Table 2.

Terms used (since 1900) and first paper in which they appeared

Term used (in chronological order)	First paper
Relaxation of the pelvic joints in pregnancy	[1]
Pelvic osteo-arthropathy	[118]
Insufficientia pelvis gravidarum et puerperarum	[36]
Pelvic insufficiency	[6]
Backache during pregnancy	[114]
Pelvic girdle relaxation	[101]
Pelvic arthropathy	[90]
Pelvic instability	[49]
Postpartum pelvic arthropathy	[26]
Spinal and pelvic insufficiency	[7]
Symptom-giving pelvic girdle relaxation	[25]
Pelvic pain and pelvic joint instability	[98]
Posterior pelvic pain in pregnancy vs    back pain in pregnancy	[86]
Pelvic pain in pregnancy vs    low back pain in pregnancy	[28]
Peripartum pelvic pain	[63]
Pregnancy-related back and pelvic pain	[10]
Back pain postpartum	[74]
Pregnancy-related pelvic joint pain	[2]
Pregnancy-related low back pain	[68]
Pregnancy-related pelvic pain	[3]
Posterior pelvic pain since pregnancy	[67]
Posterior pelvic pain after pregnancy	[65]
Lumbar back and posterior pelvic pain during pregnancy	[75]
Pregnancy-related pain in the pelvis	[116]