Distal clavicular osteolysis in adults: association with bench pressing intensity.

Abstract

To investigate the association between distal clavicular osteolysis (DCO) and bench pressing intensity. From a retrospective review of MRI shoulder reports of individuals between 20 and 40years of age, 262 male patients with DCO and 227 age-matched male patients without DCO were selected. All patients had completed a bench pressing questionnaire. The patients' bench pressing frequency (times per week), duration (years of bench pressing), bench pressing weight (maximum bench pressing weight with one repetition = 1RM) and the ratio of bench pressing weight to body weight were compared between both groups using Chi-square and Mann-Whitney tests. The results showed that 56% (146/262) of patients with DCO were high-intensity bench pressers (1RM more than 1.5 times the body weight) compared to 6% (14/227) in patients without DCO. High-intensity bench pressing was a risk factor for DCO (OR=19; 95%CI=11-35; p < 0.001). Low-intensity bench pressing (1RM less than 1.5 times the body weight) was not a risk factor for DCO (OR=0.6; 95%CI=0.4-0.8). High frequency (>1×/week) and duration (>5years) of bench pressing were risk factors. In bench pressers who suffered from DCO, the mean 1RM was 283lbs (±SD57) compared to 209lbs (±SD60) in bench pressers not affected by DCO (p < 0.001, Mann-Whitney). High-intensity, but not low-intensity bench pressing is a risk factor for DCO.