Factors predicting hip joint aspiration yield or “dry taps” in patients with total hip arthroplasty

Table 2 Comparison of patient-specific factors between dry tap and non-dry tap cohorts

Factor	Dry tap		Non-dry tap		P values
Factor	N	Mean	N	Mean	MW	Logistic
Surgical factors
# Surgeries	120	1.57	216	1.63	0.743	0.655
Head size (mm)	51	35.4	99	34.5	0.125	0.236
Non-surgical factors
BMI	113	30.87	199	29.95	0.272	0.264
BMI of US-guided aspirations only	71	30.38	127	29.95	0.609	0.499
CRP (mg/L)	59	51.48	110	67.59	0.111	0.222
ESR (mm/h)	58	55.64	110	63.70	0.286	0.214

ISSN: 1749-799X