Laura M. Fayad, MD. Associate Professor of Radiology, Orthopaedic Surgery & Oncology The Johns Hopkins University
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1 Society of Pediatric Radiology, May 2013 Laura M. Fayad, MD Associate Professor of Radiology, Orthopaedic Surgery & Oncology The Johns Hopkins University
2 Describes surgical techniques that resect and reconstruct a limb with an acceptable oncologic, functional and cosmetic result. Today, 70-90% of extremity OGS treated with LSS
3 Indications: Adequate margins Acceptable functional and cosmetic result Relative contraindications: Pathologic fracture Neurovascular encasement Poorly placed biopsy tract
4
5 T1 Fluid Sensitive: FS T2 / STIR
6 Radiology 1988; 168: Spin Echo T1 weighting: Most important sequence!
7 T1-weighted
8 Differentiate red marrow from tumor: Red marrow greater signal than skeletal muscle
9 Differentiate red marrow from tumor: Red marrow increased signal compared with adjacent Disk
10 ? T1 STIR
11 T1 weighted in-phase & opposed-phase gradient echo Sensitivity=85-95%, Specificity=80-95%* * Zajick et al. Radiology Nov;237(2): *Zampa, V et al. Eur Radiol 2002 Jul;12(7): *Disler, DG et al. AJR Am J Roentgenol Nov;169(5):
12 T1 In phase Opposed phase 40 y.o. woman with back pain; unsuspected metastatic breast cancer
13 T1 Spin Echo In phase Opposed phase
14 Indications: Adequate margins Acceptable functional and cosmetic result Relative contraindications: Pathologic fracture Neurovascular encasement Poorly placed biopsy tract
15 Imaging techniques Surgical techniques Normal post-operative course Complications
16 Radiography Routine in immediate post-op period Documents hardware position Serial radiographs Monitor healing Detect complications
17 89-y.o. woman with history of right bipolar hemiarthroplasty secondary to destructive lymphoma presenting with progressive pain, swelling, and inability to bear weight. PROTRUSION of acetabular component Heterotopic bone
18 MRI Unparalleled contrast resolution. Therefore, ideal for detecting recurrence. But, limited in presence of metal
19 MDCT Streak artifacts reduced by metal reduction techniques
20 MDCT Cross-sectional imaging: Particle disease
21 Fritz J, Fishman EK, Corl F, Carrino JA, Weber KL, Fayad LM. AJR 198(3):647-60
22 Post-processing techniques MPR 3D CT (volume rendering)
23 Tumor excision + wide margin Reconstruction of surgical defect
24 Small resection cavity: Autograft Large resection cavity (more commonly) Allograft Graft-prosthesis composite Endoprosthesis
25 Autograft: tissue grafted into a new position in the body of the same individual Example: vascularized fibular graft
26 Often, allografts & endoprostheses are required because of the limited size and shape of autografts Potential for donor site morbidity
27 Allograft: tissue obtained from a donor of the same species, but with a different genotype from the recipient Typically, fresh deep-frozen cadaver grafts Restore size and shape of original bone after tumor resection
28 Fritz J, Fishman EK, Corl F, Carrino JA, Weber KL, Fayad LM. AJR 198(3):647-60
29 Intercalary Allograft Osteoarticular Allograft Graft-prosthesis Composites
30 Tumor of diaphysis or metadiaphysis Intercalary graft: Preserves ends of bone Combined with fibular graft to augment healing
31 2 years later: complete healing of allograft-host junction
32 Fritz J, Fishman EK, Corl F, Carrino JA, Weber KL, Fayad LM. AJR 198(3):647-60
33 Delayed union/nonunion Infection Fracture Nonunion
34 For reconstruction of one side of a joint Accurate anatomic matching of size and shape between the host defect and the graft optimizes the functional life of the graft.
35 Or, replacement of location where prosthesis not readily available (ex: radius)
36 Fritz J, Fishman EK, Corl F, Carrino JA, Weber KL, Fayad LM. AJR 198(3):647-60
37 Delayed union/nonunion Bone graft fractures Infection Cartilage degeneration Joint instability *up to 70% complication Kattapuram SV, Phillips WC, Mankin HJ. Giant cell tumor of bone: radiographic changes following local excision and allograft replacement. Radiology 1986; 161: Ogilvie CM, Crawford EA, Hosalkar HS, King JJ, Lackman RD. Long-term results for limb salvage with osteoarticular allograft reconstruction. Clin Orthop Relat Res 2009; 467:
38 Allograft does not need to be perfectly size-matched to the host bone. Allografts provide tendinous attachments for reconstructions of the extensor mechanism in the knee, the rotator cuff in the shoulder, or the abductor muscles in the hip
39 Prosthesis cemented into segmental allograft
40 Bone graft fracture Nonunion Infection Fracture
41 Megaprosthesis:large metallic device designed to replace the excised length of bone and the adjacent joint
42 Modular endoprostheses for limb salvage surgery permit reconstruction of a wide variety of defects using standard components, as opposed to expensive custom implants. Prostheses are assembled intra-operatively and provide flexibility for the margin of tumor resection. May be expanded when used for reconstruction in skeletally immature patients.
43 Establishes a stable and mobile articulation between the femur and a partially resected pelvis.
44
45 For diaphyseal lesions that extend proximally to the lesser trochanter and distally to the distal diaphysismetaphysis junction
46 Maintenance of limb length after resection Cope with child s functional/recreational demands
47 12y.o. OGS
48 Infection Implant dislocation Mechanical failure Aseptic loosening Instability Tumor progression/recurrence
49
50
51
52
53 T1 FS T2 STIR DCE
54 Limb salvage surgery: the standard of care for sarcomas Reviewed surgical techniques Post-surgical imaging: important to management
55 Thank you!
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