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Orthopaedic Proceedings
Vol. 106-B, Issue SUPP_6 | Pages 57 - 57
2 May 2024
Martin A Alsousou J Chou D Costa M Carrothers A
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Current treatment options for displaced acetabular fractures in elderly patients include non-surgical management, surgical fixation and surgical fixation with simultaneous hip replacement, the so-called “fix-and-replace”™. There remains a paucity of evidence to guide surgeons in decision making for these difficult injuries. The aim of this study was to assess the feasibility of performing an appropriately powered RCT between treatment options for acetabular fractures in older patients.

This was an NIHR funded feasibility triple-arm RCT with participation from 7 NHS MTCs. Patients older than 60 were recruited if they had an acetabular fracture deemed sufficiently displaced for the treating surgeon to consider surgical fixation. Randomisation was performed on a 1:1:1 basis. The three treatment arms were non-surgical management, surgical fixation and fix-and-replace. Feasibility was assessed by willingness of patients to participate and clinicians to recruit, drop out rate, estimates of standard deviation to inform the sample size calculation for the full trial and completion rates to inform design of a future definitive trial. EQ-5D was the primary outcome measure at 6 months, OHS and Disability Rating Index were secondary outcome measures.

Of 117 eligible patients, 60 were randomised whilst 50 declined study participation. Nine patients did not receive their allocated intervention. Analysis was performed on an intention to treat basis. During the study period 4 patients withdrew before final review, 4 patients died and 1 was lost to follow-up. The estimated sample size for a full scale study was calculated to be 1474 participants for an EQ-5D MCID of 0.06 with a power of 0.8.

This feasibility study suggests a full scale trial would require international collaboration. This study also has provided observed safety data regarding mortality and morbidity for the fix-and-replace procedure to aid surgeons in the decision-making process when considering treatment options.


Bone & Joint Open
Vol. 5, Issue 1 | Pages 69 - 77
25 Jan 2024
Achten J Appelbe D Spoors L Peckham N Kandiyali R Mason J Ferguson D Wright J Wilson N Preston J Moscrop A Costa M Perry DC

Aims

The management of fractures of the medial epicondyle is one of the greatest controversies in paediatric fracture care, with uncertainty concerning the need for surgery. The British Society of Children’s Orthopaedic Surgery prioritized this as their most important research question in paediatric trauma. This is the protocol for a randomized controlled, multicentre, prospective superiority trial of operative fixation versus nonoperative treatment for displaced medial epicondyle fractures: the Surgery or Cast of the EpicoNdyle in Children’s Elbows (SCIENCE) trial.

Methods

Children aged seven to 15 years old inclusive, who have sustained a displaced fracture of the medial epicondyle, are eligible to take part. Baseline function using the Patient-Reported Outcomes Measurement Information System (PROMIS) upper limb score, pain measured using the Wong Baker FACES pain scale, and quality of life (QoL) assessed with the EuroQol five-dimension questionnaire for younger patients (EQ-5D-Y) will be collected. Each patient will be randomly allocated (1:1, stratified using a minimization algorithm by centre and initial elbow dislocation status (i.e. dislocated or not-dislocated at presentation to the emergency department)) to either a regimen of the operative fixation or non-surgical treatment.


Bone & Joint Open
Vol. 4, Issue 9 | Pages 676 - 681
5 Sep 2023
Tabu I Goh EL Appelbe D Parsons N Lekamwasam S Lee J Amphansap T Pandey D Costa M

Aims

The aim of this study was to describe the current pathways of care for patients with a fracture of the hip in five low- and middle-income countries (LMIC) in South Asia (Nepal and Sri Lanka) and Southeast Asia (Malaysia, Thailand, and the Philippines).

Methods

The World Health Organization Service Availability and Readiness Assessment tool was used to collect data on the care of hip fractures in Malaysia, Thailand, the Philippines, Sri Lanka, and Nepal. Respondents were asked to provide details about the current pathway of care for patients with hip fracture, including pre-hospital transport, time to admission, time to surgery, and time to weightbearing, along with healthcare professionals involved at different stages of care, information on discharge, and patient follow-up.


Bone & Joint Open
Vol. 3, Issue 11 | Pages 913 - 920
18 Nov 2022
Dean BJF Berridge A Berkowitz Y Little C Sheehan W Riley N Costa M Sellon E

Aims

The evidence demonstrating the superiority of early MRI has led to increased use of MRI in clinical pathways for acute wrist trauma. The aim of this study was to describe the radiological characteristics and the inter-observer reliability of a new MRI based classification system for scaphoid injuries in a consecutive series of patients.

Methods

We identified 80 consecutive patients with acute scaphoid injuries at one centre who had presented within four weeks of injury. The radiographs and MRI scans were assessed by four observers, two radiologists, and two hand surgeons, using both pre-existing classifications and a new MRI based classification tool, the Oxford Scaphoid MRI Assessment Rating Tool (OxSMART). The OxSMART was used to categorize scaphoid injuries into three grades: contusion (grade 1); unicortical fracture (grade 2); and complete bicortical fracture (grade 3).


Bone & Joint Open
Vol. 2, Issue 11 | Pages 909 - 920
10 Nov 2021
Smith T Clark L Khoury R Man M Hanson S Welsh A Clark A Hopewell S Pfeiffer K Logan P Crotty M Costa M Lamb SE

Aims

This study aims to assess the feasibility of conducting a pragmatic, multicentre randomized controlled trial (RCT) to test the clinical and cost-effectiveness of an informal caregiver training programme to support the recovery of people following hip fracture surgery.

Methods

This will be a mixed-methods feasibility RCT, recruiting 60 patients following hip fracture surgery and their informal caregivers. Patients will be randomized to usual NHS care, versus usual NHS care plus a caregiver-patient dyad training programme (HIP HELPER). This programme will comprise of three, one-hour, one-to-one training sessions for the patient and caregiver, delivered by a nurse, physiotherapist, or occupational therapist. Training will be delivered in the hospital setting pre-patient discharge. It will include practical skills for rehabilitation such as: transfers and walking; recovery goal setting and expectations; pacing and stress management techniques; and introduction to the HIP HELPER Caregiver Workbook, which provides information on recovery, exercises, worksheets, and goal-setting plans to facilitate a ‘good’ recovery. After discharge, patients and caregivers will be supported in delivering rehabilitation through three telephone coaching sessions. Data, collected at baseline and four months post-randomization, will include: screening logs, intervention logs, fidelity checklists, quality assurance monitoring visit data, and clinical outcomes assessing quality of life, physical, emotional, adverse events, and resource use outcomes. The acceptability of the study intervention and RCT design will be explored through qualitative methods with 20 participants (patients and informal caregivers) and 12 health professionals.


Bone & Joint Open
Vol. 2, Issue 7 | Pages 486 - 492
8 Jul 2021
Phelps EE Tutton E Costa M Hing C

Aims

To explore staff experiences of a multicentre pilot randomized controlled trial (RCT) comparing intramedullary nails and circular frame external fixation for segmental tibial fractures.

Methods

A purposeful sample of 19 staff (nine surgeons) involved in the study participated in an interview. Interviews explored participants’ experience and views of the study and the treatments. The interviews drew on phenomenology, were face-to-face or by telephone, and were analyzed using thematic analysis.


Bone & Joint Open
Vol. 2, Issue 1 | Pages 3 - 8
1 Jan 2021
Costa-Paz M Muscolo DL Ayerza MA Sanchez M Astoul Bonorino J Yacuzzi C Carbo L

Aims

Our purpose was to describe an unusual series of 21 patients with fungal osteomyelitis after an anterior cruciate ligament reconstruction (ACL-R).

Methods

We present a case-series of consecutive patients treated at our institution due to a severe fungal osteomyelitis after an arthroscopic ACL-R from November 2005 to March 2015. Patients were referred to our institution from different areas of our country. We evaluated the amount of bone resection required, type of final reconstructive procedure performed, and Musculoskeletal Tumor Society (MSTS) functional score.


Orthopaedic Proceedings
Vol. 98-B, Issue SUPP_15 | Pages 19 - 19
1 Sep 2016
Perry D Metcalfe D Costa M
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The aim was to examine the descriptive epidemiology of Slipped Capital Femoral Epiphysis, with respect to geography and time.

We extracted all children with a diagnosis of Slipped Capital Femoral Epiphysis from the Clinical Practice Research Database between 1990 and 2014 (24 years). CPRD is the world's largest database of primary care, which encompasses 8% of the UK population. CPRD was linked to Hospital Episode Statistics, and a validation algorithm applied to maximise sensitivity and specificity of the cases finding methodology. Poisson confidence intervals were calculated, and poison regression used.

596 cases of SCFE were identified. The internal validation algorithm supported a SCFE diagnosis in 88% cases. The age and sex distribution of cases mirrored that in the literature, offering external validity to the cases identified. There was no significant change in the incidence of SCFE over the 24-year study period, with the overall incidence being 4.8 cases per 100,00 0–16 year olds. There was no significant geographic variation in SCFE within the UK. There was a positive association with rising socioeconomic deprivation (p<0.01). There was no seasonal variation in presentation.

This study found no evidence to support the common belief that SCFE incidence is increasing, and for the first time demonstrated an association with socioeconomic deprivation. The results are important for considering the feasibility of intervention studies, and offer insights into the disease aetiology.


Orthopaedic Proceedings
Vol. 96-B, Issue SUPP_10 | Pages 6 - 6
1 Jul 2014
Fernandez M Makrides P McArthur J Venus M Young J Skillman J Wyse M Costa M
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We sought to evaluate the impact of a dedicated weekly ortho-plastics operating list on our ability to provide definitive soft tissue cover of open lower limb fractures within 72 hours.

We reviewed all open lower limb fractures at our centre before and after the introduction of an ortho-plastics list to determine whether definitive soft tissue coverage was achieved within 72 hours.

There were 23 open lower limb fractures at our centre in 2012 before the introduction of the ortho-plastics operating list of which only 7 (30%) had definitive soft tissue coverage within 72 hours. We hypothesised that the main reason for this was not patient or injury related factors but rather the logistical difficulties of coordinating theatre time on a routine trauma list with senior orthopaedic and plastic surgeon availability. To test this hypothesis we re-audited our time to soft tissue cover six months after the introduction of the ortho-plastics list and 70% of cases achieved coverage within 72 hours.

Achieving definitive soft tissue coverage of open lower limb fractures within 72 hours of injury is a challenge. A dedicated weekly ortho-plastics operating list significantly improves our ability to deliver this service.


Orthopaedic Proceedings
Vol. 95-B, Issue SUPP_12 | Pages 18 - 18
1 Mar 2013
Griffin X Chaudhry M Parsons N McArthur J Costa M
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Autologous bone graft has been used in the treatment of complex bone defects for more than a century. Morbidity associated with the harvest of this bone graft has led orthopaedic surgeons to seek alternative therapies in the treatment of long bone non-unions.

The aim of this study was to determine whether the use of demineralised bone matrix as a bone healing adjunct improves clinical outcomes in adult patients with long bone non-union. A systematic search was carried out of the peer-reviewed English language literature to identify all relevant studies. The search strategy returned a total of 47 studies. Five of these studies were relevant to the research question. The studies were critically assessed and where appropriate combined in a meta-analysis.

4 non-comparative studies and one comparative study were reviewed. An overall estimate of the rate of union for the five studies was 86% (95%CI: 71–94%). The one comparative study demonstrated the relative risk (RR) of healing was not significantly better than in patients treated with autologous bone graft; RR=1.03 (95%CI 0.96–1.12).

There are limited data to support the use of demineralised bone matrix in the treatment of long bone non-union. Demineralised bone matrix is likely to be similarly effective to other treatments in the management of non-union. This study confirms the clinical and ethical requirements to proceed with a randomised controlled trial to test the effectiveness of this intervention.


Orthopaedic Proceedings
Vol. 94-B, Issue SUPP_XXXVII | Pages 506 - 506
1 Sep 2012
Baxter J Emmett S Barlow T Costa M
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Introduction

The Patient Archiving and Communication System (PACS) has revolutionised the way that radiographs are stored and viewed in orthopaedic surgery. A recent advance has been the ability to upload images directly from the image intensifier to PACS. We postulated that this facility may reduce the need for post operative ‘check’ radiographs following many orthopaedic trauma procedures.

Patients and Method

We performed an audit of post-operative radiographs requested in our University Hospital over three time periods: 31 days immediately before the direct upload facility was introduced, 31 days immediately after and a 31 day period two months later. Details from the operating lists were cross-referenced with image intensifier records to identify cases where it had been used. PACS records were then checked to determine if these images were available to view and if a formal ‘check’ radiograph was performed in the period prior to discharge.


Orthopaedic Proceedings
Vol. 94-B, Issue SUPP_XXXVII | Pages 6 - 6
1 Sep 2012
Upadhyay P Beazley J Dunbar M Costa M
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Introduction

Locking compression plate (LCP) fixation is an established method of treatment of distal third tibial fractures. No biomechanical data exists in the literature regarding their use. Additionally no data exists on the biomechanical advantage of locking screw fixation over non-locking screw fixation for these fractures. In this study the axial and torsional stiffness, axial load to failure and fatigue performance of a 3.5 mm LCP medial distal tibia Synthes plate was evaluated for the stabilisation of distal third tibial fractures. Additionally the performance of the plate in uni and bicortical locked mode as well as non-locked mode was evaluated.

Methods

A standardized oblique fracture pattern was created in the tibial metaphysis of 3rd generation composite tibias, 40 mm from the distal end of the tibia (AO 43-A2.3). A 10mm fracture gap was used to model a comminuted metaphyseal fracture. A 3.5 mm medial distal tibia LCP was applied with bi or unicortical locking or bicortical non-locking screws to 5 tibias respectively. All the bio-mechanical tests were performed on a Bose 3510 Electroforce material testing machine.

A ramp to load, loading profile was used to determine the static axial and torsional performance of the construct. Fatigue testing simulated a 6 week gradual weight bearing régime with the load increasing every two weeks by 400N until either 250,000 cycles were completed or the construct failed.


Orthopaedic Proceedings
Vol. 94-B, Issue SUPP_IV | Pages 147 - 147
1 Mar 2012
Costa M Patel A Donell S
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Background

Shockwave therapy has been shown to induce osteoneogenesis in animal models. The mechanism of action is unclear, but experimental evidence suggests micro-fracture formation and increased blood flow as the most likely explanation. Several reports from Europe have suggested good results from the treatment of delayed fracture union with shock-waves. We present the results of a randomised double-blind placebo-controlled pilot study.

Method

Fourteen patients with clinically and radiologically confirmed delayed union of long-bones consented to enter the trial. The treatment group had a single application of 3000 high-energy shockwaves using the Stortz SLK unit with image intensifier control. The control group had the exactly the same treatment but with an ‘air-gap’ interposition to create a placebo-shockwave. Each patient was followed-up with serial radiographs as well as visual analogue pain scores and EuroQol assessments. All of the patients were reviewed for a minimum of three years post treatment.


Orthopaedic Proceedings
Vol. 94-B, Issue SUPP_IV | Pages 108 - 108
1 Mar 2012
White C Bil S Lacy M Costa M
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Fractures of the Proximal Femur are a common and disabling injury requiring hospital admission and surgical treatment leading to approximately 86,000 inpatient episodes annually in the UK, with such patients occupying more than 20% of NHS orthopaedic beds. Based on current trends the number of hip fractures may rise to 120,000 per annum by 2015.

As the age of the population increases, so does the prevalence of concomitant medical conditions. Atrial Fibrillation is rising in the general population. Recently, the benefit of treating these patients with warfarin to prevent stroke has been shown; as a consequence, the number of patients being treated with warfarin is on the increase.

We have performed a retrospective study of all patients admitted to our unit with Fractures of the neck of the femur between 2001 and 2006, from the Accident and Emergency department with a primary diagnosis of Proximal Femoral Fracture (1987 patients). 138 patients were on long term warfarin at the time of their admission (6.9% of admissions). 90.4% were being warfarinised for AF, 7.6% for DVT and the rest for other indications. Of these Patients only 12 (8.7%) received active reversal to their warfarin. (All received vitamin K either orally or Intravenously). The average delay to theatre attributable to warfarin therapy was 41.1 hours (p-0.001). Active reversal allowed this delay to be negated (p-0.01), and did not delay the reloading of warfarin post-operatively (p-0.012). It also allowed an average of 10.2 days earlier discharge from the orthopaedic unit (p-0.001).

This study shows that significant delays occur because of Warfarinisation of these patients and that active reversal seems to be beneficial in expediting surgical treatment and discharge from the orthopaedic unit.


Orthopaedic Proceedings
Vol. 94-B, Issue SUPP_IV | Pages 6 - 6
1 Mar 2012
Amarasekera H Roberts P Griffin D Krikler S Prakash U Foguet P Williams N Costa M
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We investigated the blood flow to the femoral head during and after Resurfacing Arthroplasty of the hip.

In a previous study, we recorded the intra-operative blood flow in 12 patients who had a posterior approach to the hip and 12 who had a trochanteric flip approach. Using a LASER Doppler flowmeter, we found a 40% drop in blood flow in the posterior group and an 11% drop in the trochanteric flip group (p<0.001). The aim of this current study was to find out whether the intra-operative fall in blood flow persists during the post-operative period.

We therefore conducted a Single Positron Emission Tomography (SPECT) scan on 14 of the same group of patients. The proximal femur was divided into four regions of interest. These were the mid-shaft, proximal shaft, inter-trochanteric and head-neck regions. The data was analysed for bone activity and comparisons made between the two groups for each region of the femur. We found that the bone activity in the mid-shaft, upper-shaft, and head-neck regions was the same eleven months after the surgery irrespective of the approach to the hip. However there was higher activity in the trochanteric flip group in the inter-trochanteric region.

We conclude that the intra-operative deficit in blood flow to the head-neck region of the hip associated with the posterior approach does not seem to persist in the late post-operative period. We believe the reason for increased bone activity in inter-trochanteric region to be due to the healing of the trochanteric flip osteotomy.


Orthopaedic Proceedings
Vol. 94-B, Issue SUPP_IX | Pages 72 - 72
1 Mar 2012
Hugill L Foguet P Costa M
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Purpose of the study

We report the problems associated with setting up an electronic arthroplasty surveillance plan and suggest some solutions which are appropriate to the modern NHS setting.

Methods and Results

In 2006, the lower limb arthroplasty surgeons at UHCW NHS Trust decided to set up a ‘virtual’ arthroplasty surveillance plan to provide long-term radiographic and patient reported clinical outcomes for all patients undergoing hip and knee arthroplasty. In the face of increasing pressure upon outpatient waiting time and funding issues, this system was designed to replace the routine clinical review of patients in the outpatient department.

While simple in principle, the virtual arthroplasty surveillance plan required input from surgeons and allied health professionals, hospital management, PCT clinicians, PCT finance, hospital finance, IT services and of course patients. However, in 2009 we were able to provide an electronic record of functional outcome scores and associated radiographs for over 1000 patients who had primary hip and knee arthroplasty surgery in our unit. Response rates for the first 6 months of 2009 for hip arthroplasty were 85.2% for functional outcomes and 84.2% for radiographic review. The subsequent clinical input is managed through ‘virtual’ clinics which provide a means to track patient outcomes and also an automated mechanism for financing the system. There are several areas which can still be improved, but early qualitative feedback suggests that this system provides high levels of satisfaction for both patients and surgeons.


Orthopaedic Proceedings
Vol. 94-B, Issue SUPP_II | Pages 100 - 100
1 Feb 2012
Costa M Chester R Shepstone L Robinson A Donell S
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The aim of this study was to compare immediate weight-bearing mobilisation with traditional plaster casting in the rehabilitation of non-operatively treated Achilles tendon ruptures.

Forty-eight patients with Achilles tendon rupture were randomised into two groups. The treatment group was fitted with an off-the-shelf carbon-fibre orthotic and the patients were mobilised with immediate full weight-bearing. The control group was immobilised in traditional serial equinus plaster casts. The heel raise within the orthotic and the equinus position of the cast was reduced over a period of eight weeks and then the orthotic or cast was removed. Each patient followed the same rehabilitation protocol. The primary outcome measure was return to the patient's normal activity level as defined by the patient.

There was no statistical difference between the groups in terms of return to normal work [p=0.37] and sporting activity [p=0.63]. Nor was there any difference in terms of return to normal walking and stair climbing. There was weak evidence for improved early function in the treatment group.

There was 1 re-rupture of the tendon in each group and a further failure of healing in the control group. One patient in the control group died from a fatal pulmonary embolism secondary to a DVT in the ipsilateral leg.

Immediate weight-bearing mobilisation provides practical and functional advantages to patients treated non-operatively after Achilles tendon rupture. However, this study provides only weak evidence of faster rehabilitation.


Orthopaedic Proceedings
Vol. 94-B, Issue SUPP_III | Pages 148 - 148
1 Feb 2012
Amarasekera H Costa M Prakash U Krikler S Foguet P Griffin D
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We used a laser Doppler flow-meter with high energy (20 m W) laser (Moor Instruments Ltd. Milwey, UK) to measure the blood flow to the femoral head during resurfacing arthroplasty.

Twenty-four hips were studied; 12 underwent a posterior approach and twelve a Ganz's trochanteric flip osteotomy. The approach was determined according to surgeon preference. Three patients were excluded, The exclusion criteria were previous hip surgery, history of hip fracture and avascular necrosis (AVN). All patients had the hybrid implant with cemented femoral component.

During surgery a 2.0mm drill bit was passed via the lateral femoral cortex to the superior part of the head neck junction. The position was confirmed using fluoroscopy. The measurements were taken during five stages of the operation: when the fascia lata was opened (baseline), at the end of soft tissue dissection, following dislocation of the hip, after relocation back into the socket, after inserting the implants prior to closing the soft tissues and, finally, at the end of soft tissue closure.

The results were analysed and the values were normalised to a percentage of the baseline value. We found a mean drop of 38.6 % in the blood flow during the posterior approach and a drop of 10.34% with the trochanteric flip approach. The significant drop occured between the baseline (1st stage) and the end of the soft-tissue dissection (2nd stage). In both groups the blood flow remained relatively constant afterwards.

Our study shows that there is a highly significant drop in blood flow (p<0.001) during the posterior approach compared with the trochanteric flip approach.


Orthopaedic Proceedings
Vol. 93-B, Issue SUPP_IV | Pages 546 - 546
1 Nov 2011
McArthur J Costa M Griffin D Krikler S Parsons N Pereira G Prakash U Rai S Foguet P
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Introduction: Pain and mass lesions around hip resurfacing are reported with increasing frequency. The aetiology is unknown but reaction to metal wear debris and mechanical impingement have both been suggested. We are aware of a group of our patients with significant pain following resurfacing. We sought to correlate metal ion levels with X-ray findings and any local soft tissue reaction around the prosthesis.

Methods: Patients with significant groin pain following hip resurfacing were identified from routine clinics. Blood was tested for cobalt and chromium levels using inductively coupled mass spectrometry in all patients. Cup abduction angle and femoral stem version were estimated from plain radiographs. Patients underwent ultrasound scan (USS) of the affected hip joint. Bilateral prostheses were excluded to avoid confounding.

Results: 47 unilateral painful hip resurfacings (24 female) were identified. USS was performed in 42 patients and was abnormal in 25 (15 female). Abnormalities ranged from simple joint effusion with or without synovial thickening, through to cystic masses in the posterior joint and solid masses related to the ileopsoas tendon similar to the appearances previously described in pseudotumours.

A two sample t-test demonstrated cobalt and chromium ion levels were significantly higher in patients with abnormalities on USS (p=0.038, p=0.05 respectively), patients with normal USS were more likely to have a retroverted femoral component (p=0.01).

Discussion: We describe two groups of patients with a painful hip resurfacing: those with raised metal ions and local soft tissue reaction, and those with lower metal ions and no soft tissue reaction. The retroverted stems in the second group could cause an iatrogenic cam-type impingement. Metal ion levels are useful to guide further imaging. Raised levels should prompt investigation for a soft tissue abnormality with either USS or MRI, lower levels suggest investigation should look for mechanical impingement with imaging such as CT.


Orthopaedic Proceedings
Vol. 93-B, Issue SUPP_I | Pages 70 - 70
1 Jan 2011
Ahmed U Rabbani N Costa M Watts R Thornalley P
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Background: Osteoarthritis (OA) is a progressive degenerative condition that causes pain and impairs the mobility of more than 10% of the UK population. Over 50,000 total knee replacements (TKR) are carried out each year for patients with the most severe symptoms. The aim of this study was to assess if markers of protein damage in the synovial fluid and plasma of patients with OA increase with severity of symptoms. These markers may then be of use in assessing disease presence and progression to assist with subsequent management. Proteins damaged by glycation (modified by sugars) and oxidation undergo cellular proteolysis. The proteolytic debris thereby formed - called glycation and oxidation free adducts (glycated and oxidised amino acids) - is released into the synovium and plasma for urinary excretion. In this study the concentrations of the glycation free adducts, Nε-carboxymethyl-lysine (CML) and methylglyoxal-derived hydroimidazolone (MG-H1), and the oxidation free adduct methionine sulfoxide (MetSO) were measured in the synovial fluid and plasma of patients with severe OA (sOA) and early-stage OA (eOA).

Methods: Patients were recruited from those attending the Rheumatology clinics at Ipswich Hospital, Ipswich and the Orthopaedic clinics at University Hospital, Coventry. Volunteer subjects were recruited to the normal healthy control group. The age (years; mean ± SD) for patient and control subject groups was: controls 45 ± 6 (n = 8), sOA 70 ± 12 (n = 8), eOA 50 ± 14 (n = 6). Patients found to have eOA changes (Outerbridge grade I/II) during routine arthroscopy were recruited to the eOA group. Synovial fluid and venous blood samples were taken with informed consent. All synovial fluid samples were taken from the knee joint. The concentrations of glycation and oxidation free adducts were assayed by stable isotopic dilution analysis liquid chromatography with tandem mass spectrometric detection (LC-MS/MS) in ultrafiltrate of synovial fluid and plasma. Significance of difference between study groups was assessed by ANOVA and Student’s t-test.

Results: The concentrations (nM; mean ± SD) of MetSO, CML and MG-H1 in synovial fluid were all markedly increased in OA patients with more severe disease. MetSO free adduct: eOA 459 ± 107 and sOA 2889 ± 1064 (p< 0.001). CML free adduct: eOA 77 ± 24 and 224 ± 51 (p< 0.001). MG-H1 free adduct: eOA 387 ± 182 and sOA 674 ±199 (p< 0.05). Analysis of plasma of these patients also showed increases in the concentrations of corresponding glycation and oxidation free adducts compared to those of normal healthy controls.

Discussion: The concentration of glycation and oxidation free adducts increased with severity of symptoms in the synovial fluid of patients with OA. This probably occurs by down regulation of protective gene expression in OA. Measurement of plasma protein glycation and oxidation free adducts may be useful in assessing progression and severity of OA. In the future, these markers may guide non-operative management and facilitate earlier joint-preserving surgery.