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Yves P Acklin, Raphael Jenni, Heinz Bereiter, Caroline Thalmann, Karl Stoffel
INTRODUCTION: Uncemented short, curved femoral stems may help save proximal bone stock during total hip arthroplasty (THA) and facilitate insertion in minimal invasive surgery. The aim of this 2 year, prospective, single-center study was to examine the stability and migration of the Fitmore (®) stem in THA using model-based radiostereometric analysis (RSA), and thus predict the implant's long-term survival. In addition, we evaluated the stem's clinical performance using standard clinical measures...
February 2016: Archives of Orthopaedic and Trauma Surgery
Michael W Maier, Marcus R Streit, Moritz M Innmann, Marlis Krüger, Jan Nadorf, J Philippe Kretzer, Volker Ewerbeck, Tobias Gotterbarm
BACKGROUND: Short stems have become more and more popular for cementless total hip arthroplasty in the past few years. While conventional, uncemented straight stems for primary total hip arthroplasty (THA) have shown high survival rates in the long term, it is not known whether uncemented short stems represent a reasonable alternative. As cortical hypertrophy has been reported for short stems, the aim of this study was to determine the radiographic prevalence of cortical hypertrophy and to assess the clinical outcome of a frequently used short, curved hip stem...
2015: BMC Musculoskeletal Disorders
Tobias Freitag, Marie-Anne Hein, Dirk Wernerus, Heiko Reichel, Ralf Bieger
INTRODUCTION: Short stem prostheses have been developed to preserve proximal femoral bone stock. This prospective, randomized study compared periprosthetic bone remodelling following short and straight stem implantation 1 year after surgery. MATERIALS AND METHODS: One hundred and forty-four consecutive patients undergoing total hip arthroplasty were randomized to either a Fitmore short or a cementless straight stem (both Zimmer, Winterthur, Switzerland). Periprosthetic bone mineral density (BMD) was measured using dual-energy X-ray absorptiometry performed the day before surgery and at 7 days, 3 months and 1 year postoperatively...
January 2016: Archives of Orthopaedic and Trauma Surgery
Karl Philipp Kutzner, Mark Predrag Kovacevic, Christoph Roeder, Philipp Rehbein, Joachim Pfeil
PURPOSE: Despite the fact that new and modern short-stems allow bone sparing and saving of soft-tissue and muscles, we still face the challenge of anatomically reconstructing the femoro-acetabular offset and leg length. Therefore a radiological and clinical analysis of a short-stem reconstruction of the femoro-acetabular offset and leg length was performed. METHODS: Using an antero-lateral approach, the optimys short-stem (Mathys Ltd, Bettlach, Switzerland) was implanted in 114 consecutive patients in combination with a cementless cup (Fitmore, Zimmer, Indiana, USA; vitamys RM Pressfit, Mathys Ltd, Bettlach, Switzerland)...
July 2015: International Orthopaedics
Philipp von Roth, Carsten Perka, Hermann O Mayr, Bernd Preininger, Friedrich Ziebula, Georg Matziolis, Robert Hube
Bone stock-preserving short stem prostheses have gained importance in total hip arthroplasty (THA) with the use of minimally invasive surgical procedures. Because of their metaphyseal fixation and their dependency on the calcar radius, it is unknown whether the femoral offset can be reproduced with the same accuracy following short stem vs standard stem THA. This study clarifies whether it is possible to restore the femoral offset using a short stem prosthesis (Fitmore; Zimmer, Warsaw, Indiana) compared with a conventional straight stem prosthesis (CLS; Zimmer) following minimally invasive implantation using an anterolateral approach...
July 2014: Orthopedics
Elena Gasbarra, Monica Celi, Fabio L Perrone, Riccardo Iundusi, Luigia Di Primio, Giuseppe Guglielmi, Umberto Tarantino
Currently, an increasing number of younger patients undergo total hip arthroplasty surgery. This has led to a minimal invasive approach and the use of short, bone preserving, femoral stems. In this study, we sought to evaluate osseointegration of the Fitmore stem (Zimmer, Inc; Warsaw, IN) during the first 12 mo after surgery, which reflects the biological phenomenon of osseointegration with radiographic evaluation and bone densitometry (dual-energy X-ray absorptiometry). We evaluated 33 patients (mean age 62...
April 2014: Journal of Clinical Densitometry
Wojciech Pepke, Jan Nadorf, Volker Ewerbeck, Marcus R Streit, Stefan Kinkel, Tobias Gotterbarm, Michael W Maier, J Philippe Kretzer
PURPOSE: After clinical introduction of the Fitmore stem (Zimmer), we noticed the formation of cortical hypertrophies in a few cases. We questioned whether (1) the primary stability or (2) load transfer of the Fitmore stem differs from other stems unassociated with the formation of hypertrophies. We compared the Fitmore stem to the well-established CLS stem. METHODS: Four Fitmore and four CLS stems were implanted in eight synthetic femurs. A cyclic torque around the stem axis and a mediolateral cyclic torque were applied...
March 2014: International Orthopaedics
Qiang Zhang, Cheng-Kung Cheng, Hung-Wen Wei, Xiang Dong, Yi-Ting Chen, Yu-Shu Lai, Yan Wang
BACKGROUND: There is a relatively high failure rate of the femoral component in patients with avascular necrosis at the intermediate-term follow-up. Improving the geometrical fit of the femoral stem against the medullary canal may help to provide long-term survivorship of the hip replacement for patients with avascular necrosis. METHODS: We designed a specific stem, based on morphometric studies of proximal femoral canals in Chinese avascular necrosis patients and evaluated the stem by finite element analyses, comparing the novel stem with two commercially available and commonly used stems...
May 2013: Chinese Medical Journal
K Gustke
The use of short stems has become more popular with the increased interest in less invasive approaches for total hip arthroplasty. The curved broaches and stem can be inserted along a curved track to avoid the abductor attachments. Short stems have the potential of being more bone conserving by allowing for higher neck retention, maintenance of the medial greater trochanter, and preferential stress transfer to the proximal femur. An initial experience with 500 new short stems (Fitmore, Zimmer Orthopedics) stems used for total hip arthroplasty is reported...
November 2012: Journal of Bone and Joint Surgery. British Volume
Marcus R Streit, Kerstin Schröder, Matthias Körber, Christian Merle, Tobias Gotterbarm, Volker Ewerbeck, Peter R Aldinger
PURPOSE: Whilst excellent long-term results with contemporary uncemented stems have been reported for total hip arthroplasty in young patients, the survival rates for the whole reconstruction are often compromised by high failure rates on the acetabular site due to peri-acetabular osteolysis and accelerated wear. METHODS: In patients 60 years old or younger, we retrospectively reviewed the results at a minimum of ten years of 89 consecutive uncemented total hip replacements in 88 patients using the press-fit Fitmore acetabular component in combination with the CLS Spotorno stem and a 28-mm Metasul metal-on-metal articulation or a 28-mm alumina ceramic on conventional polyethylene bearing...
June 2012: International Orthopaedics
Jonathan G Yerasimides
Total hip arthroplasty through a single-incision anterior approach is a minimally invasive surgical (MIS) technique that allows component placement without violation of the posterior hip capsule or "hip deltoid." This allows faster recovery without dislocation precautions. The Fitmore® hip stem (Zimmer, Warsaw, Ind) is a bone-conserving stem designed for use in MIS techniques. The technique described here is a single-incision anterior approach with the Fitmore system using a special orthopedic table.
October 2010: American Journal of Orthopedics
Uma T Vassan, Sanjeev Sharma, Koganti P Chowdary, Manjit S Bhamra
BACKGROUND: Aseptic loosening is the major cause of implant failure. In cemented hip arthroplasty, failure of the acetabular side is mainly due to lysis caused by wear particles. By using an implant with low wear characteristics and by enhancing acetabular fixation using an uncemented implant, we aimed to reduce acetabular lysis and thereby loosening. PATIENTS AND METHODS: This was a retrospective cohort study of 119 hips (101 patients) that had the Uncemented Fitmore cup (Sulzer Orthopedics)...
August 2007: Acta Orthopaedica
Azhar M Merican, Raymond Randle
The Fitmore titanium mesh cementless acetabular component in 115 hip arthroplasties was reviewed at an average of 33 months of follow-up. None were revised nor had infection. One hip dislocated 4 years postoperatively. Two femoral components were revised. The average Harris Hip Score at the last follow-up was 90 points. In the 96 sets of radiographs available, there was no loosening or new radiolucency. One hip had nonprogressive osteolysis adjacent to a screw. This press-fit cup has its polar region flattened and is rim loading...
September 2006: Journal of Arthroplasty
Piergiorgio Marchetti, Roberto Binazzi, Vittorio Vaccari, Mauro Girolami, Francesca Morici, Carlo Impallomeni, Matteo Commessatti, Luciano Silvello
Fitek cementless cups have been adopted in our department in 1989. The first 100 consecutive Fitek implants were analyzed clinically (Harris hip score) and radiographically (anteroposterior and lateral x-rays) with a mean follow-up of 9.7 years. We did not have any case of cup loosening or any other problem requiring cup revision. In this series, we had 86 excellent, 10 good, 2 fair, and 2 poor results. The 2 poor results were because of 2 cases of aseptic loosening of the stem (1 cemented and 1 cementless)...
September 2005: Journal of Arthroplasty
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