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Orthopaedic Proceedings
Vol. 106-B, Issue SUPP_11 | Pages 22 - 22
4 Jun 2024
Woods A Henari S Kendal A Rogers M Brown R Sharp R Loizou CL
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Background

Open or arthroscopic ankle fusion (AAF) is a successful operative treatment for end-stage ankle arthritis. Evidence suggest that AAFs have better outcomes. In addition to the operative technique other patient-factors can influence outcomes. The most significant complication of ankle fusion is a non-union. To better understand the risk factors related to this we undertook a retrospective investigation of primary AAFs.

Methods

We reviewed all AAFs conducted at our institution over a 10-year period. Patients excluded if they had simultaneous fusion of neighbouring joints or were lost to follow-up. The primary outcome variable was radiographic union. Other operative complications were analysed as secondary outcomes. Two hundred and eighty-four eligible AAFs in 271 patients were performed over the study period.


Orthopaedic Proceedings
Vol. 106-B, Issue SUPP_9 | Pages 11 - 11
16 May 2024
Kendal A Brown R Loizou C Rogers M Sharp R Carr A
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Tendinopathy can commonly occur around the foot and ankle resulting in isolated rupture, debilitating pain and degenerative foot deformity. The pathophysiology and key cells involved are not fully understood. This is partly because the dense collagen matrix that surrounds relatively few resident cells limits the ability of previous techniques to identify and target those cells of interest. In this study, we apply novel single cell RNA sequencing (CITE-Seq) techniques to healthy and tendinopathic foot/ankle tendons. For the first time we have identified multiple sub-populations of cells in human tendons. These findings challenge the view that there is a single principal tendon cell type and open new avenues for further study. Healthy tendon samples were obtained from patients undergoing tendon transfer procedures; including tibialis posterior and FHL. Diseased tendon samples were obtained during debridement of intractable Achilles and peroneal tendinopathy, and during fusion of degenerative joints. Single cell RNA sequencing with surface proteomic analysis identified 10 sub-populations of human tendon derived cells. These included groups expressing genes associated with fibro-adipogenic progenitors (FAPs) as well as ITGA7+VCAM1- recently described in mouse muscle but, as yet, not human tendon. In addition we have identified previously unrecognised sub-classes of collagen type 1 associated tendon cells. Each sub-class expresses a different set of extra-cellular matrix genes suggesting they each play a unique role in maintaining the structural integrity of normal tendon. Diseased tendon harboured a greater proportion of macrophages and cytotoxic lymphocytes than healthy tendon. This inflammatory response is potentially driven by resident tendon fibroblasts which show increased expression of pro-inflammatory cytokines. Finally, identification of a previously unknown sub-population of cells found predominantly in tendinopathic tissue offers new insight into the underlying pathophysiology. Further work aims to identify novel proteins targets for possible therapeutic pathways.


Orthopaedic Proceedings
Vol. 106-B, Issue SUPP_8 | Pages 8 - 8
10 May 2024
Sim K Schluter D Sharp R
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Introduction

Acetabular component loosening with associated bone loss is a challenge in revision hip arthroplasty. Trabecular Metal (TM) by Zimmer Biomet has been shown to have greater implant survivorship for all-cause acetabular revision in small cohort retrospective studies. Our study aims to review outcomes of acetabular TM implants locally.

Method

This is a retrospective observational study using data from Auckland City and North Shore Hospitals from 1st of January 2010 to 31st of December 2020. Primary outcome is implant survivorship (re-revision acetabular surgery for any cause) demonstrated using Kaplan-Meier analysis. Secondary outcome is indication for index revision and re-revision surgery. Multivariate analysis used to identify statistically significant factors for re-revision surgery.


Orthopaedic Proceedings
Vol. 105-B, Issue SUPP_3 | Pages 18 - 18
23 Feb 2023
Grant M Zeng N Lin M Farrington W Walker M Bayan A Elliot R Van Rooyen R Sharp R Young S
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Joint registries suggest a downward trend in the use of uncemented Total Knee Replacements (TKR) since 2003, largely related to reports of early failures of uncemented tibial and patella components. Advancements in uncemented design such as trabecular metal may improve outcomes, but there is a scarcity of high-quality data from randomised trials.

319 patients <75 years of age were randomised to either cemented or uncemented TKR implanted using computer navigation. Patellae were resurfaced in all patients. Patient outcome scores, re-operations and radiographic analysis of radiolucent lines were compared.

Two year follow up was available for 287 patients (144 cemented vs 143 uncemented). There was no difference in operative time between groups, 73.7 v 71.1 mins (p= 0.08). There were no statistical differences in outcome scores at 2 years, Oxford knee score 42.5 vs 41.8 (p=0.35), International Knee Society 84.6 vs 84.0 (p=0.76), Forgotten Joint Score 66.7 vs 66.4 (p=0.91). There were two revisions, both for infection one in each group (0.33%). 13 cemented and 8 uncemented knees underwent re-operation, the majority of these being manipulation under anaesthetic (85.7%), with no difference (8.3% vs 5.3%, 95% CI -2.81% to 8.89%, p = 0.31). No difference was found in radiographic analysis at 2 years, 1 lucent line was seen in the cemented group and 3 in the uncemented group (0.67% v 2.09%, 95%CI -4.1% to 1.24%, p = 0.29).

We found no difference in clinical or radiographic outcomes between cemented and uncemented TKR including routine patella resurfacing at two years.

Early results suggest there is no difference between cemented and uncemented TKR at 2 years with reference to survivorship, patient outcomes and radiological parameters.


Orthopaedic Proceedings
Vol. 96-B, Issue SUPP_17 | Pages 29 - 29
1 Nov 2014
Kendal A Cooke P Sharp R
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Background:

Avascular necrosis (AVN) of the talus is a painful condition caused by trauma, steroids, alcoholism and haematological disorders. It is difficult to treat and at present there is insufficient evidence in favour of any particular strategy. The aim of operative therapy should be to relieve symptoms, maintain the normal architecture of the talus and treat associated arthritis. Small case series have described early core decompression, retrograde tibiotalocalcaneal arthrodesies and open tibio-calcaneal arthrodesis. Open procedures risk further talar collapse by disrupting its blood supply, and tibiotalocalcanal fusion sacrifices both the ankle and subtalar joints. The hypothesis is that arthroscopic ankle fusion relieves symptoms of AVN talus while preserving the subtalar joint and preventing further collapse.

Methods:

A case study was performed of 16 patients with AVN who underwent arthroscopic ankle fusion at the Nuffield Orthopaedic Centre, Oxford, UK between 1998 and 2012. Clinical notes, radiographs and MRI was used to investigate the cause, co-morbidities and treatment outcomes following arthroscopic ankle fusion. Our primary outcome was fusion rate. Secondary outcomes included peri-operative complications, ongoing pain and subsequent operative intervention.


Orthopaedic Proceedings
Vol. 96-B, Issue SUPP_17 | Pages 32 - 32
1 Nov 2014
Ball T Readman H Kendal A Rogers M Sharp R Lavis G Cooke P
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Introduction:

Vitamin D plays an important role in bone turnover. Deficiency (including borderline deficiency, or insufficiency) has a known association with fractures and has been linked to delayed or nonunion of fractures. We therefore routinely test vitamin D in cases of nonunion. Noting a high rate of vitamin D deficiency in this group, we instituted a policy to routinely screen for and treat vitamin D deficiency in both post-operative and pre-operative patients. We hypothesised that, in the post-operative patients, levels would correlate with rates of union.

Methods:

We sent serum vitamin D levels on consecutive post-operative patients seen in clinics between January and May 2014. They included those with an arthrodesis of the ankle, triple joint or first MTPJ. Union was deemed to have occurred when the patient was comfortable full weight bearing and radiographs showed trabeculae crossing the fusion site. Nonunions were all confirmed with computed tomography.


Orthopaedic Proceedings
Vol. 96-B, Issue SUPP_17 | Pages 23 - 23
1 Nov 2014
Kendal A Ball T Rogers M Cooke P Sharp R
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Background:

Calcaneal osteotomy is an established technique in correcting hind foot deformity. Patients have traditionally received an open osteotomy through Atkins lateral approach. In order to reduce the rate of wound complications associated with the Atkins approach, a minimally invasive surgical (MIS) technique has been adopted since 2011. This uses a low-speed, high-torque burr to perform the same osteotomy under radiographic guidance. The results of the new MIS technique, including post-operative complication rates, are compared to the standard open approach.

Methods:

The safety of the new MIS technique was investigated by conducting a case controlled study on all patients who underwent displacement calcaneal osteotomy at the Nuffield Orthopaedic Centre, Oxford from 2008 to 2014. The primary outcome measure was 30 day post-operative complication rate. Secondary outcome measures included operating time, duration of stay, fusion rates and amount of displacement achieved.


Orthopaedic Proceedings
Vol. 96-B, Issue SUPP_2 | Pages 39 - 39
1 Jan 2014
Reading J Portelli M Rogers M Sharp R Cooke P
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Introduction:

TTC fusion for the salvage of failed TARs with significant bone loss using a hindfoot nail and femoral head allograft has been reported in a number of small series. We present our experience of this procedure.

Method:

Review of the theatre records from 2006 to July 2011 identified twenty four cases using this technique. The case notes and imaging were retrospectively reviewed.


Orthopaedic Proceedings
Vol. 95-B, Issue SUPP_21 | Pages 18 - 18
1 Apr 2013
Dawson J Rogers M Lavis G Sharp R Cooke P
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Background

Evaluation of outcomes and satisfaction following hallux valgus (HV) surgery is usually retrospective and rarely uses patient-reported outcome measures (PROMs).

Design

Prospective Cohort Study. Postal evaluation survey of patients who had provided pre-operative PROMs data.


Orthopaedic Proceedings
Vol. 95-B, Issue SUPP_21 | Pages 26 - 26
1 Apr 2013
Ahluwalia R Cooke P Rogers M Sharp R
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Introduction

Ankle replacement is now common in the UK.

In a tertiary referral NHS practice, between 1997–2011 we implanted two types of cementless mobile bearing total ankle replacements (TAR).

Methods

We reviewed our operative database and electronic patient records and confirmed the number of prosthesis with our theatre records. All case notes and radiographs were reviewed. Failure was taken as revision, and patients were censored due to death or loss to follow-up. The survivorship was calculated using a life table (the Kaplan-Meier method), with 95% confidence intervals.


Bone & Joint Research
Vol. 2, Issue 4 | Pages 66 - 69
1 Apr 2013
Morley D Jenkinson C Doll H Lavis G Sharp R Cooke P Dawson J

Objectives

The Manchester–Oxford Foot Questionnaire (MOXFQ) is a validated 16-item, patient-reported outcome measure for evaluating outcomes of foot or ankle surgery. The original development of the instrument identified three domains. This present study examined whether the three domains could legitimately be summed to provide a single summary index score.

Methods

The MOXFQ and Short-Form (SF)-36 were administered to 671 patients before surgery of the foot or ankle. Data from the three domains of the MOXFQ (pain, walking/standing and social interaction) were subjected to higher order factor analysis. Reliability and validity of the summary index score was assessed.


Orthopaedic Proceedings
Vol. 94-B, Issue SUPP_XLIII | Pages 51 - 51
1 Sep 2012
Rogers M Ghassemi A Sharp R Cooke P
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Introduction

In 1927, Lambrinudi described a variant triple fusion for the treatment of paralytic “drop foot”. This involved closing wedge osteotomies and fusion to correct the deformities predominantly caused by Polio. The eradication of Polio has seen a shift in its use to the correction of other complex hind foot deformities. The technique has relevance in modern Orthopaedics for other neurological and degenerate conditions. There have been few published series of this technique since 1927.

We describe a series of 14 complex corrective triple arthrodeses to illustrate the power of Lambrinudi's concepts. We believe Lambrinudi's original description has relevance in terms of modern day complex hindfoot deformity correction.


Orthopaedic Proceedings
Vol. 94-B, Issue SUPP_XXII | Pages 32 - 32
1 May 2012
Wansbrough G Sharp R Cooke P
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Juvenile Chronic Arthritis results in the early degeneration of multiple joints with severe pain and deformity. Treatment of ankle arthritis is complex and ankle replacement is indicated because of adjacent and distant joint involvement.

Materials and Methods

We reviewed 25 total ankle replacements in 13 young adults suffering the generalised consequences of Juvenile Chronic Arthritis (JCA) between 2000 and 2009. 12 had bilateral disease, 20 had anklylosis or prior fusion of the hind- or midfoot, and 16 had substantial fixed inversion of the hindfoot. All had previous prosthetic arthroplasty of between 1 and 15 joints. Surgery comprised corrective triple fusion where required, with staged total ankle arthroplasty at an interval of 3 or more months.

Results

All patients reported significant reduction in pain, and increased mobility with increased stride length, however severe co-morbidity limited the usefulness of routine outcome scores. No ankles have required revision to date.

We noted that the dimensions of the distal tibia and talus are markedly reduced in patients with JCA, and as a result of this and bone fragility, the malleoli were vulnerable to fracture or resection. JCA is also associated with cervical spondilitis and instability, micrognathia, temporomandibula arthritis and crico-arytenoid arthritis, resulting in challenging anaesthesia.


Orthopaedic Proceedings
Vol. 94-B, Issue SUPP_XV | Pages 12 - 12
1 Apr 2012
Ward N Lasrado I Walker N Sharp R Phillip R Cooke P
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Changes in armour reinforcement of military vehicles have resulted in a changed injury pattern. Injuries which would previously have resulted in amputation are now less severe, and after initial debridement and temporary fixation the foot can now be saved. New patterns of injuries are emerging often as a part of potentially survivable poly-trauma. We describe a small series of these injuries. The techniques and results of late reconstruction are presented. We also discuss specific problems of managing patients with potential contamination with unusual organisms.


Orthopaedic Proceedings
Vol. 94-B, Issue SUPP_III | Pages 133 - 133
1 Feb 2012
Nagarajah K Aslam N Stubbs D Sharp R McNally M
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Introduction

Ankle fusion presents a difficult problem in the presence of infection, inadequate soft tissue, poor bone stock and deformity. Nonunion and infection remains a problem even with internal fixation. Ilizarov frame provides an elegant solution to the problem with stable remote fixation while allowing lengthening, deformity correction and weight bearing.

Patients and methods

Twenty-one consecutive patients were studied. The mean age at onset of disease was 52 years (range 4-70). Mean duration of the problem was 59.9 months (6-372). Aetiology included traumatic arthritis in 5, traumatic arthritis with osteomyelitis in 1, failed ankle fusion in 8, septic arthritis in 1, infected ankle fracture nonunion in 1, avascular necrosis of talus in 1, congenital deformity in 3 and failed ankle arthroplasty in 1. 15 patients had deformity of the ankle at the time of presentation. 15 of the 21 patients had either clinical or radiological evidence of infection. Treatment principles involved local excision, deformity correction with good alignment and soft tissue management. Static Compression was achieved with an Ilizarov frame while dynamic fixation was performed in 3 cases for lengthening. Antibiotics treatment was continued until union in the infected cases. On achieving union the frame was removed and a below knee cast was applied for 4 weeks.


Orthopaedic Proceedings
Vol. 93-B, Issue SUPP_IV | Pages 478 - 478
1 Nov 2011
Butler M Dheerendra S Goddard N Goldberg A Sharp R Ward N Cooke P
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Introduction: Severe haemophilia affects 1 in 10,000 men. The ankle along with the hip and knee are commonly affected. Ankle fusion is the preferred surgery for end stage arthritis in the younger patient although debate exists as to the preferred technique. We conducted a retrospective review of the arthroscopic ankle fusions on haemophiliacs from Oxford and compared data with that of a specialist unit in London using an open technique.

Materials and Methods: We reviewed 22 ankles (22 patients) from Oxford and 10 ankles (8 patients) from London. 90% had Type A haemophilia with similar regular monthly Factor VIII usage: 17941 U/month (Oxford) compared with 17992 (London). 73% of patients in the Oxford Group and 100% of the London group had Hepatitis C and/or HIV.

Results: Union was achieved in all patients. The mean time to union in the open group was 9.1 weeks (Mode- 8 weeks, Range 7–14) compared to 12.2 weeks (Mode- 12 weeks, Range 8–24) in the arthroscopic group. Screw removal was required in 4 patients (3 arthroscopic v’s 1 open). 1 patient in the arthroscopic group suffered a pseudoaneurysm of the dorsalis pedis artery. The arthroscopic group spent less time in hospital- 5.7 days compared to 9.5. Factor VIII usage was less in the arthroscopic group- 32,882 Units compared to 40013.

Discussion: Patients of this nature should be managed in centres used to dealing with their complex needs. Arthroscopic ankle fusion in haemophiliacs is safe for these patients. Although arthroscopic fusion may take slightly longer to unite, there are benefits in terms of reduced patient stay and factor VIII requirement and therefore costs.


Orthopaedic Proceedings
Vol. 93-B, Issue SUPP_III | Pages 380 - 380
1 Jul 2011
Johnston A Senior C Sharp R Farrington B
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Acetabular bone loss is a problem in primary and revision Total Hip Joint Replacement (THJR). Impaction bone grafting is one method of dealing with this problem. We looked at the results of two surgeons who use this method at North Shore Hospital, Auckland.

A retrospective study was carried out on all patients who had acetabular impaction bone grafting carried out as part of THJR, whether primary or revision. All operations were performed by two surgeons, Mr Rob Sharp and Mr Bill Farrington. Patients were assessed in clinic at varying time intervals post grafting, and were functionally scored.

33 patients underwent impaction grafting, a total of 35 acetabular grafts. Of these the male to female ratio was 16:17, and the mean age range was 46–82 years. Average Harris hip score was 79 (Min 54 Max 95), and the average Oxford score was 39 (min 13 Max 48). There was one failure, 3 dislocations, and1 sciatic nerve palsy.

Impaction bone grafting is one method, which can be utilised to reconstruct acetabular bone loss, with the additional advantage of restoring bone stock. We found high rates of patient satisfaction, and a low failure rate.


Orthopaedic Proceedings
Vol. 93-B, Issue SUPP_I | Pages 53 - 53
1 Jan 2011
Ward N Ladher S Sharp R
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According to the National Institute of Clinical Excellence (NICE) Guidelines, some foot and ankle patients are, by definition, at high risk of DVT/PE. Despite NICE guidance, DVT recommendations are still controversial, and are being reviewed by the BOA to be more operation and context specific.

One consultant at our institution therefore initiated a 6 week medical DVT prophylaxis regimen for all his post-operative hind–foot surgery patients who were placed in plaster. From January 2007 to February 2008 we audited 97 hind-foot patients to measure their compliance rate, complications and DVT/PE rate.

Compliance was excellent (97%) particularly with regard to Low Molecular Weight Heparin (LMWH), but only 70% had medication prescribed for the 6 weeks, and 3% developed a DVT.

Self administered LMWH is acceptable and compliance is excellent in post operative orthopaedic patients, but not necessarily effective.


Orthopaedic Proceedings
Vol. 92-B, Issue SUPP_I | Pages 240 - 240
1 Mar 2010
Hinsley D Rice P Cooke P Sharp R
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Background: Total ankle replacement (TAR) has become an established surgical procedure for the management of end-stage ankle arthropathy offering an alternative to ankle fusion. Controversy exists over whether to correct concomitant hindfoot arthropathy or malalignment as a separate procedure or simultaneously with TAR. Simultaneous surgery confers the advantage of one operation and recovery period, however, many authors believe complication rates may be higher and long-term function compromised.

Method: A retrospective review of all patients, between January 2003 and January 2007, who had undergone simultaneous bony hindfoot or midfoot corrective surgery and TAR, at our institution was performed. A matched group of primary TAR patients were included as controls. Mean follow-up was 38 and 39 months respectively. Data collected included demographics and indications, details of operative procedure, and complications with outcomes assessed by patient satisfaction, range of movement, walking distance and Visual Analogue Score (VAS) for pain.

Results: The two groups were matched for age, sex, follow-up, prostheses and diagnosis. The underlying pathology was predominantly osteoarthritis. Mean VAS improved by 7.66 points in the TAR alone group and 8 points in the TAR and adjuvant surgical procedure group. There was no statistical difference in infection, delayed wound healing, malleolar fracture or re-operation rates between the two groups.

Conclusion: We believe that an experienced Foot and Ankle surgeon can perform corrective hindfoot or mid-foot surgery simultaneously with TAR without significantly compromising outcome.


Orthopaedic Proceedings
Vol. 91-B, Issue SUPP_II | Pages 360 - 360
1 May 2009
Jackson W Cooke P Sharp R
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In 2004, our centre has changed from the “STAR” to the “Mobility” Total Ankle Replacement device and a study was undertaken in order to ascertain if there was a learning curve to useage of this new device and perform a comparison in terms of survival, function, additional procedures and complications.

The indications were 55% osteoarthritis, 30% Rheumatoid and 8% JIA with the remainder being haemophiliac, haemochromatosis and ankylosing spondylitis.

One third of TARs in this unit are combined with additional procedures such as subtalar fusion. Only isolated TARs were considered in this study and the tourniquet time, wound problems, length of stay and known complications for the last 20 STAR TARs was compared to the first 20 Mobility TARs.

68 Mobility TARs have been implanted since Oct 2004 and survival data was collected for this entire cohort and compared to a similar number of STARs.

Results: There was no significant difference in operative time (63 vs 65 mins) between the prostheses, no difference in intra-operative complications (0), no difference in deep infections (0% ) and a minimal difference in hospital stay (4.3 vs 5.1 days) due to non-surgeon factors.

The survival curve of the mobility and STAR shows no loss of the Mobility due to revision at up to 3 years.

Clinical outcome scores will be presented.

Summary: There is no learning curve for an experienced Foot and Ankle Surgeon in changing prosthesis and no apparent effect on morbidity for the patient. All 40 TARs are in situ and functioning acceptably at up to 3 years.

The early results for this new prosthesis show no cause for concern and surveillance is ongoing.