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Orthopaedic Proceedings
Vol. 106-B, Issue SUPP_17 | Pages 8 - 8
11 Oct 2024
Kennedy M Williamson T Kennedy J Macleod D Wheelwright B Marsh A Gill S
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Acetabular fractures present a challenge. Anatomical reduction can be achieved by open reduction and internal fixation (ORIF). However, in elderly patients with complex fracture patterns and osteoporotic bone stock, “fix and replace” has become an option in the management of these injuries. This involves ORIF of the acetabulum to enable insertion of a press fit cup and subsequent cemented femoral stem at the index surgery.

A Retrospective analysis of all operatively managed acetabular fractures by a regional Pelvic and Acetabular Trauma service (01/01/2018-30/05/2023) STATA used for analysis. 34 patients undergoing “fix and replace” surgery. Of the 133 patients managed with ORIF, 21 subsequently required Total Hip Arthroplasty (THA). Mean follow up was 2.7 years versus 5.1. There was no statistical significance between the two groups with regards to BMI or sex. Mean age in the “fix and replace” group was 68 compared to 48 in the ORIF and subsequent THA group. This reached statistical significance between the two groups (p=0.001).ASA and Charlson Comorbidity Index (3 and 3 in “fix and replace” and 2 and 1.2 in ORIF to THA group) and Charlson Comorbidity Index both were statistically significantly different (p=0.006 and p=0.027, respectively). High energy mechanism of injury accounted for 56% of the “fix and replace” group compared to 48% in the ORIF to THA. 74% of “fix and replace” were associated fractures compared to 53% of ORIF to THA. Wait to surgery was 3 days for “fix and replace” while 186 days was the mean wait time from listing to THA for the ORIF to THA group. Complication rate was 41% versus 43% in the two groups. 14% in the ORIF to THA group developed PJI versus 6% in “fix and replace”.

Fix and replace allows early mobilisation in frailer, elderly patients. Our results show fewer returns to theatre and less PJI in patients having arthroplasty as part of “fix and replace” than subsequent to Open reduction internal fixation.


Orthopaedic Proceedings
Vol. 103-B, Issue SUPP_12 | Pages 1 - 1
1 Oct 2021
Cherry J Downie S Harding T Gill S Johnson S
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Global surgical literature suggests that female trainees have less operative autonomy than their male counterparts. This pilot study had the primary objective to identify difference in autonomy by gender, and to power a national study to carry out further quantitative and qualitative research on this.

This was a retrospective, cross-sectional study utilising eLogbook data for all orthopaedic trainees (ST2-8) and consultants with CCT date 2016–2021 in a single Scottish deanery. The primary outcome measure was percentage of procedures undertaken as lead surgeon. 15 trainees and four recent consultants participated, of which 12 (63%) were male (mean grade 5.2), and 7 (37%) were female (mean grade 4.3). Trainees were lead surgeon on 64% of procedures (17595/27558), with autonomy rising with grade (37% ST1 to 85% ST8, OR 9.4). Operative autonomy was higher in male vs female trainees (66.5% and 61.4% respectively, p=<0.0001), with female trainees more likely to operate with a supervisor present (STU/S vs P/T, f 48%:13%, m 45%:20%).

This pilot study found that there was a significant difference in operative autonomy between male and female trainees, however this may be explained by differences in mean grade of male vs female trainees. Five trainees took time OOT, 4/5 of whom were female. Extension to a national multi-centre study should repeat the quantitative method of this study with additional qualitative analysis including assessing effect of time OOT to explore the reason for any gender discrepancies seen across different deaneries in the UK.


The Bone & Joint Journal
Vol. 100-B, Issue 12 | Pages 1618 - 1625
1 Dec 2018
Gill JR Kiliyanpilakkill B Parker MJ

Aims

This study describes and compares the operative management and outcomes in a consecutive case series of patients with dislocated hemiarthroplasties of the hip, and compares outcomes with those of patients not sustaining a dislocation.

Patients and Methods

Of 3326 consecutive patients treated with hemiarthroplasty for fractured neck of femur, 46 (1.4%) sustained dislocations. Of the 46 dislocations, there were 37 female patients (80.4%) and nine male patients (19.6%) with a mean age of 83.8 years (66 to 100). Operative intervention for each, and subsequent dislocations, were recorded. The following outcome measures were recorded: dislocation; mortality up to one-year post-injury; additional surgery; residential status; mobility; and pain score at one year.


Orthopaedic Proceedings
Vol. 99-B, Issue SUPP_18 | Pages 14 - 14
1 Nov 2017
Gill S Campbell D
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Training time in Trauma & Orthopaedics is pressured. In this action research project, we develop a feedback/self-reflection model for trainers and trainees, emphasising the contribution both groups make to training, to maximise cohesion and efficacy.

Starting in 2013, trainees completed anonymous feedback forms after each 6-month post. The 18-point quantitative questionnaire covers four training domains: WBA engagement, teaching/feedback, research/audit, operative training.

Consultant trainers completed a once-off corresponding 18-point self-reflection questionnaire. Additionally, trainers were asked for their expectations of and advice for trainees.

Individual trainer profiles were generated from trainee feedback questionnaires, allowing comparison between trainer-group-average, trainer-specific and trainer-self-reflection scores across 18 fields. Trainer profiles were uploaded to ISCP and used for recognition of trainer status for SOAR. This data provided basis for local service provision review with amendments to maximise training efficacy.

Results of thematic analysis of trainer feedback was shared with the trainee group. This and subsequent group self-reflection formed the basis of our ‘Trainee Charter’.

Trainee feedback illustrates high levels of satisfaction with local training (average global score 4.2/5). Strengths included ‘feedback’ and ‘operative teaching’; relative weaknesses included ‘research time’ and ‘OPD teaching’.

The ‘Trainee Charter’ details specific desirable behaviours that embody eight trainee-qualities consistently identified by trainers as important, including ‘honesty’ and ‘being organised’. The charter emphasises trainee contribution to training.

For the first time, trainers have the benefit of serial and individualised feedback. Trainees are better informed and empowered in relation to maximising their own training. Most importantly, both halves of the training-team are explicitly acknowledged.


Orthopaedic Proceedings
Vol. 96-B, Issue SUPP_3 | Pages 8 - 8
1 Feb 2014
Cousins G Rickhuss P Tinning C Gill S Johnson S
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Pain produced by the tourniquet is a common source of complaint for patients undergoing carpal tunnel decompression. Practice varies as to tourniquet position. There is little evidence to suggest benefit of one position over another. Our aim was to compare the experience of both the patient and the surgeon with the tourniquet placed either on the arm or the forearm.

Ethical approval was granted. Following power calculation and a significance level set at 0.05, 100 patients undergoing open carpal tunnel decompression under local anaesthetic were randomised to arm or forearm group. Visual Analogue Scores (VAS) (0–100) for pain, blood pressure and heart rate were taken at 2 minute intervals. The operating surgeon provided a VAS for bloodless field achieved and obstruction caused by the tourniquet.

The demographics of the groups was similar. There were no statistically significant differences in any measure between the groups.

Average tourniquet times were 8.8 minutes (forearm) and 8.2 minutes (arm). The average VAS score for forearm and arm was 13 and 11 respectively for bloodless field, 9 and 2 for obstruction. Average overall VAS for pain was 27 in each group, however interval VAS scores for pain were higher in the arm group. The average change Mean Arterial Pressure was −5 mmHg (forearm) −2 mmHg (arm) pulse rate was −1 bpm (forearm) and −2 bpm (arm).

Tourniquet placement on the arm does not result in significant difference in patient pain, physiological response or length of operation. Surgeons reported less obstruction and better bloodless fields with an arm tourniquet, however there was a trend for forearm tourniquet to result in less pain for the patient.


Orthopaedic Proceedings
Vol. 95-B, Issue SUPP_33 | Pages 2 - 2
1 Sep 2013
Gill SL Karabayas M Al-Khabori S Scicluna G Cochrane L Thomas S
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Involvement in research forms a mandatory part of Trauma & Orthopaedic specialty training. Evidence of publication is a compulsory criterion for attaining Certificate of Completion of Training (CCT). The publishing behaviour of orthopaedic trainees from all four deaneries in Scotland was examined (East, North, South East and West of Scotland).

A literature search was performed for Scottish orthopaedic trainees achieving CCT between July 2005–July 2010 using Knowledge Network and PubMed databases. Data collected included date of publication, article type, journal, publishing institute, number of authors and position of trainee within authors.

There was no significant difference in mean number of publications/trainee prior to specialty training across the four deaneries (EOS 0.18; NOS 0.18; SES 0.25; WOS 0.73). The number of publications/trainee during training was statistically significantly higher in SES (mean 6.31; mode 9; median 4) compared to WOS (2.23;0;1), NOS (2.18;1;2) and EOS (1.72;1;1). However, there was no correlation between a trainee's number of publications during training and post–CCT. There was no significant difference for mean number of authors/trainee publication during training across the four deaneries (range 3.38–3.63), nor mean position of trainee in list of authors (range 1.37–1.67).

This study highlights important differences and notable similarities in publishing behaviour during orthopaedic training across the Scottish deaneries. It suggests that rates of publication relate to factors during training and that publishing during training is not predictive of future behaviour. This research may be of interest to trainees, training committees and orthopaedic departments in future appointments.


Orthopaedic Proceedings
Vol. 95-B, Issue SUPP_10 | Pages 15 - 15
1 Feb 2013
Gill SL Hussain S MacLeod J Finlayson DF
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Revision hip surgery is reportedly rising inexorably yet not all units report this phenomenon. The outcome of 1143 consecutive Corin TaperFit primary hip arthroplasties (957 patients) performed between 1995 and 2010 is presented. The implants were cemented under pressurisation and combined the TaperFit stem with Ogee flanged cups.

Data was gathered from local arthroplasty database and case note review of revised joints. 13 hips have been revised (1.1%). Cumulative prosthesis survival is 0.99 +/− 0.0. Two femoral stems were revised (0.2%); one at 6 months for sepsis, one at 14 days after dislodgment during reduction of dislocation. No revisions were undertaken for aseptic loosening of the stem or cup, nor for thigh pain. 32 patients (32 hips) ≥15 year follow up, 13 survive today and none have been revised (0%). Of the 471 with ≥10 year follow up, 38 were aged ≤50 at time of surgery and 1/38 has been revised to date (PLAD for dislocation).

The strong population stability in this region, supported by independent investigation by Scottish Arthroplasty Project, endorses the accuracy of the data quoted. The low incidence of revision in this cohort, and absence of revision for aseptic loosening (mean follow up 8.03 years +/− SD 3.94; range 18 months to 16yrs 2 months), substantially supports the longevity and use of cemented, double-taper, polished, collarless femoral stems in combination with cemented polyethylene cups in primary hip arthroplasty in all patient age groups.


Orthopaedic Proceedings
Vol. 94-B, Issue SUPP_XXXVII | Pages 247 - 247
1 Sep 2012
Grammatopoulos G Pandit H Taylor A Whitwell D Glyn-Jones S Gundle R Mclardy-Smith P Gill H Murray D
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Introduction

Since the introduction of 3rd generation Metal-on-Metal-Hip-Resurfacing-Arthroplasty (MoMHRA), thousands of such prostheses have been implanted worldwide in younger patients with end-stage hip osteoarthritis. However, no independent centre has reported their medium-to-long term outcome. The aim of this study is to report the ten year survival and outcome of the Birmingham Hip Resurfacing (BHR), the most commonly used MoMHRA worldwide.

Methods

Since 1999, 648 BHRs were implanted in 555 patients, the majority of which were male (326). The mean age at surgery was 52.1years (range: 17–82), with primary OA as most common indication (85%). Mean follow up was 7.1years (range: 1–11). The Oxford Hip Score (OHS) and UCLA questionnaires were sent to all patients. Implant survival was established, with revision as the end point. Sub-analysis was performed by gender, femoral component size (small: <45mm, standard: 46–52, large: >53mm) and age at surgery (young:<50yrs, old:>50yrs).


Orthopaedic Proceedings
Vol. 94-B, Issue SUPP_XXXVII | Pages 579 - 579
1 Sep 2012
Grammatopoulos G Pandit H Backer K Gundle R Mclardy-Smith P Desmet K Murray D Gill H
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INTRODUCTION

Femoral neck narrowing (NN) following Metal-on-Metal Hip Resurfacing Arthroplasty (MoMHRA) is a well-recognised clinical phenomenon. The incidence of resurfaced hips with NN > 10% is reported to be up to 27%. Its pathogenesis is thought to be multi-factorial secondary to stress shielding, impingement, osteolysis secondary to wear/ion particles and as a result of reduced vascularity and pressure effect on cancellous bone secondary to the presence of a soft-tissue mass around the resurfaced hip. Recognised risk factors for its development include: female gender and the presence of a pseudotumour. Serum Chromium (Cr) and Cobalt (Co) are recognised surrogate markers of in-vivo wear of MoMHRA. The aims of this study were to establish whether NN is associated with increased wear.

METHODS

A cohort of 214 patients with unilateral MoMHRA (139M: 75F) was included in this study. Primary osteoarthritis was the diagnosis leading to surgery for the majority of patients (208). The average age at surgery was 54.1 years old (13–73). Six different implants were used; BHR (116), Conserve plus (92), Recap (2), ASR (2), Adept (1) and Cormet (1). The average femoral component size was 49.2mm (range: 38–59). The average follow up was 4.3 years (range: 2–10). Patients were subdivided into 3 groups as per implant size. Small size component group had implants <45mm, average size group had components 45–51mm and large component size group had components >51mm.

All patients had Prosthesis-Junction-Ratio (PJR) measured from postoperative (PJRpost) and at latest follow up (PJRfollow) radiographs. Measurements were made using the method described by Lilikakis1.

Metal ion levels (Cr/Co) were measured at last follow-up for all patients. Cr level >5.1g/ml and Co levels >4.4 g/ml were considered high2 and patients with such levels formed the high ion group.


Orthopaedic Proceedings
Vol. 94-B, Issue SUPP_XXXVII | Pages 263 - 263
1 Sep 2012
Monk A Grammatopoulos G Chen M Gibbons M Beard D Gill H Murray D
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Introduction

Osteoarthritis (OA) of the hip is an important cause of pain and morbidity. The mechanisms and pathogenesis of OA'sdevelopment remain unknown. Minor acetabular dysplasia and subtle variations in proximal femoral morphology are increasingly being recognized as factors that potentially compromise the joint biomechanically and lead to OA. Previous studies have shown that risk of hip OA increased as the femoral head to femoral neck ratio (HNR) decreased. Previous work has described the evolutionary change in inferior femoral neck trabecular density and geometry associated with upright stance, but no study has highlighted the evolutionary change in HNR. The aim of this study was to examine evolutionary evidence that the hominin bipedal stance has lead to alterations in HNR that would predispose humans to hip OA.

Methods

A collaboration with The Natural History Museums of London, Oxford and the Department of Zoology, University of Oxford provided specimens from the Devonian, Jurassic, Cretaceous, Miocene, Palaeolithic and Pleistocene periods to modern day. Specimens included amphibious reptiles, dinosaurs, shrews, tupaiae, lemurs, African ground apes, Lucy (A. Afarensis), H. Erectus, H. Neaderthalis and humans. Species were grouped according to gait pattern; HAKF (hip and knee flexed), Arboreal (ability to stand with hip and knee joints extended) and hominin/bi-pedal. Imaging of specimens was performed using a 64 slice CT scanner. Three-dimensional skeletal geometries were segmented using MIMICS software. Anatomical measurements from bony landmarks were performed to describe changes in HNR, in the coronal plane of the different specimens over time using custom software. Measurements of HNR from the specimens were compared with HNR measurements made from AP pelvic radiographs of 119 normal subjects and 210 patients with known hip OA listed for hip arthroplasty.


Orthopaedic Proceedings
Vol. 94-B, Issue SUPP_XXXVII | Pages 509 - 509
1 Sep 2012
Thomas G Hossain M Monk A Gill H Glyn-Jones S Andrew J Murray D Beard D Epos Group N
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Introduction

Malalignment of some designs of stem is associated with an increased risk of aseptic loosening and revision. We investigated whether the alignment of the cemented polished, double-taper design adversely affected outcome, in a multicentre prospective study.

Methods

A multicentre prospective study of 1189 total hip replacements was undertaken to investigate whether there is an association between surgical outcome and femoral stem alignment. All patients underwent a primary THR with the Exeter femoral stem (Stryker Howmedica Osteonics, Mahwah, NJ) and a variety of acetabular components. The primary outcome measure was the Oxford hip score (OHS) and change in OHS at five years. Secondary outcomes included rate of dislocation and revision. Radiographic evaluation of the femoral component was also undertaken. The long axis of the Exeter femoral component and the long axis of the femoral canal were located, and the angle at the point of intersection measured. The cementing quality was determined as defined by Barrack et al. Radiolucent lines at the cement-stem and cement-bone interface in the five year radiographs were defined using the zones described by Gruen et al. Subsidence was measured as the vertical dimension of the radiolucency craniolateral to the shoulder of the stem in Gruen zone 1 as described by Fowler et al. Cement fractures were recorded.


Orthopaedic Proceedings
Vol. 94-B, Issue SUPP_XXXVII | Pages 422 - 422
1 Sep 2012
Weston-Simons J Pandit H Kendrick B Beard D Gibbons M Jackson W Gill H Price A Dodd C Murray D
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Introduction

The options for the treatment of the young active patient with unicompartmental symptomatic osteoarthritis and pre-existing Anterior Cruciate Ligament (ACL) deficiency are limited. Patients with ACL deficiency and end-stage medial compartment osteoarthritis are usually young and active. The Oxford Unicompartmental Knee Replacement (UKA) is a well established treatment option in the management of symptomatic end-stage medial compartmental osteoarthritis, but a functionally intact ACL is a pre-requisite for its satisfactory outcome. If absent, high failure rates have been reported, primarily due to tibial loosening. Previously, we have reported results on a consecutive series of 15 such patients in whom the ACL was reconstructed and patients underwent a staged or simultaneous UKA. The aim of the current study is to provide an update on the clinical and radiological outcomes of a large, consecutive cohort of patients with ACL reconstruction and UKA for the treatment of end-stage medial compartment osteoarthritis and to evaluate, particularly, the outcome of those patients under 50.

Methods

This study presents a consecutive series of 52 patients with ACL reconstruction and Oxford UKA performed over the past 10 years (mean follow-up 3.4 years). The mean age was 51 years (range: 36–67). Procedures were either carried out as Simultaneous (n=34) or Staged (n=18). Changes in clinical outcomes were measured using the Oxford Knee Score (OKS), the change in OKS (OKS=Post-op − Pre-op) and the American Knee Society Score (AKSS). Fluoroscopy assisted radiographs were taken at each review to assess for evidence of loosening, radiolucency progression, (if present), and component subsidence.


Orthopaedic Proceedings
Vol. 94-B, Issue SUPP_XXXVII | Pages 456 - 456
1 Sep 2012
Grammatopoulos G Pandit H Mellon S Glyn-Jones S Gundle R Mclardy-Smith P Murray D Gill H
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INTRODUCTION

Studies have suggested that there is a reduction in head-neck-ratio (HNR) associated with MoMHRA. A reduction in HNR at operation would decrease range of movement and increase impingement risk. Impingement could lead to 20 edge loading, increasing wear. Serum ion levels of Chromium (Cr) and Cobalt (Co) are surrogate markers of wear. Although acetabular component orientation has been shown to contribute to wear and PT development, the role of a decrease in HNR has only been highlighted in PT development. This study aimed to measure changes in HNR that occur at resurfacing and determine any gender- and component size-specific differences. In addition it aimed to determine whether changes in HNR could be associated with increased wear.

METHODS

84 patients (56M: 28F) with unilateral MoMHRA were included. The mean age at surgery was 57 years. The mean femoral component was 49mm. Components were considered small if <45mm, average if between 45–50mm and large if >50mm. Three designs were implanted; BHR, C+ and Recap. The average follow up was 4 years. All patients had Cr/Co levels measured at follow up. Patients were considered to have high ions if Cr and Co levels were 5.1ppb and 4.4ppb respectively.

Pre-operative HNR (HNRpre) and the post-operative HNR (HNRpost) were made from the respective pelvic radiographs. Assuming a 2mm thick cartilage layer, the HNR based on the diameter of the articular cartilage pre-operatively (HNRart) was calculated.

The immediate changes in HNR as a result of the operation were expressed relative to articular HNR pre-op:

HNRartpost=HNRpost–HNRart


Orthopaedic Proceedings
Vol. 94-B, Issue SUPP_XXXVII | Pages 249 - 249
1 Sep 2012
Kendrick B Weston-Simons J Sim F Gibbons M Pandit H Gill H Price A Dodd C Murray D
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Introduction

Radiolucencies beneath the tibial component are well recognized in knee arthroplasty; the aetiology and significance are poorly understood. Non-progressive narrow radiolucencies with a sclerotic margin are thought not to be indicative of loosening. Factors which decrease the incidence of radiolucencies include cementless fixation and the use of pulse lavage. Leg/component alignment or BMI do not influence radiolucency. We are not aware of any studies that have looked at the effect of load type on radiolucency.

The Oxford domed lateral tibial component was introduced to decrease the bearing dislocation rate that was unacceptably high with the flat tibial tray. However, the introduction of the domed tibial component alters the forces transmitted through the implant-cement-bone interface. As the Oxford UKR uses a fully congruent mobile bearing, the forces transmitted through the interface with a flat tray are compressive, except for the effect of friction. However, with the domed tibial component shear forces are introduced. The aim of this study was to assess the prevalence of radiolucency beneath the previous flat design and the new domed tibial tray.

Patients and methods

A consecutive series of 248 cemented lateral UKRs (1999–2009) at a single institution were assessed. The first 55 were with a flat tibia and the subsequent 193 with a domed component. One year post-op radiographs were assessed, by two observers, for the presence (full or partial) and distribution of radiolucency. The distribution and thickness of each radiolucency. Cases were excluded for missing or poorly aligned radiographs.


Orthopaedic Proceedings
Vol. 94-B, Issue SUPP_XXXVII | Pages 578 - 578
1 Sep 2012
Grammatopoulos G Judge A Pandit H Mclardy-Smith P Glyn-Jones S Desmet K Murray D Gill H
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INTRODUCTION

Although simulation studies have shown superior wear properties of metal-on-metal articulations, increased concern exists regarding the excess in-vivo wear of a small number of Metal-on-Metal-Hip-Resurfacing (MoMHRA) implants. Serum ion levels of Chromium (Cr) and Cobalt (Co) are surrogate markers of wear. Risk factors associated with increased wear include female gender, small components, dysplasia, cup orientation outside safe zone and femoral head downsize during surgery with an associated decrease in Head-Neck-Ratio (HNR). However, these factors are interlinked. This study aims to identify the factors that are most important for subsequent wear of MoMHRA, by performing a multivariate analysis.

METHODS

206 patients (124M: 82F) with unilateral MoMHRA were included in this study. The average follow up was 3.3 years. All patients had Cr/Co levels measured at follow up. Inclination and anteversion of each cup were measured using EBRA. Cups were analysed as being within or outside the previously defined optimum-zone. HNR measurements were made from pre-operative (HNRpre) and post-operative (HNRpost) radiographs. The immediate changes in HNR (downsize/upsize of femoral head) as a result of the operation were expressed as:

HNRprepost=HNRpost–HNRpre

Multivariate linear regression modelling was used to explore the association between measures of ions with the following predictor variables (gender, age, diagnosis, femoral component size, orientation of the acetabular component, head/neck ratio and position of femoral stem). Analyses were carried out separately for each outcome (Cr and Co). Classification and Regression Tree (CART) models were fitted as a complimentary approach to regression modelling.


Orthopaedic Proceedings
Vol. 94-B, Issue SUPP_XXXVII | Pages 584 - 584
1 Sep 2012
Grammatopoulos G Thomas G Pandit H Glyn-Jones S Gill H Beard D Murray D
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INTRODUCTION

The introduction of hard-on-hard bearings and the consequences of increased wear due to edge-loading have renewed interest in the importance of acetabular component orientation for implant survival and functional outcome following hip arthroplasty. Some studies have shown increased dislocation risk when the cup is mal-oriented which has led to the identification of a safe-zone1. The aims of this prospective, multi-centered study of primary total hip arthroplasty (THA) were to: 1. Identify factors that influence cup orientation and 2. Describe the effect of cup orientation on clinical outcome.

METHODS

In a prospective study involving seven UK centers, patients undergoing primary THA between January 1999 and January 2002 were recruited. All patients underwent detailed assessment pre-operatively as well as post-op. Assessment included data on patient demographics, clinical outcome, complications and further surgery/revision. 681 primary THAs had adequate radiographs for inclusion. 590 hips received cemented cups. The primary functional outcome measure of the study was the change between pre-operative and at latest follow up OHS (OHS). Secondary outcome measures included dislocation rate and revision surgery. EBRA was used to determine acetabular inclination and version.

The influence of patient's gender, BMI, surgeon's grade and approach on cup orientation was examined. Four different zones tested as possibly ± (Lewinnek Zone, Callanan's described zone and zones ± 5 and ±10 about the study's mean inclination and anteversion) for a reduced dislocation risk and an optimal functional outcome.