The obturator externus bursa is a potential space located between the obturator externus tendon and the ischiofemoral
capsular ligaments at the posterior aspect of the hip joint capsule.
Koo et al., "Ultrasound-guided prolotherapy with polydeoxyribonucleotide sodium in ischiofemoral
impingement syndrome," Pain Practice, vol.
The right femur displayed a transverse cut mark running across the anteromedial surface of the neck, which is likely to have been undertaken for the purpose of disconnecting the ischiofemoral
ligament to enable the head of the femur to be pulled out of the acetabulum.
(4,5) The causes of EHI have been further classified into specific conditions: central iliopsoas impingement, subspine impingement, ischiofemoral
impingement, and greater trochanteric-pelvic impinge ment.
Moreover, recent reports have shown atypical forms of hip impingement such as subspine impingement, ischiofemoral
impingement, iliopsoas impingement, abnormal femoral antetorsion, and abnormal pelvic tilt [12, 13].
Currently of interest are extra-articular sources of FAI, which may cause a small proportion of FAI cases and are exemplified by trochanteric-pelvic, ischiofemoral
and subspine impingement (Pan et al., 2011; Hapa et al., 2013; de Sa et al., 2014).
(10,13) Recent studies have identified a type of ischiofemoral
impingement where QF is reportedly compressed between the ischium-hamstring tendon origin and the lesser trochanter.
ligament, which attaches to the ischium (the lowest part of the pelvis) and between the two trochanters.
TABLE 1 Types of resection with methods of reconstruction (3) Resection Limb sparing type surgery (41) Amputation (8) Reconstruction (19) T1 7 1 free vascularised fibular graft 1 pelvic reconstruction with bone cement T1/2 4 3 ischiofemoral
pseudarthrodesis T2 0 2 pelvic allograft with hip arthroplasty T2/H1 3 1 saddle prosthesis 8 saddle prosthesis T2/3 9 8 1 pelvic allograft with hip arthroplasty T3 3 T4 9 T1/4 6 1 free vascularised femoral graft 1 ischiofemoral
pseudarthrosis Pelvic resections are classified by Enneking and Dunham (2) into four types: iliac (T1), acetabular (T2), pubis or ischium (T3) and sacral (T4).
The position of the cut marks on the femoral necks is classic for release of the iliofemoral (anterior) and the ischiofemoral
Another limb-sparing procedure is iliofemoral or ischiofemoral
Various reconstructive techniques have been proposed, such as iliofemoral coaptation and ischiofemoral
arthrodesis, with poor functional results.