–0.03
T5	6	22	0.01
T6	32	16	0.54	24	0.25
T7	38	10	–0.28
T8	15	4	0.03	17	–0.06
T9	25	32 ^b	–0.11
F1	34	12	0.59
F2	80	8	0.03	70	0.27
F3	32	23	0.09
F4	25	6	–0.13	28	0.00
F5	40	32 ^b	0.12
F6	47	20	0.08
F7	30	7	–0.12	16	–0.37
F8	60	8	–0.06	23	–0.15
Median	32	11	0.01	24	–0.05
Min	6	4	–0.28	15	–0.37
Max	80	32	0.59	70	0.27

^a Negative value = shortening; positive value = lengthening.

^b same patient.

T: tibia; F: femur.

The standard examination setup with the patient in standing position and weight bearing recorded on a scale for RSA measurement of callotasis subsidence.