Relationship of ABO Blood Type on Rotator Cuff Tears.
BACKGROUND
ABO blood groups are associated with various diseases. A relationship between Achilles tendon ruptures and blood type O has been reported, although its pathogenesis was not clear. To the best of our knowledge, there is no published study describing the relationship between blood type and rotator cuff tendon tears.


OBJECTIVE
To determine whether patients with rotator cuff tear had a greater prevalence of blood type O than those without rotator cuff tear.


METHODS
A cross-sectional study.


METHODS
Research hospital outpatient evaluation.


METHODS
A total of 316 subjects with shoulder pain were included and divided into "tear" and "no-tear" groups according to ultrasonographic examination.


METHODS
ABO blood group, gender, dominant arm, smoking history, trauma history, and age were compared between the 2 groups and the odds ratios of these factors were evaluated by logistic regression.


RESULTS
The tear group (38.6%) had more instances of blood type O than the healthy population (27.2%; P = .002). The adjusted odds ratio for rotator cuff tear for blood type O to non-O was 2.38 (95% confidence interval 1.28-4.42). The odds ratios for rotator cuff tears for smoking, major trauma history, minor trauma history, and age were 2.08, 3.11, 2.29, and 1.06, respectively.


CONCLUSIONS
Patients with rotator cuff tears were more likely to have blood type O. The odds ratios of factors for rotator cuff tears were high in the following order: major trauma history, blood type O, minor trauma history, and age.
Department of Orthopaedic Surgery, Ajou University, School of Medicine, Woncheon-dong, Yeongtong-gu, Suwon, South Korea.
Doo-Hyung
DH
Lee
Department of Orthopaedic Surgery, Ajou University, School of Medicine, Woncheon-dong, Yeongtong-gu, Suwon, South Korea.
Han-Dong
HD
Lee
Department of Physical Medicine and Rehabilitation, Ajou University, School of Medicine, san 5, Woncheon-dong, Yeongtong-gu, Suwon, 443-721, South Korea.
Seung-Hyun
SH
Yoon
D000017:ABO Blood-Group System; D000368:Aged; D000369:Aged, 80 and over; D016022:Case-Control Studies; D003430:Cross-Sectional Studies; D005260:Female; D006801:Humans; D016015:Logistic Models; D008297:Male; D008875:Middle Aged; D016017:Odds Ratio; D015995:Prevalence; D012307:Risk Factors; D000070636:Rotator Cuff Injuries; D013708:Tendon Injuries / Q000097:blood* / Q000175:diagnosis
D000017:ABO Blood-Group System