Traumatic atlanto-axial subluxation is a rare injury which may not be revealed on routine radiographs, especially when there is muscle spasm.

In 17 adult and 3 full term fetuses the hip joints were dissected to expose the insertion of gluteus minimus. An attachment of the deep surface of the tendon as it passes over the hip joint capsule was found in every case. Histological examination of this insertion confirmed the presence of short intramuscular tendons firmly anchoring the tendon to the capsule. It is suggested that this attachment retracts the capsule during hip joint motion, thereby preventing capsular entrapment.

No abstract

Beaulieu JG, Razzano CD, Levine RB. Transient osteoporosis of the hip in pregnancy : review of literature and a case report.