Hip Biomechanics and Osteotomies
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1 Hip Biomechanics and Osteotomies
2 Organization Introduction Hip Biomechanics Principles of Osteotomy Femoral Osteotomies Pelvic Osteotomies Summary
3 Inroduction Osteoarthritis is very prevalent Primary OA most common Secondary OA not insignificant Three main pediatric hip pathologies Hip Dysplasia Legg-Calve-Perthes Disease Slipped Capital Femoral Epiphysis
4 Hip Mechanics Hip designed to support BW permit mobility Max ROM 140 flex/ext, 75 add/abd Functional ROM flex/ext x BW through hip Highest ascending stairs
5 Hip Biomechanics Forces acting across a hip joint can be measured either Directly with implanted straingauged endoprosthesis Mathematical model calculations 2D static analysis
6 2D Static Analysis One legged stance 5/6 BW on femoral head Ratio of lever arms to BW 3:1
7 Biomechanics of Cane Cane in Contralateral hand decreases JRF Long moment arm makes so effective 15% BW to cane reduces joint contact forces by 50%
8 Biomechanics Dynamic analysis much more complex Forces across hip joint combination of: Body weight Ground reaction forces Abductor muscle forces
9 Biomechanics Improving abductor function will decrease joint reactive forces
10 Secondary Osteoarthritis Prevalence of OA by age 50 DDH 40-50% LCP 50% SCFE 20% Despite many recent advances arthroplasty has many limitations in younger patients
11 Avoiding Revision Arthroplasty
12 Why does Osteotomy work? Osteotomies improve hip function Increasing contact area / congruency Improve coverage of head Moving normal articular cartilage into weight bearing zone Restore biomechanical advantage / Decreasing joint reactive forces?? Stimulating cartilage repair
13 Principles of Osteotomy Ostoeotomy can be viewed as either Reconstructive Salvage Femoral osteotomy to correct proximal femoral abnormalities and vice versa
14 Pre-op Evaluation Physical exam to ensure ROM Plain films Standing AP Frog leg lateral False profile (anterior lip cover.) Full abduction/adduction CT scan +/- 3D reconstruction
15 Contraindications to Osteotomy Neuropathic arthropathy Inflammatory arthropathy Active infections Severe osteopenia Advanced arthritis/ankylosis Advanced age *smoking, obesity
16 Varus Femoral Osteotomy Intact lateral portion of femoral head is prerequisite Can be combined with either flexion or extension component
17 Varus Osteotomy Indications: hip joint instability b/c femoral deformity which corrects with internal rotation & abduction view Pelvic osteotomy should be performed in pts with CEA < 15 degrees Useful some DDH, SCFE, LCP, AVN and femoral neck nonunion/malunion
18 Disadvantages of varus femoral osteotomy Potential to shorten limb Weaken abductors Trendelenburg gait Potential difficulty with stem insertion in future arthroplasty
19 Valgus Femoral Osteotomy Coxa vara Performed if adduction film reveals concentric reduction
20 Valgus Femoral Osteotomy Moves noninervated inferior cervical osteophytes into contact with flooer of acetabulum Lateral traction on superior capsule may stimulate fibrocartilage transformation
21 Pelvic Osteotomies Reconstructive Salter 18m 6y Pemberton 18m 10y Steel skeletal maturity PAO (Ganz) skeletal maturity Salvage Chiari skeletal maturity
22 Overview of Pelvic Osteotomies
23 Pelvic Osteotomies
24 Salter Osteotomy Single Innominate osteotomy Acetabulum together with ilium and pubis rotated Held by wedge of bone Illiopsoas & adductor tenotomies common 18 mon to 6 years
25 Pemberton Osteotomy Pericapsular osteotomy for residual dysplasia Hinges through the triradiate cartilage must be open!! Changes the volume & orientation of acetabulum Although good results up to 10 most recommend 6 to 8 years
26 Steel Triple Innominate Osteotomy Indication : DDH in older child Need good ROM Secure with bone graft & AO screw fixation
27 Steel Osteotomy Contraindications Limited ROM Incongrous reduction Significant joint space narrowing / degenerative arthritis Two incision approach
28 Periacetabular Osteotomy Devised by Ganz Indication - DDH in adolescents & adults Achieves correction of containment & congruency
29 Periacetabular Osteotomy - Advantages Permits extensive reorientation Preserves blood supply Posterior column remains intact true pelvis unchanged Single incision Preferred reconstructive osteotomy for acetabular dysplasia
30 Periacetabular & Femoral Osteotomy
31 Chiari Osteotomy
32 Chiari Osteotomy Devised by Chiari 1950 s Salvage procedure Relief of pain in incongrous hip Increases coverage by medializing hip centre Fibrocartilage transformation of superior capsule
33 Chiari Osteotomy Results Chiari reported 200 procedures 2/3 good to excellent outcome 1/3 improved Similar results by others While pain relief is predictable, trendelenburg gait remains Trochanteric advancement may alleviate trendelenburg gait
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