Table 4.

Differences in control MRI findings (within 7 days prior to return to play) between professional athletes with and without reinjury

Variables	Non-reinjury (n = 50)	Reinjury (n = 9)	OR (95% CI)	p value
Transversal and/or mixed connective tissue gap
Absent	49 (9.8)	5 (55.6)	39.2 (3.64–422.14)	0.002
Present*	1 (2.0)	4 (44.4)
Loss of tendon tension
Absent	42 (84.0)	6 (66.8)	2.63 (0.54–12.7)	0.231
Present*	8 (16.0)	3 (33.3)
Longitudinal connective tissue gap
Absent	44 (88.0)	7 (77.8)	2.10 (0.35–12.52)	0.417
Present	6 (12.0)	2 (22.2)
Muscle fibres tear
Absent	43 (86.0)	7 (77.8)	1.76 (0.30–10.23)	0.532
Present	7 (14.0)	2 (22.2)
Loss of pennation angle
Absent	38 (76.0)	7 (77.8)	1
Present	12 (24.0)	2 (22.2)	0.90 (0.17–4.95)	0.908
Global improvement in oedema
Absent	21 (42.0)	4 (44.4)	0.91 (0.22–3.78)	0.891
Present	29 (58.0)	5 (55.6)
Adaptive oedema
Absent	5 (10.0)	2 (22.2)	0.39 (0.06–2.41)	0.310
Present	45 (90.0)	7 (77.8)
Feather oedema
Absent	30 (60.0)	4 (44.4)	1.87 (0.45–7.85)	0.389
Present*	20 (40.0)	5 (55.6)
Intermuscular oedema
Absent	35 (70.0)	2 (22.2)	8.17 (1.52–43.99)	0.015
Present*	15 (30.0)	7 (77.8)
Scar maturity
Immature	18 (36.0)	5 (55.6)	0.45 (1.11–1.89)	0.276
Mature	32 (64.0)	4 (44.4)
Hypertrophic scar
Absent	13 (26.0)	2 (22.2)	1.09 (0.23–5.10)	0.916
Present	36 (72.0)	7 (77.9)
Scar morphology
Absent	10 (20.0)	2 (22.2)	1.15 (0.39–3-35)	0.799
Elongated	34 (68.0)	6 (66.8)
Round	5 (10.0)	0
Fusiform	1 (2.0)	1 (11.1)
Callus gap
Absent	46 (92.0)	6 (66.7)	5.75 (1.03–32.17)	0.046
Present*	4 (8.0)	3 (33.3)
Risk of reinjury
Low: absence of any radiological sign	38 (76.0)	1 (11.11)
Medium: presence one radiological sign	12 (24.0)	2 (22.22)
High: presence of two radiological signs	0 (0.0)	6 (66.67)	29.58 (3.86–226.64)	0.001

*Radiological signs included in the model of the risk of reinjury