To determine the average acetabular antiversion angle in south Indian population, for ideal acetabular cup position in Total Hip Arthroplasty. Background: Abnormal acetabular anteversion of the hip, has been from many years the etiogenesis of early hip wear and tear leading to osteoarthritis [1] . In this era the demand for total hip replacements has increased worldwide and in India as well. The acetabular anteversion angle plays a very important role in terms of longevity of the implant and cup positioning. Since studies on acetabular anteversion are very few compared to western and Asian studies hence, the purpose of this study is to find out the acetabular anteversion angle for south Indian population. Materials and Methods: A retrospective study of 250 CT scans of hips where collected from 2017 to 2020 and the mean acetabular anteversion angle was measured which was compared with Asian and western population. Results: The average acetabular anteversion angle is 20.9±3.19 there was no statically significant difference between male and female population, as with the side, left and right side (p=0.02). There was a significant 2 to 3 degree increase in acetabular antiversion compared to US, European and Asian studies. Conclusion:The average acetabular anteversion angle 20.9 ±3.19 was significantly higher when compared to the western population due to the habitual cross legged sitting and squatting since childhood, hence this should be taken into consideration when designing and positioning acetabular cups during total hip arthroplasty.

<p class="abstract">Fractures of os trigonum is an extremely rare event. It is one of the accessory ossicles of the foot found in about 7 % of the population. Very few cases have been reported in the literature about a fracture of the ostrigonum. We present a case of fracture of ostrigonum with associated fracture of the fibula and a large lacerated wound in the leg, in a young man sustained due to road traffic accident. The initial radiological examination with Xray ankle showed a doubtful fracture of posterior process of talus but was not clear. The diagnosis was clinched by CT scan of the ankle with 2mm cuts, which showed clearly a fracture of the os trigonum. It was treated by flap cover for the wound and plaster immobilisation for the fracture. So, any doubtful fracture near the posterior process of talus should be fully assessed radiologically with a CT scan to guide in the treatment.</p>

<p>A combination of brachial artery injury and fracture shaft of humerus is a rare phenomenon. There is a general apprehension regarding survival of a limb after vascular injury. Only few studies exist in literature that discuss about the survival of such limbs. Our case is a 56 years old female patient who presented three hours after sustaining injury in the form of fracture shaft of humerus and complete transection of brachial artery distal to the origin of profunda brachii. Even though Doppler USG done initially revealed flow in the vessels distal to the injury, a CT Angiogram done later revealed cutting of the brachial artery. This prompted us to perform brachial artery exploration and repair. post operatively, digital subtraction angiography showed absence of flow in the brachial artery but limb survived due to extensive collateral circulation. Even after the golden period of vascular repair has lapsed, arterial repair is recommended if there is no evidence of gangrene. This should be supplemented with adequate systemic anticoagulants and/or fasciotomy.</p>