Summary Acetabulum fractures are pelvis fractures that involve the articular surface of the hip joint and may involve one or two columns, one or two walls, or the roof within the pelvis. Diagnosis can be made radiographically with dedicated pelvis radiographs (including Judet views) but frequently require CT pelvis for surgical planning. Treatment can be nonoperative for non-displaced fractures but displaced injuries require anatomic open reduction and internal fixation to minimize development of post-traumatic osteoarthritis. Epidemiology Incidence ~ 4 per 100,000 per year Demographics fractures occur in a bimodal distribution high energy trauma in younger patients (e.g., motor vehicle accidents) low energy trauma in elderly patients (e.g., fall from standing height) Etiology Pathoanatomy fracture pattern predominately determined by force vector position of femoral head at time of injury bone quality (e.g., age) Associated conditions orthopaedic manifestations lower extremity injury (36%) nerve palsy (13%) most commonly seen in transverse + posterior wall fracture patterns most commonly affects the peroneal division of the sciatic nerve spine injury (4%) systemic injuries head injury (19%) chest injury (18%) abdominal injury (8%) genitourinary injury (6%) Anatomy Osteology acetabular inclination & anteversion mean lateral inclination of 40 to 48 degrees anteversion of 18 to 21 degrees column theory acetabulum is supported by two columns of bone form an "inverted Y" connected to sacrum through sciatic buttress posterior column comprised of quadrilateral surface posterior wall and dome ischial tuberosity greater/lesser sciatic notches anterior column comprised of anterior ilium (gluteus medius tubercle) anterior wall and dome iliopectineal eminence lateral superior pubic ramus Vascular corona mortis anastomosis of external iliac (epigastric) and internal iliac (obturator) vessels at risk with lateral dissection over superior pubic ramus Letournel Classification Judet and Letournel most common referenced classification system classifed as 5 elementary and 5 associated fracture patterns most common fracture patterns younger posterior wall transverse fracture "family" transverse T-type transverse + posterior wall elderly anterior column (e.g., quadrilateral plate fractures) anterior column, posterior hemitransverse assoicated both column fractures Elementary patterns Illustration AP Obturator ob. Iliac ob. CT Comments Posterior wall Most common "gull sign" on obturator oblique view Check for injury to superior gluteal NV bundle Posterior column Check for injury to superior gluteal NV bundle Anterior wall Very rare Anterior column More common in elderly patient with fall from standing Transverse Axial CT shows anterior to posterior fx line Only elementary fx to involve both columns Associated patterns Illustration AP Obturator ob. Iliac ob. CT Comments Associated Both Column Characterized by dissociation of the articular surface from the innominate bone "spur sign" on obturator oblique Transverse + Post. Wall Most common associated fx Associated with the highest incidence of nerve injury T-type May need combined approach Anterior column or wall + Post. hemitransverse Most common in elderly patients Post. column + Post. wall Only associated fracture that does not involve both columns Imaging Radiographs Recommended views AP judet obturator oblique shows profile of obturator foramen shows anterior column and posterior wall iliac oblique shows profile of involved iliac wing shows posterior column and anterior wall Optional views inlet/outlet if concerned for pelvic ring involvement examination under anesthesia (EUA) used to assess posterior wall stability hip positioned in flexion, adduction and axial load obtain obturator oblique view opening of the medial clear space suggests instability of the posterior wall fracture Findings radiographic landmarks of the acetabulum iliopectineal line (anterior column) ilioischial line (posterior column) anterior wall posterior wall teardrop weight bearing roof superior acetabular rim may show os acetabuli marginalis superior which can be confused for fracture in adolescents Shenton's line roof arc angle angle between vertical line through femoral head and line through fracture helps to define fracture pattern stability considered stable if the fracture line exits outside the weight bearing dome of the acetabulum defined as > 45° on AP, obturator and iliac oblique views not applicable for associated both column or posterior wall pattern because no intact portion of the acetabulum to measure gull sign represents impaction of superomedial roof seen on iliac oblique view pathognomic for posterior wall fractures spur sign represents most caudal part of intact ilium due to medialization of articular components seen on obturator oblique view pathognomic for ABC fractures CT scan indications now considered a gold standard in management findings fracture pattern orientation define fragment size and orientation identify marginal impaction identify loose bodies (e.g., post-reduction) look for articular gap or step-off roof-arc measurements view 2 mm fine cuts on axial view findings assess stability of the weight bearing dome based on the exiting fracture line defined as an intact subchonral ring in the superior 10 mm of the acetabulum > 2 mm incongruity in the articular segment is considered unstable Duplex doppler ultrasound indications delayed presentation to treating hospital rule out DVT Treatment Nonoperative protected weight bearing for 6-8 weeks indications patient factors high operative risk (e.g., elderly patients, presence of DVT) morbid obesity open contaminated wound late presenting > 3 weeks fracture characteristics minimally displaced fracture (< 2 mm) < 20% posterior wall fractures treatment based on size of posterior wall is controversial recommend an exam under anesthesia (EUA) using fluoroscopy best method to test stability femoral head congruency with weight bearing roof (out of traction) both column fracture pattern with secondary congruence (out of traction) displaced fracture with roof arcs > 45° in AP and Judet views or >10 mm on axial CT cuts technique skeletal traction NOT required if stable fracture pattern, outside the weight-bearing dome activity as tolerated with crutches/walker weight-bearing lowest joint reactive forces seen with toe-touch weight bearing and passive hip abduction greatest joint contact force seen when rising from a chair on the affected extremity DVT prophylaxis close radiographic follow-up Operative treatment open reduction and internal fixation indications patient factors < 3 weeks from date of injury physiologically stable adequate soft-tissue envelope no local infection pregnancy is not contraindication to surgical fixation fracture factors displacement of roof (> 2 mm) unstable fracture pattern (e.g. posterior wall fracture involving > 40-50%) marginal impaction intra-articular loose bodies irreducible fracture-dislocation approaches anterior ilioinguinal iliofemoral modified stoppa posterior Kocher-Langenbach combined extended iliofemoral techniques factors considered for fiaxtion methodology location (column and/or wall) and level (high or low) of the fracture pattern amount of displacement marginal impaction associated injury fixation modalities column fixation strategies reconstruction bridging plate and screws percutaneous column screws cable fixation wall fixation strategies bridge plate and screws lag screw and neutralization plate spring (butress) plate outcomes timing associated hip dislocations should be reduced within 12 hours for improved outcomes incarcerated fragments upon reduction can be treated with urgent ORIF or placement of skeletal traction and delayed ORIF worse outcomes with fixation of fracture > 3 weeks from time of injury earlier operative treatment associated with increased chance of anatomic reduction peri-operative clinical outcome correlates with quality of articular reduction postoperative CT scan is most accurate way to determine posterior wall accuracy of reduction which has greatest correlation with clinical outcome ideally articular reduction <2mm post-operative greatest stress on acetabular repair occurs when rising from a seated position using the affected leg, and occurs in the posterior superior portion of the acetabulum functional outcomes most strongly correlate with hip muscle strength and restoration of gait postoperatively total hip arthroplasty indications usually elderly patients with significant osteopenia and/or significant comminution pre-existing arthritis post-traumatic arthritis in all ages techniques timing immediate vs. delayed THA immediate THA (with, or without, fracture fixation) wall fractures butress plate with multi-hole cup column fracture cage and cup constructs delayed THA outcomes patients older than 60 years have approx. a 30% late conversion rate to THA after acetabular fractures 10-year implant survival noted to be around 75-80% Techniques Percutaneous fixation with column screws approach anterograde (from iliac wing to ramus) retrograde (from ramus to iliac wing) posterior column screws imaging obturator outlet best view to rule out joint penetration iliac inlet view best to determine anteroposterior position of screw within the pubic ramus obturator inlet view best to determine position of a supraacetabular screw within tables of the ilium ORIF approaches approach depends on fracture pattern two approaches can be combined Approaches Indications Risks Anterior Approach (Ilioinguinal) Anterior wall and anterior column Both column fracture Posterior hemitransverse Femoral nerve injury LFCN injury Thrombosis of femoral vessels Laceration of corona mortis in 10-15%. Posterior Approach (Kocher-Langenbach) Posterior wall and posterior column fx Most transverse and T-shaped Combination of above Increased HO risk compared with anterior approach Sciatic nerve injury (2-10%) Damage to blood supply of femoral head (medial femoral circumflex) Extensile Approach (extended iliofemoral) Only single approach that allows direct visualization of both columns Associated fracture pattern 21 days after injury Some transverse fxs and T types Some both column fxs (if posterior comminution is present) Massive heterotopic ossification posterior gluteal muscle necrosis Modified Stoppa Approach Access to quadrilateral plate to buttress comminuted medial wall fractures Corona mortis must be exposed and ligated in this approach Complications Post-traumatic DJD most common complication 80% survival noted at 20 years for patients s/p ORIF risk factors for DJD include age >40 associated fracture patterns concomitant femoral head injury treat with hip fusion or THA Heterotopic ossification highest incidence with extensile approach treat with indomethacin x 5 weeks post-op low dose external radiation (no difference shown in direct comparison) lowest incidence with anterior ilioinguinal approach Osteonecrosis 6-7% of all acetabular fractures 18% of posterior fracture patterns DVT and PE Infection Bleeding Neurovascular injury risk factor highest incidence with transverse + posterior wall fractures Intraarticular hardware placement Abductor muscle weakness Prognosis Poor outcomes are associated with: multi-system trauma increasing age poor articular congruency associated femoral head articular injury post-traumatic arthritis
Technique Guide Technique guides are not considered high yield topics for orthopaedic standardized exams including ABOS, EBOT and RC. Acetabulum Posterior Wall Fracture ORIF Richard Yoon Jan Szatkowski Trauma - Acetabular Fractures
QUESTIONS 1 of 71 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 Previous Next Sorry, this question is for PEAK Premium Subscribers only Upgrade to PEAK Sorry, this question is for PEAK Premium Subscribers only Upgrade to PEAK Sorry, this question is for PEAK Premium Subscribers only Upgrade to PEAK Sorry, this question is for PEAK Premium Subscribers only Upgrade to PEAK Sorry, this question is for PEAK Premium Subscribers only Upgrade to PEAK (OBQ19.98) A 38-year old unrestrained man is involved in a motor vehicle collision and presents with the injury depicted in Figures A and B. The patient undergoes the operative intervention depicted in Figure C through the extended iliofemoral approach. Which of the following variables below is a protective factor against early conversion of the fixation to total hip arthroplasty for this patient? QID: 214000 FIGURES: A B C Type & Select Correct Answer 1 Femoral head cartilage defect 7% (93/1320) 2 Age 68% (892/1320) 3 Gender 11% (146/1320) 4 Initial fracture displacement > 20mm 4% (54/1320) 5 Surgical approach 10% (130/1320) L 1 Question Complexity A Question Importance Select Answer to see Preferred Response SUBMIT RESPONSE 2 Review Tested Concept Review Full Topic (OBQ19.9) A 33-year-old male presents to the ER after a head-on motor vehicle collision complaining of severe left hip pain. Initial AP pelvis x-rays are shown in Figure A. You wish to further asses his injury pattern by ordering additional radiographs. Which of the following images will be the MOST helpful in visualizing the left posterior column? QID: 213911 FIGURES: A Type & Select Correct Answer 1 Left obturator oblique inlet 3% (38/1373) 2 Right iliac oblique 2% (33/1373) 3 Left obturator oblique 12% (158/1373) 4 Left iliac oblique 81% (1118/1373) 5 Right iliac oblique outlet 1% (16/1373) L 2 Question Complexity A Question Importance Select Answer to see Preferred Response SUBMIT RESPONSE 4 Review Tested Concept Review Full Topic Sorry, this question is for PEAK Premium Subscribers only Upgrade to PEAK Sorry, this question is for PEAK Premium Subscribers only Upgrade to PEAK Sorry, this question is for PEAK Premium Subscribers only Upgrade to PEAK Sorry, this question is for PEAK Premium Subscribers only Upgrade to PEAK Sorry, this question is for PEAK Premium Subscribers only Upgrade to PEAK (OBQ18.202) A 35-year-old male sustains the injury shown in Figure A. He is currently not cleared for surgery due to a severe head injury. At what time point after the injury is there an increased risk of a poor outcome? QID: 213098 FIGURES: A Type & Select Correct Answer 1 48 hours 26% (571/2213) 2 5 days 13% (277/2213) 3 1 week 12% (259/2213) 4 2 weeks 20% (451/2213) 5 3 weeks 29% (643/2213) L 5 Question Complexity A Question Importance Select Answer to see Preferred Response SUBMIT RESPONSE 5 Review Tested Concept Review Full Topic (OBQ18.196) What is the spur sign and on which view is it best seen? QID: 213092 Type & Select Correct Answer 1 Intact ilium; obturator oblique 43% (944/2175) 2 Intact ilium; iliac oblique 10% (214/2175) 3 Posterior wall fragment; iliac oblique 10% (226/2175) 4 Posterior wall fragment; obturator oblique 34% (738/2175) 5 Posterior wall fragment; oburator inlet 1% (32/2175) L 5 Question Complexity A Question Importance Select Answer to see Preferred Response SUBMIT RESPONSE 1 Review Tested Concept Review Full Topic (OBQ18.194) Which of the following acetabular fractures is classified as an elementary fracture pattern that involves two columns? QID: 213090 FIGURES: A B C D E Type & Select Correct Answer 1 Figure A 17% (322/1878) 2 Figure B 71% (1334/1878) 3 Figure C 3% (65/1878) 4 Figure D 6% (118/1878) 5 Figure E 1% (24/1878) L 2 Question Complexity A Question Importance Select Answer to see Preferred Response SUBMIT RESPONSE 2 Review Tested Concept Review Full Topic (OBQ18.199) During which surgical approach to the acetabulum is the sciatic nerve placed at risk, and how should the patient be positioned to minimize the risk of injury? QID: 213095 Type & Select Correct Answer 1 Kocher-Langenbeck; hip extended and knee extended 2% (43/1812) 2 Kocher-Langenbeck; hip extended and knee flexed 92% (1671/1812) 3 Kocher-Langenbeck; hip flexed and knee extended 3% (62/1812) 4 Ilioinguinal; hip extended and knee extended 0% (5/1812) 5 Ilioinguinal; hip extended and knee flexed 1% (13/1812) N/A Question Complexity A Question Importance Select Answer to see Preferred Response SUBMIT RESPONSE 2 Review Tested Concept Review Full Topic Sorry, this question is for PEAK Premium Subscribers only Upgrade to PEAK Sorry, this question is for PEAK Premium Subscribers only Upgrade to PEAK Sorry, this question is for PEAK Premium Subscribers only Upgrade to PEAK Sorry, this question is for PEAK Premium Subscribers only Upgrade to PEAK Sorry, this question is for PEAK Premium Subscribers only Upgrade to PEAK Sorry, this question is for PEAK Premium Subscribers only Upgrade to PEAK Sorry, this question is for PEAK Premium Subscribers only Upgrade to PEAK Sorry, this question is for PEAK Premium Subscribers only Upgrade to PEAK Sorry, this question is for PEAK Premium Subscribers only Upgrade to PEAK (OBQ12.97) An 18-year-old male sustains a right hip injury after being tackled on the football field. Figure A shows his radiograph upon presentation to the emergency room three hours later. On physical exam, he is noted to have a foot drop and decreased sensation globally throughout his entire lower leg. Closed reduction under conscious sedation is immediately performed, and the hip is able to be ranged through a stable arc of motion following reduction. A post-reduction radiograph is shown in Figure B. Shortly after the reduction, the patient continues to have a foot drop, but his sensation is slightly improved. Which of the following is the most appropriate next step in management? QID: 4457 FIGURES: A B Type & Select Correct Answer 1 Exploration of his sciatic nerve 1% (49/4376) 2 EMG 2% (69/4376) 3 CT scan of his right hip 59% (2575/4376) 4 Touch-down weight bearing of his right leg and observation of his sciatic nerve palsy 37% (1607/4376) 5 Skeletal traction on the distal femur to relax tension on the sciatic nerve 1% (44/4376) L 3 Question Complexity B Question Importance Select Answer to see Preferred Response SUBMIT RESPONSE 3 Review Tested Concept Review Full Topic Sorry, this question is for PEAK Premium Subscribers only Upgrade to PEAK (OBQ12.212) The posterior wall of the acetabulum is best visualized on which of the following radiographic views? QID: 4572 Type & Select Correct Answer 1 Inlet pelvis 1% (75/6395) 2 Outlet pelvis 1% (86/6395) 3 Anteroposterior pelvis 1% (43/6395) 4 Obturator oblique pelvis 85% (5432/6395) 5 Iliac oblique pelvis 11% (732/6395) L 2 Question Complexity A Question Importance Select Answer to see Preferred Response SUBMIT RESPONSE 4 Review Tested Concept Review Full Topic Sorry, this question is for PEAK Premium Subscribers only Upgrade to PEAK Sorry, this question is for PEAK Premium Subscribers only Upgrade to PEAK (OBQ11.22) A 34-year-old male presents with the right posterior wall acetabular fracture shown in Figure A. What is the most accurate method to test for hip stability in this patient? QID: 3445 FIGURES: A Type & Select Correct Answer 1 The Keith method 1% (49/4021) 2 The Moed method 1% (42/4021) 3 The Calkins method 1% (34/4021) 4 Dynamic fluoroscopic examination of the hip under anesthesia 96% (3847/4021) 5 A history of associated hip dislocation 1% (39/4021) L 1 Question Complexity B Question Importance Select Answer to see Preferred Response SUBMIT RESPONSE 4 Review Tested Concept Review Full Topic Sorry, this question is for PEAK Premium Subscribers only Upgrade to PEAK Sorry, this question is for PEAK Premium Subscribers only Upgrade to PEAK (OBQ11.148) A 35-year-old male suffers an anterior column acetabular fracture during a motor vehicle collision, and subsequently undergoes percutaneous acetabular fixation. Intraoperatively, fluoroscopy is positioned to obtain an obturator oblique-inlet view while placing a supraacetabular screw. Which of the following screw relationships is best evaluated with this view? QID: 3571 Type & Select Correct Answer 1 Intraarticular penetration of the screw 15% (436/2920) 2 Position of the screw cephalad to the sciatic notch 8% (236/2920) 3 Screw starting point at the anterior inferior iliac spine 15% (452/2920) 4 Screw starting point at the gluteal pillar 3% (82/2920) 5 Screw position between the inner and outer tables of the ilium 58% (1700/2920) L 3 Question Complexity B Question Importance Select Answer to see Preferred Response SUBMIT RESPONSE 5 Review Tested Concept Review Full Topic (OBQ11.205) A 14-year-old presents on the request of her pediatrician for evaluation of her left hip. The patient reports having a recent history of lower abdominal pain, and as part of the work-up a KUB radiograph was obtained. The abdominal work-up was negative, and her pain has since resolved, however, the pediatrician noted an abnormal radiographic finding in the left hip and requested a formal orthopedic evaluation. The patient denies any history of hip trauma or pain. A left hip radiograph is shown in Figure A, and the the abnormality in question is indicated by the white arrow. The radiographic finding is most consistent with which of the following? QID: 3628 FIGURES: A Type & Select Correct Answer 1 Os acetabuli marginalis superior 97% (3241/3356) 2 Fovea capitis 1% (24/3356) 3 Myositis ossficans 1% (35/3356) 4 Avascular necrosis. 1% (19/3356) 5 Acetabular fracture 1% (26/3356) L 1 Question Complexity B Question Importance Select Answer to see Preferred Response SUBMIT RESPONSE 1 Review Tested Concept Review Full Topic (OBQ11.241) A 32-year-old male sustains a posterior wall acetabulum fracture as the result of a high-speed motor vehicle collision. Improved patient-reported outcomes after surgical treatment are associated with which of the following variables? QID: 3664 Type & Select Correct Answer 1 Increased age 3% (100/2873) 2 Increased hip flexion-extension arc 27% (789/2873) 3 Immediate weight-bearing 11% (305/2873) 4 Increased hip muscle strength 56% (1617/2873) 5 Decreased stride length 2% (45/2873) L 3 Question Complexity C Question Importance Select Answer to see Preferred Response SUBMIT RESPONSE 4 Review Tested Concept Review Full Topic (OBQ11.155) A 74-year-old man falls, sustaining the injury shown in Figures A through C. In surgical planning, what is the best surgical approach to treat this injury? QID: 3578 FIGURES: A B C Type & Select Correct Answer 1 Kocher-Langenbeck 14% (428/3124) 2 Watson-Jones 3% (92/3124) 3 Extended iliofemoral 9% (279/3124) 4 Ilioinguinal 74% (2297/3124) 5 Hardinge 0% (14/3124) L 2 Question Complexity A Question Importance Select Answer to see Preferred Response SUBMIT RESPONSE 4 Review Tested Concept Review Full Topic (OBQ11.80) A 35-year-old male undergoes closed reduction under sedation in the emergency department for a posterior hip dislocation with an associated posterior wall fracture. The post-reduction CT is seen in Figure A. What is the appropriate next step in management of this injury? QID: 3503 FIGURES: A Type & Select Correct Answer 1 Nonoperative management based on the size of the posterior wall fragment 9% (265/3089) 2 Operative management based on the size of the posterior wall fragment 3% (88/3089) 3 Operative management based on the history of hip dislocation 3% (92/3089) 4 Dynamic fluoroscopic stress exam under anesthesia in the obturator oblique view 77% (2375/3089) 5 Dynamic fluoroscopic stress exam under anesthesia in the iliac oblique view 8% (254/3089) L 2 Question Complexity B Question Importance Select Answer to see Preferred Response SUBMIT RESPONSE 4 Review Tested Concept Review Full Topic (OBQ10.203) When placing a percutaneous retrograde pubic ramus screw for fixation of an acetabular fracture, which of the following radiographic views can best ensure that the screw does not exit the posterior aspect of the superior pubic ramus? QID: 3296 Type & Select Correct Answer 1 AP pelvis 0% (4/1852) 2 Outlet obturator oblique view 13% (250/1852) 3 Inlet iliac oblique view 74% (1370/1852) 4 Iliac oblique view 4% (76/1852) 5 Obturator oblique view 8% (147/1852) L 3 Question Complexity A Question Importance Select Answer to see Preferred Response SUBMIT RESPONSE 3 Review Tested Concept Review Full Topic (OBQ10.268) A 78-year-old male undergoes the procedure shown in Figure A for treatment of a femoral neck fracture. As the patient passes through mid-rise during sitting to standing using the affected leg, what portion of the acetabulum experiences the highest contact pressures? QID: 3251 FIGURES: A Type & Select Correct Answer 1 Posterior inferior 4% (76/1696) 2 Anterior superior 17% (288/1696) 3 Posterior superior 76% (1289/1696) 4 Directly superior 2% (29/1696) 5 Anterior inferior 1% (9/1696) L 2 Question Complexity B Question Importance Select Answer to see Preferred Response SUBMIT RESPONSE 3 Review Tested Concept Review Full Topic (OBQ10.180) A 35-year-old male sustains a posterior column/posterior wall acetabular fracture. Which of the following is the preferred approach for open treatment of this injury? QID: 3273 Type & Select Correct Answer 1 Modified Stoppa approach 3% (36/1283) 2 Extended iliofemoral approach 2% (32/1283) 3 Kocher-Langenbeck approach 92% (1182/1283) 4 Ilioinguinal approach 1% (13/1283) 5 Combined anterior and posterior approach 1% (15/1283) L 1 Question Complexity A Question Importance Select Answer to see Preferred Response SUBMIT RESPONSE 3 Review Tested Concept Review Full Topic Sorry, this question is for PEAK Premium Subscribers only Upgrade to PEAK (OBQ09.223) A 37-year-old male sustains the injury shown in Figure A following a motorcycle crash. During the approach, what limb position minimizes tension placed on the sciatic nerve? QID: 3036 FIGURES: A Type & Select Correct Answer 1 Hip at 45 degrees, knee flexed to 90 degrees 6% (218/3518) 2 Hip at 60 degrees, knee flexed to 90 degrees 8% (290/3518) 3 Hip at 90 degrees, knee extended 2% (78/3518) 4 Hip at 0 degrees, knee flexed to 90 degrees 79% (2788/3518) 5 Hip at 90 degrees, knee flexed to 90 degrees 3% (111/3518) L 1 Question Complexity A Question Importance Select Answer to see Preferred Response SUBMIT RESPONSE 4 Review Tested Concept Review Full Topic (OBQ09.144) A computed tomography (CT) scan has been shown to be indicated for evaluation of all of the following aspects of acetabular fractures, EXCEPT: QID: 2957 Type & Select Correct Answer 1 Determination of surgical planning 1% (16/1348) 2 Intra-articular loose bodies 1% (18/1348) 3 Marginal impaction 2% (30/1348) 4 Fracture piece size and position 0% (6/1348) 5 Determination of pre-existing degenerative changes 94% (1269/1348) L 2 Question Complexity C Question Importance Select Answer to see Preferred Response SUBMIT RESPONSE 5 Review Tested Concept Review Full Topic (OBQ09.217) A 22-year-old female is involved in a motor vehicle collision and sustains the injury shown in Figures A through D. According to these images, what is the acetabular fracture classification? QID: 3030 FIGURES: A B C D Type & Select Correct Answer 1 Anterior column posterior hemitransverse 20% (517/2648) 2 Both column 74% (1957/2648) 3 Transverse 1% (34/2648) 4 Transverse with posterior wall 3% (92/2648) 5 Anterior column 1% (36/2648) L 3 Question Complexity A Question Importance Select Answer to see Preferred Response SUBMIT RESPONSE 2 Review Tested Concept Review Full Topic (OBQ09.112) A 33-year-old male sustains the injury seen in Figure A as a result of a high-speed motor vehicle collision. Based on this image, what is the most likely acetabular fracture pattern? QID: 2925 FIGURES: A Type & Select Correct Answer 1 Both column 32% (521/1623) 2 Anterior column 1% (22/1623) 3 Anterior column posterior hemitransverse 5% (81/1623) 4 Transverse 58% (938/1623) 5 T-type 4% (58/1623) L 3 Question Complexity A Question Importance Select Answer to see Preferred Response SUBMIT RESPONSE 4 Review Tested Concept Review Full Topic (OBQ09.163) An acetabular fracture with all segments of the articular surface detached from the intact posterior ilium is defined as what fracture pattern? QID: 2976 Type & Select Correct Answer 1 Transverse 6% (148/2469) 2 Both column 75% (1847/2469) 3 Anterior column posterior hemitransverse 11% (271/2469) 4 Posterior column with posterior wall 5% (135/2469) 5 Anterior column with anterior wall 2% (55/2469) L 2 Question Complexity A Question Importance Select Answer to see Preferred Response SUBMIT RESPONSE 2 Review Tested Concept Review Full Topic (OBQ09.198) A 25-year-old male is involved in a motor vehicle accident and presents with the injury shown in Figure A. Early fixation of this fracture pattern is associated with all of the following EXCEPT? QID: 3011 FIGURES: A Type & Select Correct Answer 1 Decreased length of hospital stay 1% (11/992) 2 Improved functional outcome 3% (28/992) 3 Greater organ dysfunction 86% (858/992) 4 Higher likelihood of being discharged to home as opposed to a rehab facility 4% (41/992) 5 Improved fracture reduction 5% (47/992) L 2 Question Complexity C Question Importance Select Answer to see Preferred Response SUBMIT RESPONSE 3 Review Tested Concept Review Full Topic (OBQ09.137) The pelvic spur sign on plain radiography is indicative of the following injuries? QID: 2950 Type & Select Correct Answer 1 Transtectal transverse acetabular fracture 7% (165/2517) 2 Vertical shear pelvic ring injury 4% (91/2517) 3 Displaced H-type sacral fracture 2% (39/2517) 4 Both column acetabular fracture 86% (2155/2517) 5 Anterior-posterior type III pelvic ring injury 2% (58/2517) L 1 Question Complexity A Question Importance Select Answer to see Preferred Response SUBMIT RESPONSE 4 Review Tested Concept Review Full Topic (OBQ09.99) During the ilioinguinal approach to the pelvis, the corona mortis artery must be identified and ligated if present. The corona mortis artery joins the external illiac artery with which other major artery? QID: 2912 Type & Select Correct Answer 1 Pudendal 2% (54/2468) 2 Deep illiac circumflex 3% (70/2468) 3 Hypogastric 6% (139/2468) 4 Obturator 89% (2196/2468) 5 Testicular 0% (2/2468) L 1 Question Complexity A Question Importance Select Answer to see Preferred Response SUBMIT RESPONSE 4 Review Tested Concept Review Full Topic Sorry, this question is for PEAK Premium Subscribers only Upgrade to PEAK Sorry, this question is for PEAK Premium Subscribers only Upgrade to PEAK Sorry, this question is for PEAK Premium Subscribers only Upgrade to PEAK Sorry, this question is for PEAK Premium Subscribers only Upgrade to PEAK Sorry, this question is for PEAK Premium Subscribers only Upgrade to PEAK Sorry, this question is for PEAK Premium Subscribers only Upgrade to PEAK Sorry, this question is for PEAK Premium Subscribers only Upgrade to PEAK Sorry, this question is for PEAK Premium Subscribers only Upgrade to PEAK Sorry, this question is for PEAK Premium Subscribers only Upgrade to PEAK (OBQ08.119) A 42-year-old female sustains the injury seen in the computed tomography images seen in Figures A and B. According to the Letournel classification, what is the injury pattern shown? QID: 505 FIGURES: A B Type & Select Correct Answer 1 Posterior wall 1% (17/1229) 2 Transverse 80% (982/1229) 3 Anterior wall 2% (24/1229) 4 Posterior column 1% (17/1229) 5 Both column 15% (184/1229) L 3 Question Complexity A Question Importance Select Answer to see Preferred Response SUBMIT RESPONSE 2 Review Tested Concept Review Full Topic (OBQ08.265) Which statement is true with respect to acetabular fracture surgery as the time between injury and surgery increases? QID: 651 Type & Select Correct Answer 1 decreased chance of anatomic fracture reduction 89% (1145/1282) 2 decreased risk of heterotopic ossification 2% (25/1282) 3 decreased rate of neurologic injury 1% (7/1282) 4 decreased rate of infection 1% (13/1282) 5 decreased rate of multi-organ failure 7% (88/1282) L 2