髌股关节置换

1、Patellar Femoral Replacement Paul A Lotke MD Hospital of the University of Pennsylvania,The patella has always been a problem,Patello-Femoral Osteoarthritis: Prevalence High in patients with sx & OA, Women24 %,Men11%,The treatment alternatives have not been good Patellectomy Tibial tubercle “unloadi

2、ng osteotomies” Arthroscopic chondroplasty Lateral releases Micro-fracture Autogenous Chondrocyte Implant ACI Mosaicplasty,The classic results: 66% G/E,Therefore, the need for a good patellofemoral replacement The first: a DePalma patellar prosthesis (early 70s) 1973,Who is the best candidate for a

3、PF replacement? The elderly with isolated patellar arthritis Do well with TKA The young with patellar arthritis No long term data available best for Middle aged who can convert to TKA?,Patient selection Lonner JAAOS 2004 Isolated patellar arthritis Severe pain and functional disability Middle aged A

4、void inflammatory arthritis Avoid severe mal-tracking Avoid any Fem-Tib arthritis Avoid laborers or high activity patients Avoid elderly (use TKA),Surgical technique 53 yo female 10 + yr hx increasing disbility,Surgical technique,Surgical technique: set trochlear component parallel to transepicondyl

5、ar axis,Surgical technique: resect trochlear cartlage,Surgical technique: reproduce patellar thickness assess patellar tracking lateral release if needed,Clinical Results Scattered reports over past two decades Inconsistent indications and assessments However, results reasonably consistent 75-86 % G

6、/E Most of the problems were from Patellar instablity Cartilage contact in flexion,Patellar Instability Related to Uncorrected malalignment Soft tissue inbalance Component malposition Design flaws,Cartilage contact in flexion 32 yr (!) female with pain 1 yr after a PFA excellent exam,Cartilage conta

7、ct,Patellar contact patterns,Cartilage contact,Clinical results good potential for relief pain Are they predictable ?,Clinical results, Lonner2003 # 25 44yr F/U 1 yrG/E 96 %, Lonner2003 # 30 38yr F/U 4 yrG/E 84 %, Kooijman 2003 # 45 50yr F/U 17 yr G/E 86%, Smith2002 # 45 72yr F/U 4 yrG/E 69%, Ackroyd2003 # 95naF/U 4 yrG/E 83 %, DeWinter 2001 # 2659yr F/U 11yrG/E 76 %,Summary PF replacement Relatively high prevalence PF arthritis Need for reliable PF replacement Newer designs