Transient osteoporosis of the hip (TOH) affects pregnant women in the third trimester of pregnancy. Magnetic resonance imaging plays an important role in the diagnosis and shows a pattern of bone marrow oedema. We report a case of TOH post-partum with involvement of both hips in a 34-year-old woman. She was known with undifferentiated spondyloartritis since 2004, which posed a diagnostic challenge. The reported patient was treated conservatively avoiding lactation, weight bearing activities, increased intake of calcium and vitamin D and recovered without further medical treatment.