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An initial transient decrease of the bone mineral density (BMD) occurred between 1 week and 3months after surgery, then bone mass returns to baseline values after 6 months and increased at12 months. No radiolucent lines nor osteolysis have reported and no revision occurred.There were 2 complications not related to the implant on study: one dislocation solved with aclose reduction and one dislocation solved with a revision of the neck and the head, but notcompromising the cup.CONCLUSIONS: Delta TT acetabular cup allows to obtain a very good primary stability,thanks to the high friction coefficient of the Trabecular Titanium TM , followed by a good andfast osteointegration, as reported by early DEXA outcomes. Preliminary results showed also avery good clinical and functional improvement. Long-term follow-up is ongoing in order toprove these promising results.Friday, October 8, 2010, 11:00-11:50Session B11: Knee MechanicsThe Influence of Pre-Operative Deformity on Intra-Operative Soft TissueBalance in Posterior-Stabilized Total Knee Arthroplasty*Tomoyuki Matsumoto - Kobe University Graduate School of Medicine - Kobe, JapanSeiji Kubo - Kobe University - Kobe, JapanHirotsugu Muratsu - Nippon Steel Hirohata Hospital - Himeji, JapanKazunari Ishida - Hyogo Rehabilitation Centre Center Hospital - Kobe, JapanKoji Takayama - Kobe University Graduate School of Medicine - Kobe, JapanTakehiko Matsushita - Kobe University Graduate School of Medicine - Kobe, JapanKatsumasa Tei - Department of Orthopaedic surgery, Mitsubishi Kobe Hospital - Kobe city,JapanMasahiro Kurosaka - Kobe University Graduate School of Medicine - Kobe, JapanRyosuke Kuroda - Department of Orthopaedic Surgery, Kobe University Graduate School ofMedicine - Kobe, JapanAbstract*Email: matsun@m4.dion.ne.jpUsing a tensor for total knee arthroplasty (TKA) that is designed to facilitate soft tissue balancemeasurements with a reduced patello-femoral (PF) joint, we examined the influence of preoperativedeformity on intra-operative soft tissue balance during posterior-stabilized (PS) TKA.Joint component gap and varus angle were assessed at 0, 10, 45, 90 and 135° of flexion withfemoral trial prosthesis placed and PF joint reduced in 60 varus type osteoarthritic patients. Jointgap measurement showed no significant difference regardless the amount of pre-operative varusalignment. With the procedures of soft tissue release avoiding joint line elevation, however,intra-operative varus angle with varus alignment of more than 20 degrees exhibited significantlarger values compared to those with varus alignment of less than 20 degrees throughout therange of motion. Accordingly, we conclude that pre-operative severe varus deformity may havethe risk for leaving post-operative varus soft tissue balance during PS TKA.file:///E|/ISTA2010-Abstracts.htm[12/7/2011 3:15:47 PM]