MiniHip™ - The evidence base
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3A ODEP rating, demonstrating 99.5% survivorship at 3 years for aseptic loosening Total number of patients 175 (89 male; 86 female) Mean age Mean follow-up Survival rate (aseptic loosening)

1. MiniHip™ 5 year data Title Authors Publication Short and medium term results of cementless short stem prosthesis MiniHip™ Seeger JB, Stallmann N, Jerosch J Presented DKOU Berlin 2015 This was a retrospective study with 172 patients (191 hips) with MiniHip™ implantation carried out at 2 centres. Average age of the patients was 59.5 years (± 10.6 years). Follow-up period was 3.7 years (± 0.7 years) HOOS and OHS questionnaires were completed preoperatively, in 2011, 2012 and 2013 there was also a EQ 5D quality of life questionnaire and radiographic evaluation sheets. The table below shows...

2. Physiological bone loading Title Authors Publication Load transfer into the proximal femur: are short stems more advantageous with respect to the mechanical environment? Simpson D, Yeoman M, Lowry C, Cizinauskas A, Vincent G, Jerosch J, Collins S AAOS 2011 poster presentation Finite element models of two implants, MiniHip™ and a conventionally loaded HA coated hip stem, were used to simulate bone remodelling under physiological load condition (45% gait). The correctly sized MiniHip™ transferred considerably more load into the proximal femur, and resulted in nearly twice the medial...

3. Good short-term results for bone conservation Title Authors Publication A report on the short-term outcomes of 101 MiniHip™ short femoral stems Woodnutt D Presented at AOA and NZ combined, Rotorua New Zealand 2011 This poster represents the units experience and results with the first 101 implantations with maximum follow up of 30 months. 100% follow-up. One revision at 3 months for failure to integrate, this was attributed to surgical error. Four asymptomatic subsidences all arrested by 6 months. No significant leg length discrepancies. Offset reproduced to less than 2mm in 85% of stems....

4. Lower risk of increasing CCD angle and reducing offset Title Authors Publication Reproduction of the anatomy (offset, CCD and leg length) with a modern short stem hip design - a radiological study Jerosch J, Grasselli C, Kothny PC, Litzkow D, Hennecke T Published in Deutscher Arzte-varlag, OUP, 2012 In this prospective radiological study, 250 consecutive hips with osteoarthritis were included, 129 females and 117 males. The patients were operated on by five different surgeons with MiniHip™. Different anatomic parameters of the hip were documented using pre-operative and post-operative...

5. Good survival rates and ability to recreate patient biomechanics Title Authors Publication Revision rates after short stem total hip arthroplasty – a systematic review of 49 clinical studies Van Oldenriik J, Molleman J, Klaver M, Poolman RW, Haverkamp D. Published in Acta orthopaedica 2014 This paper evaluated 49 studies involving 19 different stems and discussed the large number of studies on neck preserving stems, partial neck preserving stems and neck sacrificing stems. In 6,495 patients the different types of short stems showed various survival rates with neck preserving stems...

6. Suitability for treating avascular necrosis Title Authors Publication Is there an indication for a partial neck preserving short stem (MiniHip™) in patients with avascular necrosis of the femoral head? Jerosch J, Graselli C, Kothny C Published in Deutscher Arzte-varlag, OUP, 2014 In a prospective study design a total of 186 patients with a partial neck preserving stem (MiniHip™) were evaluated. There was a sub group of 18 patients who suffered from secondary osteoarthritis due to avascular necrosis (AVN). Oxford Hip Scores (OHS) and Hip dysfunction Osteoarthritis and Outcome Score (HOOS)...

7. DEXA results for MiniHip™ at 12 months Title Authors Publication Short stems promote positive bone remodelling: A DEXA study Ercan A, Filler TJ, Jerosch J Presented at ICJR Vienna 2015 62 patients aged 25-78 Yrs (34 women, 28 men) were implanted with MiniHip™ through an antrolateral approach. Periprosthetic bone mineral density (BMD) in each of the 7 gruen zones was measured with DEXA at 2 weeks, 3,6 and 12 months post op. The largest change was seen at 3 months with decease in zones 1,2,4 & 7. At 12 months compared to the 6 months results there is an increase in BMD in gruen zone 1...

8. Ability to restore femoral head centre in extreme cases of anteversion Title High anteversion in the Japanese population and the ability to restore femoral head centre Authors Lowry C, Traynor A, Kreuzer S, Collins S Publication Presented at ORS 2015 Methods 76 Japanese scans were analysed. Results of the CT data analysis indicated a tendency for higher anteversion associated with Japanese patients. Scans exhibiting the ninetieth percentile of version (extreme anteversion) were segmented using Materialise software and implanted with a contemporary long stem then with MiniHip™....

9. How MiniHip™ compares to Accolade in early outcomes Title Authors Publication Short stem hip replacement compared with conventional hip replacement; difference in early outcomes? Daivjna S, Agnello L, Bajwa A, Villar R Presented at ISTA , Kyoto Japan 2014 This study was a retrospective evaluation of 249 consecutive patients 125 received MiniHip™ and 124 an accolade stem. Mean follow up is 3.5years (1-7) average age was 66 (31-88) for the accolade patients and 54.4 (29-79) for the MiniHip™ patients. Evaluation was carried out on plain X-rays at 6 months, 1 year and 2 years...

Title Total hip arthroplasty by the direct anterior approach using a neck preserving prosthesis - a learning curve Authors Khemka A, Mograby O, Lord S, Doyle Z, Bosley B, Al Muderis M Publication Poster at ICJR World Arthroplasty congress Paris April 2015 150 cases implanted in a single surgeon series with MiniHip™ Trinity. The cohort was further sub divided into 2 groups, 75 patients in each based on recruitment order. OHS and SF36 were collected post op radiological review and operative evaluation. Improvement in OHS and SF36 of 26+29 points respectively Peri-prosthetic fracture...