Advertisement for orthosearch.org.uk
Results 1 - 2 of 2
Results per page:
Orthopaedic Proceedings
Vol. 99-B, Issue SUPP_4 | Pages 112 - 112
1 Feb 2017
Chun C Chun K Baik J Lee S
Full Access

Purpose

To compare and analyze the long term follow up clinical & radiological result after utilization of fixed-type & rotating-type implant for high flex both total knee replacement.

Subject & Method

This paper targeted 45 patients, 90 cases that got high flex both total knee replacement with utilization of fixed-type implant(LPS-flex®) & rotating-type implant(P.F.C® Sigma RP-F) for 1 patient by 1 operator(C.C.H) in our hospital from 2005.01 to 2006.11. Preoperative diagnoses were degenerative arthritis (43 patients, 86 cases), rheumatic arthritis (2 patients, 4 cases), mean age at the operation was 66.4 years old(54∼78), 3 men, 42 women, mean follow up period was 110.8months(97∼120). We compared and estimated Hospital for Special Surgery(HSS) score and Knee Society Score(KSS), Western Ontario and MacMaster Universities Osteoarthritis(WOMAC) score and mean range of motion of knee joint at pre-operation and last follow up for functional & clinical evaluation. And we compared and estimated change of femorotibial angle and radiolucency through erect AP & lateral x-ray at pre-, post-operation and last follow up using American Knee Society Roentgen Graphic Evaluation for radiological evaluation.


Orthopaedic Proceedings
Vol. 86-B, Issue SUPP_IV | Pages 406 - 406
1 Apr 2004
Ohashi H Kobayashi A Kadoya Y Yamano Y Tanabe Y
Full Access

Impaction allografting is one of the techniques for reconstruction of femur during revision total hip arthroplasties. The initial stability of the stem fixed with impacted morsellized allogtafts and cement depends on multiple factors. The aim of this study was to investigate the stability of stem in reference to the size of bone chips, femoral bone defect and implant design. Morsellized grafts of human femoral heads were prepared using a reciprocating type bone mill or a rotating type bone mill. Femoral bone defect was created at proximal medial cortex. Two types of polished stem were tested; CPT stem and VerSys CT stem (Zimmer Inc.). The cross section of the stem was relatively rectangular in CPT stem, while round in VerSys CT stem. Morsellized grafts were impacted into an over-reamed plastic bone and the stem was fixed with PMMA bone cement. Cyclic compression test and torsional test were performed using an Instron type machanical tester. Bone chips prepared by a reciprocating type bone mill contained large chips with broad size distribution, which represented high stiffness in compression test and high maximum torque in torsional test. Femoral bone defect and implant geometry did not affect the axial stability of stem, while large bone defect and round shape stem showed significantly lower maximum torque. These results indicated that the size of bone chips, femoral bone defect and implant geometry affected the initial stability of the stem. Impaction grafting seems to be a technically demanding procedure, however several factors can be controlled to obtain secure implant stability