Arthroscopic ankle fusion only has a limited advantage over the open operation if osseous operation type is the same: a retrospective comparative study

Table 2 Patients etiology conditions

	Between-group difference (all patients)			Difference detailed into subgroup (osseous operation type: not same)			Difference detailed into subgroup (osseous operation type: same)			Internal difference of OAF group (osseous operation type: not same)
	AAF (n = 17)	OAF (n = 26)	P	AAF (n = 17)	COO (n = 15)	P	AAF (n = 17)	SOO (n = 11)		COO (n = 15)	SOO (n = 11)	P
Etiology (No. and %)
Osteoarthritis	7 (41.2%)	2 (7.7%)	0.008	7 (41.2%)	0	0.005	7 (41.2%)	2 (18.2%)	0.203	0	2 (18.2%)	0.086
Post-trauma arthritis (fracture)	3 (17.6%)	11 (42.3%)	0.092	3 (17.6%)	7 (46.7%)	0.077	3 (17.6%)	4 (36.4%)	0.264	7 (46.7%)	4 (36.4%)	0.599
Posttrauma arthritis (ligament lesions)	5 (29.4%)	1 (3.8%)	0.018	5 (29.4%)	0	0.022	5 (29.4%)	1 (9.1%)	0.201	0	1 (9.1%)	0.234
Infectious arthritis	2 (11.8%)	2 (7.7%)	0.653	2 (11.8%)	1 (6.7%)	0.621	2 (11.8%)	1 (9.1%)	0.823	1 (6.7%)	1 (9.1%)	0.819
Rheumatoid arthritis	0	2 (7.7%)	0.242	0	0	NS	0	2 (18.2%)	0.068	0	2 (18.2%)	0.086
Urarthritis	0	1 (3.8%)	0.413	0	0	NS	0	1 (9.1%)	0.206	0	1 (9.1%)	0.234
Talus necrosis	0	4 (15.4%)	0.038	0	4 (26.7%)	0.023	0	0	NS	4 (26.7%)	0	0.026
Clubfoot	0	2 (7.7%)	0.242	0	2 (13.3%)	0.120	0	0	NS	2 (13.3%)	0	0.128
Charcot arthritis	0	1 (3.8%)	0.413	0	1 (6.7%)	0.279	0	0	NS	1 (6.7%)	0	0.288

AAF arthroscopic ankle fusion group, OAF open ankle fusion group (demographic composition: OAF = COO + SOO), COO complex osseous operation, SOO simple osseous operation. P P values: α = 0.05 (Chi-squared test)

ISSN: 1749-799X