by Saam Morshed, Kevin Choo, Utku Kandemir, and Scott Patrick Kaiser

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Presentation transcript:

by Saam Morshed, Kevin Choo, Utku Kandemir, and Scott Patrick Kaiser Internal Fixation of Posterior Pelvic Ring Injuries Using Iliosacral Screws in the Dysmorphic Upper Sacrum by Saam Morshed, Kevin Choo, Utku Kandemir, and Scott Patrick Kaiser JBJS Essent Surg Tech Volume 5(1):e3 February 11, 2015 ©2015 by The Journal of Bone and Joint Surgery, Inc.

A three-dimensional reconstruction and holographic reconstruction of an outlet image that show all of the morphologic characteristics of sacral dysmorphism: (1) a first sacral segment not recessed in the pelvis, (2) an acute alar slope to the first sacral s... A three-dimensional reconstruction and holographic reconstruction of an outlet image that show all of the morphologic characteristics of sacral dysmorphism: (1) a first sacral segment not recessed in the pelvis, (2) an acute alar slope to the first sacral segment, (3) mamillary processes, (4) noncircular sacral foramina, and (5) a residual disc between the first and second sacral segments. There is a zone-222 sacral fracture. Saam Morshed et al. JBJS Essent Surg Tech 2015;5:e3 ©2015 by The Journal of Bone and Joint Surgery, Inc.

A mid-corridor coronal cut of the CT scan reformatted along the axis of the upper sacral segment, which demonstrates a zone-222 sacral fracture and the true coronal angulation of the first sacral segment. A mid-corridor coronal cut of the CT scan reformatted along the axis of the upper sacral segment, which demonstrates a zone-222 sacral fracture and the true coronal angulation of the first sacral segment. Saam Morshed et al. JBJS Essent Surg Tech 2015;5:e3 ©2015 by The Journal of Bone and Joint Surgery, Inc.

A mid-corridor coronal cut of the CT scan reformatted along the axis of the second sacral segment. Saam Morshed et al. JBJS Essent Surg Tech 2015;5:e3 ©2015 by The Journal of Bone and Joint Surgery, Inc.

A mid-corridor axial cut of the CT scan reformatted along the axis of the upper sacral segment, which demonstrates a zone-222 sacral fracture and the true axial angulation of the first sacral osseous corridor. A mid-corridor axial cut of the CT scan reformatted along the axis of the upper sacral segment, which demonstrates a zone-222 sacral fracture and the true axial angulation of the first sacral osseous corridor. Saam Morshed et al. JBJS Essent Surg Tech 2015;5:e3 ©2015 by The Journal of Bone and Joint Surgery, Inc.

A mid-corridor axial cut of the CT scan reformatted along the axis of the second sacral segment. Saam Morshed et al. JBJS Essent Surg Tech 2015;5:e3 ©2015 by The Journal of Bone and Joint Surgery, Inc.

The method for determining the coronal angulation of the upper sacral segment begins with a line drawn to connect the iliac crests. The method for determining the coronal angulation of the upper sacral segment begins with a line drawn to connect the iliac crests. A line is then drawn along the axis of the upper sacral segment. The coronal angulation is the angle subtended by these lines. Saam Morshed et al. JBJS Essent Surg Tech 2015;5:e3 ©2015 by The Journal of Bone and Joint Surgery, Inc.

The method for determining the axial angulation of the upper sacral segment begins with a line drawn to connect the posterior iliac spines. The method for determining the axial angulation of the upper sacral segment begins with a line drawn to connect the posterior iliac spines. A line is then drawn along the axis of the upper sacral segment. The axial angulation is the angle subtended by these lines. Saam Morshed et al. JBJS Essent Surg Tech 2015;5:e3 ©2015 by The Journal of Bone and Joint Surgery, Inc.

A central sacral support, fashioned from two or three folded sheets or blankets, allows access to unobstructed angled trajectories for placement of iliosacral screws along the true axis of the osseous corridor. A central sacral support, fashioned from two or three folded sheets or blankets, allows access to unobstructed angled trajectories for placement of iliosacral screws along the true axis of the osseous corridor. Saam Morshed et al. JBJS Essent Surg Tech 2015;5:e3 ©2015 by The Journal of Bone and Joint Surgery, Inc.

Adhesive drapes are placed along the inferior costal margin and along the posterior aspect of the buttock where it is in contact with the table to maximize the freedom and potential angles of approach to the sacral corridors. Adhesive drapes are placed along the inferior costal margin and along the posterior aspect of the buttock where it is in contact with the table to maximize the freedom and potential angles of approach to the sacral corridors. Saam Morshed et al. JBJS Essent Surg Tech 2015;5:e3 ©2015 by The Journal of Bone and Joint Surgery, Inc.

The prepared field can include the ipsilateral hindquarter to allow sterile traction and intraoperative manipulation. The prepared field can include the ipsilateral hindquarter to allow sterile traction and intraoperative manipulation. In this case, Schanz pins have been placed in both anterior inferior iliac spines to augment reduction maneuvers. Saam Morshed et al. JBJS Essent Surg Tech 2015;5:e3 ©2015 by The Journal of Bone and Joint Surgery, Inc.

The entry point is demonstrated on this inlet view. The entry point is demonstrated on this inlet view. It is positioned central along the osseous corridor of the first sacral segment and is targeted along the axis of the corridor in the anterior-to-posterior plane. Saam Morshed et al. JBJS Essent Surg Tech 2015;5:e3 ©2015 by The Journal of Bone and Joint Surgery, Inc.

The entry point is demonstrated on this outlet view. The entry point is demonstrated on this outlet view. It is positioned central along the osseous corridor of the first sacral segment and is targeted along the axis of the corridor in the superior-to-inferior plane. Saam Morshed et al. JBJS Essent Surg Tech 2015;5:e3 ©2015 by The Journal of Bone and Joint Surgery, Inc.

Drilling technique demonstrated on the inlet view. Drilling technique demonstrated on the inlet view. The cannulated drill is advanced along the desired trajectory, along the axis of the osseous corridor and along the trajectory of the guidewire, with a drill-forward technique. This enables subtle adjustments in the trajectory, which can be confirmed on alternating inlet and outlet views, before the drill traverses the sacroiliac joint. Saam Morshed et al. JBJS Essent Surg Tech 2015;5:e3 ©2015 by The Journal of Bone and Joint Surgery, Inc.

The outlet view confirms the trajectory of the drill in the superior-to-inferior plane. The outlet view confirms the trajectory of the drill in the superior-to-inferior plane. Advancing the drill in oscillation mode provides good tactile feedback and reduces etching to prevent perforation through the narrow anterior cortex of the sacral ala. Saam Morshed et al. JBJS Essent Surg Tech 2015;5:e3 ©2015 by The Journal of Bone and Joint Surgery, Inc.

The lateral sacral view is recommended to reduce the risk of perforation into the nerve root tunnel or sacral spinal canal. The lateral sacral view is recommended to reduce the risk of perforation into the nerve root tunnel or sacral spinal canal. This is most illustrative when, as seen in Fig. 7-B, the drill has reached a point superior to the neural foramen on the outlet view. At this point, the lateral projection should demonstrate the tip of the cannulated drill bit aimed through the iliac cortical density, for the upper sacral segment body. Saam Morshed et al. JBJS Essent Surg Tech 2015;5:e3 ©2015 by The Journal of Bone and Joint Surgery, Inc.

As visualized on the inlet view, the drill should be advanced until the surgeon encounters increased resistance or comes into close proximity to the anterior cortex of the contralateral sacral ala. As visualized on the inlet view, the drill should be advanced until the surgeon encounters increased resistance or comes into close proximity to the anterior cortex of the contralateral sacral ala. Saam Morshed et al. JBJS Essent Surg Tech 2015;5:e3 ©2015 by The Journal of Bone and Joint Surgery, Inc.

As visualized on the outlet view, the drill should be advanced until the surgeon encounters increased resistance or comes into close proximity to the superior end plate. As visualized on the outlet view, the drill should be advanced until the surgeon encounters increased resistance or comes into close proximity to the superior end plate. Saam Morshed et al. JBJS Essent Surg Tech 2015;5:e3 ©2015 by The Journal of Bone and Joint Surgery, Inc.

The drill has been removed, and the guidewire has been inserted with its blunt end leading. The drill has been removed, and the guidewire has been inserted with its blunt end leading. The drilled path can be sounded to check for perforation. The inlet view is shown here with the guidewire gently lodged at the end of the drilled path. Saam Morshed et al. JBJS Essent Surg Tech 2015;5:e3 ©2015 by The Journal of Bone and Joint Surgery, Inc.

This outlet view shows the guidewire gently lodged at the end of the drilled path. Saam Morshed et al. JBJS Essent Surg Tech 2015;5:e3 ©2015 by The Journal of Bone and Joint Surgery, Inc.

The screw is inserted along the guidewire after advancement of the cannulated tap. The screw is inserted along the guidewire after advancement of the cannulated tap. Note the axial orientation on the inlet view along the axis of the upper sacral segment osseous corridor. Shown here also is the entry point for a second screw placed through the safe transsacral corridor in the second sacral segment. Saam Morshed et al. JBJS Essent Surg Tech 2015;5:e3 ©2015 by The Journal of Bone and Joint Surgery, Inc.

The screw is inserted along the guidewire after advancement of the cannulated tap. The screw is inserted along the guidewire after advancement of the cannulated tap. Note the coronal orientation on the outlet view along the axis of the upper sacral segment osseous corridor. Shown here also is the entry point for a second screw placed through the safe transsacral corridor in the second sacral segment. Saam Morshed et al. JBJS Essent Surg Tech 2015;5:e3 ©2015 by The Journal of Bone and Joint Surgery, Inc.

A washer may be used to increase cortical contact. A washer may be used to increase cortical contact. The obturator inlet view provides verification of seating of the screw and washer against the iliac cortex. Saam Morshed et al. JBJS Essent Surg Tech 2015;5:e3 ©2015 by The Journal of Bone and Joint Surgery, Inc.

The final screw position should always be confirmed on the lateral sacral view. Saam Morshed et al. JBJS Essent Surg Tech 2015;5:e3 ©2015 by The Journal of Bone and Joint Surgery, Inc.

Final radiographs showing the upper sacral segment screw along the axis of the safe corridor and the transsacral second sacral segment screw. Final radiographs showing the upper sacral segment screw along the axis of the safe corridor and the transsacral second sacral segment screw. Saam Morshed et al. JBJS Essent Surg Tech 2015;5:e3 ©2015 by The Journal of Bone and Joint Surgery, Inc.