Complete restoration of congenital conductive hearing loss by staged surgery: A case report

Table 1 Changes in hearing before and after surgery in stapedial tendon ossification patients

Ref.	Ears	Diagnosis	Treatment	Average of air-bone gaps
				[pre OP/post OP/△ (pre OP-post OP)]
Schuknecht et al[1], 1957	1	PE elongation	Division	NA	NA	NA
Patel[5], 1972	1	ST ossification	Division and stapedectomy	51.67 dB	15 dB	36.67 dB
Cremers et al[2], 1986	2	PE elongation	Division	22.5 dB	0 dB	22.5 dB
Grant et al[6], 1991	4	ST ossification	Division	31.67 dB	2.5 dB	29.17 dB
Jecker et al[8], 1992	2	ST ossification	Division	NA	NA	NA
Kinsella et al[3], 1993	3	Bony bar	Division	29.44 dB	0 dB	29.44 dB
Kurosaki et al[7], 1995	8	ST ossification	Division	NA	NA	NA
	1	ST ossification	Division and stapedectomy	NA	NA	NA
Thies et al[4], 1996	5	Bony bar	Division	25.83 dB	NA	NA
	3	ST ossification	Division	NA	NA	NA
Hara et al[9], 1997	8	ST ossification	Division	NA	NA	NA
Lee et al[11], 2009	1	ST ossification	Division	30 dB	13.33 dB	16.67 dB
Wetmore et al[12], 2011	6	Bony bar	Division	NA	NA	NA
Ulkü[13], 2011	2	ST ossification	Division	NA	NA	NA
Wasano et al[10], 2014	2	ST ossification	Division	25 dB	2.5 dB	22.5 dB
Chan[14], 2016	1	Bony bar	Division	NA	NA	NA

Air-bone gaps: Calculated using the American Academy of Otolaryngology recommendations. NA: Not available; PE: Pyramidal eminence; ST: Stapedial tendon.