Summary THA Revision is most commonly performed to address aseptic loosening, fracture, instability, or infection associated with a prior THA. Diagnosis and etiology of THA failure can be determined by a combination of physical examination, labs, and hip radiographs. Treatment depends on etiology of failure, prior surgery and patient activity demands. Epidemiology Incidence in the United States is projected to increase >100% by 2030 Demographics roughly equal male to female average age of roughly 65-70 in most studies Etiology Pathophysiology femoral component failure acetabular component failure both component failure neither Indications wound healing complications periprosthetic fracture implant fracture hip instability periprosethic joint infection (PJI) adverse local soft tissue reaction (MoM) trunnionosis osteolysis aseptic loosening limb length discrepancy (LLD) Broad categories revision surgery without affecting modular OR nonmodular components revision wound closure psoas release heterotopic bone excision ORIF of periprosthetic fracture revision surgery affecting modular components only femoral head and or polyethyelene exchange titanium sleeve revision surgery nonmodular components acetabular component exchange most common reason for revision in the Charnley "low-friction" total hip arthroplasty femoral component exchange removal of both components replaced with new components replaced with antibiotic spacer girdlestone Classification of Bone Loss Acetabulum AAOS Classification of Acetabular Bone Loss Type I (segmental) Loss of part of the acetabular rim or medial wall Type II (cavitary) Volumetric loss in the bony substance of the acetabular cavity Type III (combined deficiency) Combination of segmental bone loss and cavitary deficiency Type IV (pelvic discontinuity) Complete separation between the superior and inferior acetabulum Type V (arthrodesis) Arthrodesis Paprosky Classification of Acetabular Bone Loss Type I Minimal deformity, intact rim Type IIA Superior bone lysis with intact superior rim Type IIB Absent superior rim, superolateral migration Type IIC Localized destruction of medial wall Type IIIA Bone loss from 10am-2pm around rim, superolateral cup migration Type IIIB Bone loss from 9am-5pm around rim, superomedial cup migration Femur AAOS Classification of Femoral Bone Loss Type I (segmental) Loss of bone of the supporting shell of femur Type II (cavitary) Loss of endosteal bone with intact cortical shell Type III (combined) Combination of segmental bone loss and cavitary deficiency Type IV (malalignment) Loss of normal femoral geometry due to prior surgery, trauma, or disease Type V (stenosis) Obliteration of the canal due to trauma, fixation devices, or bony hypertrophy Type VI (femoral discontinuity) Loss of femoral integrity from fracture or nonunion Paprosky Classification of Femoral Bone Loss Type I Minimal metaphyseal bone loss Type II Extensive metaphyseal bone loss with intact diaphysis Type IIIA Extensive metadiaphyseal bone loss, minimum of 4 cm of intact cortical bone in the diaphysis Type IIIB Extensive metadiaphyseal bone loss, less than 4 cm of intact cortical bone in the diaphysis Type IV Extensive metadiaphyseal bone loss and a nonsupportive diaphysis Presentation Symptoms groin pain --> acetabulum thigh pain --> femoral stem start-up pain --> component loosening night pain --> infection no improvement in pain after surgery --> incorrect diagnosis Physical exam inspection assess wound for infection gait external rotation of the affected extremity present with femoral stem subsidence femoral stems most commonly subside in retroversion range of motion in flexion, extension, abduction looking for restriction of motion or pain avoid positions of dislocation based on THA approach provocative test pain with resisted hip flexion suggests psoas impingement Imaging Radiographs recommended views AP pelvis orthogonal views of involved hip full-length femur radiographs opitional views pre-operative radiographs immediate post-operative radiographs Judet views useful for assessment of columns CT scan indications useful for determining extent of osteolysis radiographs frequently underestimate extent of osteolysis angiogram to determine relationship to neurovascular structures with Paprosky IIIB defects assessment of component position Studies Serum labs infectious laboratories ESR CRP CBC metal levels cobalt and chromium levels trunnionosis THA pseudotumor Aspiration recommended if infectious laboratories are suggestive of infection Treatment Nonoperative indications differing etiology of pain (i.e. back pain, greater trochanteric bursitis, etc.) no identifiable etiology of pain Operative Femoral revision primary total hip arthroplasty components indications minimal metaphyseal bone loss, Paprosky I uncemented extensively porous-coated long-stem prosthesis (or porous-coated/grit blasted combination) or modular tapered stems indications most Paprosky II and IIIa defects; Paprosky IIIb (modular fluted tapered stem) outcomes 95% survival rate at 10-years femoral impaction bone grafting indications large ectactic canal and thin cortices Paprosky IIIb and IV defects outcomes most common complication is stem subsidence allograft prosthetic composite (APC) indications Paprosky IIIb and IV defects endoprosthetic replacement (EPR) indications massive bone loss with a non-supportive diaphysis Paprosky IIIB and IV defects cemented stems indications irradiated bone elderly with severe osteopenia Dorr C femur outcomes high failure rate Acetabular revision porous-coated hemisphere cup or jumbo secured with screws indications at least 50% of bone stock present to support cup disadvantage jumbo cup may disrupt posterior column with additional bone reamed dislocation porous-coated hemispherical cup with acetabular augments indications bone loss (Paprosky defects Type IIB-C and IIIA-B) outcomes 2 year survivorship 94%-100% 5 year survivorship 92%-100% 10 year survivorship 92% reconstruction cage with structural bone allograft indications rim is incompetent (<2/3 of rim remaining), <50% of bone stock present outcomes allograft failure is the most common complication high failure rate (40-60%) without reconstruction cage due to component migration after graft resorption custom triflange cup indications pelvic discontinuity cemented acetabular components can cement a liner by itself or into a well fixed cup liner options e.g. face changing, oblique, lipped, offset, contrained, dual mobility, etc. Combined revision femoral head and polyethylene exchange indications eccentric wear of the polyethylene with stable acetabular and femoral components acute infection trunnionosis outcomes hip instability is the most common complication of isolated liner exchange conversion from a hip arthrodesis indications low back and knee pain as a result of arthrodesis outcomes implant survival greater than 95% at 10 years competence of abductor and gluteal musculature is predictive of ambulatory success improved ipsilateral knee and back pain Revision without changed modular or nonmodular components ORIF periprosthetic fracture indications fracture with stable components psoas release indications painful psoas with clinical signs of impingement and improvement with lidocaine injection can be completed arthroscopically heterotopic bone excisions indications mature heterotopic bone formation causing pain and restricted range of motion Surgical Techniques Femoral revision primary total hip arthroplasty components technique must be sure there is no unexpected bone loss uncemented extensively porous-coated long-stem prosthesis or modular tapered stems technique removal of stem may require extended trochanteric osteotomy (ETO) ETO decreases load to failure (fracture) femoral stem must bypass most distal defect by 2 cortical diameters prevents bending moment through cortical hole cavitary lesions are grafted with particulate graft allograft cortical struts or plates may be used to reinforce cortical defects femoral impaction bone grafting technique morselized fresh-frozen allograft packed into canal smooth tapered stem cemented into allograft allograft prosthetic composite (APC) technique measure host canal size, allograft canal size should be slightly larger than distal host canal mark rotation and make femoral osteotomy (transverse or step) cut on host bone allograft is prepared (usual neck cut and canal reamining) for cementing of fully porous-coated stem host femur is prepared with straight reamers with goal of 4-6cm of good scratch fit distal to osteotomy component is cemented into allograft and press fit into host bone endoprosthetic reconstruction (EPR) technique a sample of bone from distal femoral osteotomy should be sent for frozen section to confirm no tumor cells are present prior to instrumenting option for distal fixation include a cemented stemmed endoprosthesis, compressive osseointegration, or a press-fit fully porous-coated cylindrical stem cemented stems technique bone grafting of any femoral defects prior to cementing ensure canal preparation has removed old cement, neocortex (greater and less troch), and sclerotic bone for cement interdigitation Acetabular revision porous-coated hemisphere cup or jumbo secured with screws technique cavitary lesions are filled with particulate graft cup placement should be inferior and medial lowers joint reactive forces metallic wedge augmentation may be used if cup in good position and rigid internal fixation is achieved jumbo cups may be used when larger reamer is needed to make cortical contact structural allografts may be used to provide stability while bone grows into cementless cup porous-coated hemispherical cup with acetabular augments technique gentle reaming to smooth the acetabulum and minimizing the removal of good supportive bone assess cup size with trials and location for augments fix the augment with screws place small amount of cement on the augment and place real cup to unite the augment to the cup place screws in the cup, goal is to have a screw go through the cup and augment reconstruction cage and structural bone allograft technique polyethylene cup is cemented into reconstruction cage bone graft placed behind cage custom triflange technique sterilize custom triflanged acetabular component (CTAC) model for intraopeative reference removal of prior implant and assess needed excess bone removal place iliac flange first followed by pubic and ischial flange secure with screw fixation consider placement of posterior column plate cemented cup technique cement polyethylene into stable cup Combined revision Femoral head and polyethylene exchange technique exchange both head and liner osteolytic defects may be bone grafted through screw holes to fill bony defects Conversion from hip arthrodesis technique osteotomy of remaining greater trochanter femoral neck ostoetomy and acetabular reaming can be done under radiographic guidance given limitations in bony landmarks consideration for revision cup and femoral stem as well as dual mobility or constrained liner given high dislocation rate if abductor deficiency can perform glut max transfer along with the tensor fascia lata, the anterior aspect of the gluteus maximus is freed and transferred to the greater trochanter so that the fibers are similarly oriented to the native abductor musculature Revision without changed modular or nonmodular components ORIF periprosthetic fracture technique assess stability of components, if stable treat fracture and if unable revise see topic page psoas release technique see topic page heterotopic bone (HO) excision technique await maturation of bone excision of bone should be followed by HO prophylaxis of either NSAIDs, radiation, or both. Prognosis Lower mid-term and long term survival compared to primary THA with higher rates of complications dislocation (even in simple procedures) infection nerve palsy fractures abductor deficiency DVT limb length discrepancy
QUESTIONS 1 of 39 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 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 (OBQ18.248) A 72-year-old male presents with worsening left hip pain 12 years after total hip arthroplasty. On examination, the patient has a Trendelenburg gait with a 3.5 cm leg length discrepancy. The patient denies any fevers or chills. Current radiographs are shown in figure A. Recent ESR and CRP are 21 mm/hr and 1.2 mg/L, respectively. What is the preferred treatment option to address these findings? QID: 213144 FIGURES: A Type & Select Correct Answer 1 Large porous hemispheric cup with particulate bone graft and augmented with screw fixation 26% (543/2058) 2 Custom triflanged acetabular component 14% (295/2058) 3 Cemented large porous hemispheric cup 3% (52/2058) 4 Metal augments with large porous hemispheric cup and bone grafting combined with screw augmentation 48% (998/2058) 5 2-stage revision arthroplasty 7% (140/2058) L 4 Question Complexity A Question Importance Select Answer to see Preferred Response SUBMIT RESPONSE 4 Review Tested Concept Review Full Topic (OBQ18.247) Figure A depicts the current radiograph of a 66-year-old man with significant right groin pain after undergoing right total hip arthroplasty (THA) 10 years ago. Revision surgery is planned after infection workup is negative. What is the classification of his diagnosis and what would the most appropriate treatment for the acetabulum? QID: 213143 FIGURES: A Type & Select Correct Answer 1 Paprosky I; cementless hemispheric cup with screw fixation 36% (928/2549) 2 Paprosky I; cemented hemispheric cup without screw fixation 4% (98/2549) 3 Paprosky IIB; cementless hemispheric cup with screw fixation 53% (1341/2549) 4 Paprosky IIIA; cup/cage construct 5% (116/2549) 5 Paprosky IIIA; triflange reconstruction 1% (34/2549) N/A Question Complexity A Question Importance Select Answer to see Preferred Response SUBMIT RESPONSE 3 Review Tested Concept Review Full Topic (OBQ18.65) A 77-year-old patient presents with progressively worsening right hip pain and limp. The patient underwent a right revision total hip arthroplasty 15 years ago and is now unable to ambulate due to the pain and feels as if the hip is unstable. The patient's radiograph is shown in Figure 1. Which of the following is the appropriate classification and best treatment approach for this patient? QID: 212961 FIGURES: A Type & Select Correct Answer 1 Paprosky 2A; multihole cup with posterior column plating 1% (34/2771) 2 Paprosky 2B; antiprotrusio cage with structural allograft 15% (402/2771) 3 Paprosky 3A; distraction arthroplasty 2% (63/2771) 4 Paprosky 3B; custom triflange cup 80% (2207/2771) 5 Paprosky 3B; cemented cup 1% (30/2771) 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 (OBQ16.243) An 80-year-old female presents following a fall from standing. She was an active, independent, community ambulator prior to this event. Past surgical history is significant for a left total hip arthroplasty 10 years prior. A left hip XR is obtained and shown in Figure A. A CT is obtained and demonstrates a displaced transverse acetabulum fracture with medial cup migration. There is no evidence of femoral component loosening or fracture. There is no concern for infection and all inflammatory markers are within appropriate limits. Which treatment is most appropriate? QID: 9005 FIGURES: A Type & Select Correct Answer 1 Restricted weight bearing 5% (135/2675) 2 Acetabular revision with a custom triflange implant 23% (618/2675) 3 Dual approach pelvic ORIF and acetabular revision 22% (600/2675) 4 Acetabular revision with cup-cage construct 40% (1062/2675) 5 Acetabular revision with placement of a jumbo cup 9% (237/2675) L 4 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 (SBQ13HK.2.1) A 65-year-old male presents to your clinic for evaluation of right hip pain. He underwent a right total hip arthroplasty (THA) 20 years prior and was doing very well until 2 years ago. He admits to groin pain when getting up from a seated position. He denies any fevers or chills. Radiograph is shown in Figure A. Which of the following would preclude the patient from undergoing a single-stage surgical intervention without further workup? QID: 213829 FIGURES: A Type & Select Correct Answer 1 Elevated serum cobalt 2% (43/1908) 2 Metallosis noted intra-operatively 3% (48/1908) 3 Significantly higher serum cobalt then serum chrome levels 2% (42/1908) 4 Elevated ESR and CRP 86% (1647/1908) 5 Pseudotumor noted on MRI 6% (108/1908) L 3 Question Complexity B Question Importance Select Answer to see Preferred Response SUBMIT RESPONSE 4 Review Tested Concept Review Full Topic (OBQ13.272) A 72-year-old patient is scheduled to undergo revision total hip arthroplasty. A 3D-model of the patient's hemipelvis is constructed for pre-operative planning and is shown in Figure A. A custom-designed implant shown in Figure B is created. Which of the following is TRUE of the planned reconstruction? QID: 4907 FIGURES: A B Type & Select Correct Answer 1 The implant is a bilobed cup. 4% (203/5025) 2 The most common complication is dislocation. 54% (2711/5025) 3 The acetabular defect can be classified as AAOS Type V. 24% (1230/5025) 4 Radiation-compromised bone stock is a contraindication. 9% (476/5025) 5 The winged profile of the implant facilitates insertion through both anterior and anterolateral approaches. 8% (381/5025) L 4 Question Complexity B 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 (OBQ12.17) A 71 year old gentleman underwent left total hip arthroplasty 10 years ago. Eighteen months ago he began having hip and thigh pain. Over the past 6 weeks, the pain has become excruciating and he has been unable to ambulate, even with the aid of a walker. He has mild pain with passive internal and external rotation of the hip. He is unable to ambulate in the office. Laboratory values are notable for a WBC of 10,300, CRP of 0.2, and ESR of 13. A radiograph is provided in figure A. Which of the following is the best treatment option? QID: 4377 FIGURES: A Type & Select Correct Answer 1 Radionuclide bone scan and MRI 3% (208/6875) 2 Open reduction internal fixation with a cable plate and allograft strut 4% (307/6875) 3 Revision arthroplasty with a fully coated cementless stem, cable wiring, and bone graft 59% (4061/6875) 4 Revision arthroplasty with a modular, tapered stem and bone grafting of the diaphyseal fixation 25% (1712/6875) 5 Revision arthroplasty with a total femur prosthesis 8% (538/6875) L 3 Question Complexity B Question Importance Select Answer to see Preferred Response SUBMIT RESPONSE 3 Review Tested Concept Review Full Topic (OBQ12.16) Which of the following statements is true regarding the thirty-year follow-up data obtained from the Charnley "low-friction" total hip arthroplasty? QID: 4376 Type & Select Correct Answer 1 Acetabular component failure was the least common reason for revision surgery 5% (290/5731) 2 The number of revisions required for periprosthetic fractures was higher than that for deep infections 5% (301/5731) 3 Acetabular component failure was a more common reason for revision than deep infection 62% (3531/5731) 4 Femoral component failure was a more common reason for revision than acetabular component failure 17% (971/5731) 5 Deep infection was the most common reason for revision 10% (579/5731) L 3 Question Complexity C Question Importance Select Answer to see Preferred Response SUBMIT RESPONSE 3 Review Tested Concept Review Full Topic (OBQ12.149) A 91-year-old male with a history of chronic leukemia and dementia falls and sustains the hip fracture shown in Figure A. He undergoes a hemiarthroplasty through a posterior approach. A post-operative radiograph is shown in Figure B. Three weeks later he dislocates the hip arising from the toilet seat. A radiograph is shown in Figure C. The patient undergoes a closed reduction and is placed in a hip abduction brace. Post reduction radiograph is shown in Figure D. One month later he returns to clinic complaining of pain and inability to bear weight through the leg. A radiograph of the hip is included in Figure E. Which of the following factors has MOST likely contributed to the instability of the hip hemiarthroplasty? QID: 4509 FIGURES: A B C D E Type & Select Correct Answer 1 Femoral stem subsidence 2% (75/4843) 2 Increased offset 12% (563/4843) 3 Inadequate femoral stem neck length 13% (621/4843) 4 Patient's dementia status 72% (3506/4843) 5 Patient's gender 1% (35/4843) L 4 Question Complexity C Question Importance Select Answer to see Preferred Response SUBMIT RESPONSE 4 Review Tested Concept Review Full Topic (OBQ12.67) A 72-year old female who underwent an uncemented right total hip arthroplasty 2 years ago complains of right hip pain after a fall. Figure A shows her current radiograph. Which acetabular bone defect classification and treatment option best describes this scenario? QID: 4427 FIGURES: A Type & Select Correct Answer 1 AAOS Type III - anti-protrusio cage with augmentation and a posterior column plate 24% (1170/4868) 2 AAOS Type IV - anti-protrusio cage with screw fixation and a posterior column plate 62% (3006/4868) 3 AAOS Type II - jumbo cup with augmentation and a posterior column plate 8% (366/4868) 4 AAOS Type I - total acetabular allograft with a cemented cup 1% (59/4868) 5 AAOS Type II - custom triflange acetabular component 5% (224/4868) L 4 Question Complexity B Question Importance Select Answer to see Preferred Response SUBMIT RESPONSE 2 Review Tested Concept Review Full Topic (OBQ12.50) A 74-year-old man presents with start-up thigh pain following a total hip replacement 10 years ago. Immediate post-operative radiograph is shown in Figure A. A current radiograph is shown in Figure B. Aspiration of the hip yields 1,005 white blood cells/ml. ESR is 12 (normal <40) and CRP is 0.4 (normal <1.2). Which of the following is the most appropriate management at this time? QID: 4410 FIGURES: A B Type & Select Correct Answer 1 Revision of the femoral component to an uncemented, long, fully porous-coated stem 78% (4187/5377) 2 Revision of the femoral component to a cemented stem 17% (889/5377) 3 Revision of the femoral component to an allograft prosthetic composite 2% (96/5377) 4 Revision of the femoral component to a proximal femoral replacement 1% (74/5377) 5 Removal of prosthesis with insertion of antibiotic spacer 2% (86/5377) L 2 Question Complexity B Question Importance Select Answer to see Preferred Response SUBMIT RESPONSE 1 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 This is an AAOS Self Assessment Exam (SAE) question. Orthobullets was not involved in the editorial process and does not have the ability to alter the question. If you prefer to hide SAE questions, simply turn them off in your Learning Goals. (SAE10HK.15) A 71-year-old woman with coronary artery disease underwent an uncomplicated right total hip arthroplasty for osteoarthritis 12 years ago. Her hip has functioned well until approximately 18 months ago when she noted the spontaneous onset of groin, buttock, and proximal thigh pain that is present at rest and made worse with activity. A radiograph is shown in Figure 15. What is the recommended management at this point? QID: 7003 FIGURES: A Type & Select Correct Answer 1 Immediate admission to the hospital and emergent revision hip arthroplasty 3% (20/686) 2 Reassurance and follow-up if symptoms worsen 1% (10/686) 3 Repeat radiographs in 1 month 2% (16/686) 4 Protected weight bearing with urgent revision hip arthroplasty when the patient is medically cleared 89% (608/686) 5 A prescription for alendronate and reevaluation in 1 year 4% (28/686) L 1 Question Complexity E 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 (OBQ10.187) Which of the following is true regarding the conversion of hip arthrodesis to total hip arthroplasty? QID: 3280 Type & Select Correct Answer 1 Implant survivorship is greater than 95% at 20 years following conversion to arthroplasty 5% (207/3931) 2 Conversion to arthroplasty should not be performed if arthrodesis is more than 15 years old 7% (269/3931) 3 Function of gluteus medius is predictive of ambulatory status 84% (3296/3931) 4 Rate of complication is equivalent to primary total hip arthroplasty 2% (73/3931) 5 Incidence of nerve palsy is comparable to primary total hip arthroplasty 1% (58/3931) L 2 Question Complexity C 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 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 (OBQ08.148) A 85-year-old man who underwent hemiarthroplasty 5 years ago now complains of thigh pain for the past four months. Laboratory studies show a normal white blood cell count (WBC), erythrocyte sedimentation rate (ESR) and C-reactive protein (CRP). An aspiration of the hip is performed and is negative for infection. A radiograph is shown in Figure A. Which of the following is the best management option for the femoral implant? QID: 534 FIGURES: A Type & Select Correct Answer 1 Bone scan to look for loosening 11% (275/2478) 2 Touch down weight bearing and physical therapy 1% (25/2478) 3 Revision with a tumor prosthesis 3% (63/2478) 4 Revision of femoral component with metaphyseal cement fixation of the stem 14% (348/2478) 5 Revision to a cementless femoral component with diaphyseal press-fit fixation of the stem 71% (1756/2478) L 3 Question Complexity C Question Importance Select Answer to see Preferred Response SUBMIT RESPONSE 5 Review Tested Concept Review Full Topic Sorry, this question is for PEAK Premium Subscribers only Upgrade to PEAK (OBQ08.217) A 67-year-old female with history rheumatoid arthritis presents with acute onset severe left hip pain eight years status-post total hip arthroplasty. She is unable to weight bear on the left leg, but denies any other pain or systemic symptoms. A current radiograph of the pelvis is shown in Figure A. What is the most likely cause of the patient's current hip pain symptoms? QID: 603 FIGURES: A Type & Select Correct Answer 1 Poor surgical technique 1% (51/3683) 2 Rheumatoid arthritis flare 2% (62/3683) 3 Catastrophic implant failure 17% (632/3683) 4 Development of pelvic discontinuity 79% (2895/3683) 5 Acute sepsis 1% (29/3683) L 2 Question Complexity C Question Importance Select Answer to see Preferred Response SUBMIT RESPONSE 4 Review Tested Concept Review Full Topic This is an AAOS Self Assessment Exam (SAE) question. Orthobullets was not involved in the editorial process and does not have the ability to alter the question. If you prefer to hide SAE questions, simply turn them off in your Learning Goals. (SAE07HK.67) What are the optimal conditions for leaving the acetabular shell in place, replacing the acetabular liner, and grafting the osteolytic defect shown in Figure 39? QID: 6027 FIGURES: A Type & Select Correct Answer 1 Nonmodular implant 2% (18/886) 2 Instability 2% (17/886) 3 Well-designed, well-fixed modular implant 93% (820/886) 4 Complete radiolucency of the acetabular component 1% (11/886) 5 Migration of the acetabular component 2% (16/886) L 1 Question Complexity E Question Importance Select Answer to see Preferred Response SUBMIT RESPONSE 3 Review Tested Concept Review Full Topic This is an AAOS Self Assessment Exam (SAE) question. Orthobullets was not involved in the editorial process and does not have the ability to alter the question. If you prefer to hide SAE questions, simply turn them off in your Learning Goals. (SAE07HK.74) Figure 44 shows the radiograph of a 65-year-old man who underwent a revision arthroplasty to remove a loose, cemented femoral stem. When planning the postoperative restrictions, the surgeon should be aware that QID: 6034 FIGURES: A Type & Select Correct Answer 1 the approach used reduces the torque-to-failure (fracture) of the construct to less than 50% of the intact femur. 28% (202/715) 2 the technique of repair can return the reconstructed prosthesis/bone composite to nearly the strength of the intact femur. 24% (171/715) 3 there is no relationship between the density of the native bone and the strength of the prosthesis/bone composite. 4% (29/715) 4 the addition of bone graft substitute or autograft has been shown to lessen the time to complete healing. 15% (105/715) 5 there is a one in five chance of fracture with this technique; therefore, the surgeon must carefully weigh the potential benefits versus this risk. 28% (199/715) N/A Question Complexity E Question Importance Select Answer to see Preferred Response SUBMIT RESPONSE 1 Review Tested Concept Review Full Topic This is an AAOS Self Assessment Exam (SAE) question. Orthobullets was not involved in the editorial process and does not have the ability to alter the question. If you prefer to hide SAE questions, simply turn them off in your Learning Goals. (SAE07HK.21) A 72-year-old woman who underwent right total hip arthroplasty 7 years ago now reports right hip pain and limb shortening. Studies for infection are negative. AP and lateral radiographs are shown in Figures 13a and 13b. What is the most appropriate management? QID: 5981 FIGURES: A B Type & Select Correct Answer 1 Observation only 0% (0/762) 2 Nonsteroidal anti-inflammatory drugs and protected weight bearing 1% (4/762) 3 Revision of the acetabular component with a jumbo cup with screws 11% (85/762) 4 Revision of the acetabular component with a reinforcement cage and bone grafting 88% (668/762) 5 Resection arthroplasty 0% (2/762) L 1 Question Complexity E Question Importance Select Answer to see Preferred Response SUBMIT RESPONSE 4 Review Tested Concept Review Full Topic (OBQ06.174) Figure A shows an AP hip radiograph of a 72-year-old woman who had had a right total hip arthroplasty fifteen years previously. CT imaging of the affected hip shows non-contained defects in both the anterior and posterior columns of the peri-acetabular region affecting greater than 50% of the weight bearing surface. Which of the following revision procedures would restore the most acetabular bone stock and be most appropriate for this patient? QID: 360 FIGURES: A Type & Select Correct Answer 1 Morselized allograft and/or autograft bone, combined with a cemented acetabular component 4% (167/4119) 2 Acetabular revision with use of a bilobed cementless component and morselized allograft 8% (317/4119) 3 Morselized allograft and/or autograft bone, combined with a cementless acetabular component 7% (278/4119) 4 Revision using an ilioischial reconstruction ring acetabular component and structural corticocancellous graft 69% (2842/4119) 5 Revision using a roof ring acetabular component and structural corticocancellous graft 12% (492/4119) L 3 Question Complexity D Question Importance Select Answer to see Preferred Response SUBMIT RESPONSE 4 Review Tested Concept Review Full Topic
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