O arm

O arm

1. O- Arm

2. Introduction:- The O-arm Surgical Imaging System is a surgical imaging platform designed for use in orthopaedic surgeries. It provides real-time, intra-operative imaging of a patient’s anatomy with high quality images and a large field-of-view in both 2D and 3D. It has a breakable O shaped gantry ring. There is a segment that can fully or partially detach from the ring to provide an opening for the object to be imaged

3. 2D imaging systems uses Anteroposterior and lateral images incorporated with preop CT – Less Accurate 3D navigation – of cone beam CT enabled multiple fluoroscopic image acquisition by a device that rotated isocentrically around the patient – More Accurate

4. Reconstructed images from is transferred to an image – guided system for navigation. As the reference arc is tracked with patient imaging, the computer generated 3D image of the patients operative field is already registered and ready for use with navigation.

5. Advantages of 3D Navigation system O- arm:- Ability to image multi planar images, multiple levels in single sequence. Efficacy in imaging of cervico -dorsal junction and upper thoracic spine than conventional fluoroscopy. Decreased radiation exposure. Improved accuracy because the patients anatomy is registered in the surgical position Imaging accuracy in patients who had undergone prior spine surgeries at the same levels. Portability of the system.

6. Intraoperative 3D imaging helps in correction of malplacement of screws and avoidance of second surgery. Allow the application of minimally invasive approaches without elevating the risk of implant misplacements, and thus help to decrease skeletomuscular surgical trauma and ultimately the length of hospital stay of patients.

7. Multi planar imaging:- Axial, sagittal and oronal images Multiple level imaging without moving the machine in single sequence Imaging of cervicodorsal junction and upper thoracic spine.

8. Free hand technique will only be safe and accurate when it is in hand of an experienced surgeon. Accuracy of screw placement with O arm can reach 100%. The learning curve of O- arm is high when compared to the free hand technique which has a steep learning curve

9. Reduces Surgery time:- Placing and checking every screw with c-arm takes significant time Revising one misplaced screw can take as long as 20 minutes Misplacement rates have been reported to range from 5 to 41% in lumbar spine and from 3 to 55% in thoracic spine using conventional techniques. Complications associated with the technique of pedicle screw fixation. A selected survey of ABS members. 1993 Nov;18(15):2231-8; discussion 2238-9. doi : 10.1097/00007632-199311000-00015 .

10. Uses:- Spine surgery procedures Cervical fusion Lumbar fracture and fusion Deformity correction Assessment of pedicle screw position Pelvic trauma and ankle fractures Kyphoplasty Cranial neurosurgery