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Orthopaedic Proceedings
Vol. 106-B, Issue SUPP_13 | Pages 22 - 22
17 Jun 2024
Trew C Chambers S Siddique M Qasim S
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One assumed function of Total Ankle Replacement (TAR) is that by maintaining ankle joint motion we can protect the other hind foot joints from further degredation1. However, there is no work to our knowledge that compares hindfoot outcomes between TAR and arthrodesis. Sokolowski et al. found that 68% of TAR patients had no radiological progression of subtalar arthritis after TAR, and 4% went on to fusion2. However, no evaluation of the other hindfoot joints was made and no comparison made to other treatment. We performed a retrospective review of all patients at our centre who had had a TAR or ankle arthrodesis since 2002. Case notes and imaging were reviewed and all instances of hindfoot treatment (injections or surgical procedures) noted. Patients were excluded who had no documentation, were followed up at other hospitals, had prior hindfoot fusion, or were having staged surgeries at the time of index treatment. Chi squared analysis was used to compare the cohorts. 214 arthrodesis cases and 302 TAR were eligible. The average age was 57. Average time to follow up was 13 years (4–21). At the time of abstract submission 107 sets of notes had been reviewed fully. Full analysis will be performed by conference. 14% of TAR patients went on to have further procedures to the hindfoot joints while 35% of arthrodesis patients had further procedures (p=0.014). There was also a significant difference in the number of patients progressing to fusion of a further hindfoot joint between groups (TAR- 4%, arthrodesis- 20%, p=0.01). These data suggest that TAR are protective of symptomatic change of hindfoot joints. Patients with TAR had fewer hindfoot fusions than those with arthrodesis and also fewer procedures of any form, including injections.


Orthopaedic Proceedings
Vol. 106-B, Issue SUPP_13 | Pages 17 - 17
17 Jun 2024
Martin R Sylvester H Ramaskandhan J Chambers S Qasim S
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Introduction

Surgical reconstruction of Charcot joint deformity is increasingly being offered to patients. In our centre a hybrid type fixation technique is utilised: internal and external fixation. This combined fixation has better wound management and earlier mobilisation in this deconditioned patient group. The aim of this study was to assess clinical, radiological and patient reported outcomes for all patients who underwent this hybrid technique.

Methods

This is a prospective observational case series of all patients who underwent surgical reconstruction of Charcot foot deformity in a single centre between June 2017 and June 2023. Patient demographics, smoking status, diabetic control and BMI were recorded. Outcomes were determined from case notes and included clinical outcomes (complications, return to theatre, amputation and mortality) radiological outcomes and patient reported outcomes. The follow up period was 1–7 years post operatively.


Orthopaedic Proceedings
Vol. 103-B, Issue SUPP_3 | Pages 13 - 13
1 Mar 2021
Chambers S Padmore C Fan S Grewal R Johnson J Suh N
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To determine the biomechanical effect of increasing scaphoid malunion and scaphoid non-union on carpal kinematics during dynamic wrist motion using an active wrist motion simulator.

Seven cadaveric upper extremities underwent active wrist flexion and extension in a custom motion wrist simulator with scaphoid kinematics being captured with respect to the distal radius. A three-stage protocol of progressive simulated malunion severity was performed (intact, 10° malunion, 20° malunion) with data analyzed from 45° wrist flexion to 45° wrist extension. Scaphoid malunions were modelled by creating successive volar wedge osteotomies and fixating the resultant scaphoid fragments with 0.062 Kirshner wires. At the completion of malunion motion trials, a scaphoid non-union trial was carried out by removing surgical fixation to observe motion differences from the malunion trials. Motion of the scaphoid, lunate, capitate, and trapezium-trapezoid was recorded and analyzed using active optical trackers.

Increasing scaphoid malunion severity did not significantly affect scaphoid or trapezium-trapezoid motion (p>0.05); however, it did significantly alter lunate motion (p<0.001). Increasing malunion severity resulted in progressive lunate extension across wrist motion (Intact – Mal 10: mean dif. = 7.1° ± 1.6, p<0.05; Intact – Mal 20: mean dif. = 10.2° ± 2.0, p<0.05;) although this change was not as great as the difference seen during non-union trials (native – non-union: mean dif. = 13.8° ± 3.7, p<0.05).

In this in-vitro model, increasing scaphoid malunion severity was associated with progressive extension of the lunate in all wrist positions. The clinical significance of this motion change is yet to be elucidated, but this model serves as a basis for understanding the kinematic consequences of scaphoid malunion deformities.


Orthopaedic Proceedings
Vol. 99-B, Issue SUPP_21 | Pages 9 - 9
1 Dec 2017
Obi N Chambers S Kilit A Kumar C Madeley N
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Introduction

Isolated Weber B fractures usually heal uneventfully but traditionally require regular review due to the possibility of medial ligament injury allowing displacement. Following recent studies suggesting delayed talar shift is uncommon we introduced a functional treatment protocol and present the early results.

Methods

141 consecutive patients presenting acutely with Weber B fractures without talar shift between January and December 2015 were included. Patients were splinted in a removable boot and allowed to weight bear. ED notes and radiographs were reviewed by an Orthopaedic consultant. Patients without signs of medial injury were discharged with an information leaflet and advice. If signs of medial ligament injury were noted or the medial findings were not documented the patient was reviewed in fracture clinic at 4 weeks post-injury. If talar shift developed the patient was to be converted to operative treatment. Olerud and Molander scores were collected between 6 and 12 months post-injury..


Orthopaedic Proceedings
Vol. 99-B, Issue SUPP_21 | Pages 1 - 1
1 Dec 2017
Chambers S Philpott A Lawford C Lau S Oppy A
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Introduction

We describe a novel single incision approach and its safety in the largest reported series of Lisfranc injuries to date. Via separate subcutaneous windows it is possible to access the medial three rays of the foot for bridge plating, without the concern of narrow skin bridges between multiple incisions.

Methods

A retrospective review identified all 150 patients who underwent a Lisfranc ORIF via the modified dorsal approach at the Royal Melbourne Hospital between January 2011 and June 2016. All patients were operated by a single surgeon. Removal of metalwork (ROM) was routinely undertaken at six months post-operatively via the same incision. Medical recored were reviewed to record patient demographics, mechanism of injury and surgical details. Outpatient notes were reviewed to identify wound-related complications including; delayed wound healing, superficial infection, wound dehiscence, deep infection, complex regional pain syndrome (CRPS), neuroma and impaired sensation. Median follow-up was 1012 days (range 188–2141).


The Bone & Joint Journal
Vol. 98-B, Issue 11 | Pages 1534 - 1541
1 Nov 2016
Sprowson† AP Jensen C Chambers S Parsons NR Aradhyula NM Carluke I Inman D Reed MR

Aims

A fracture of the hip is the most common serious orthopaedic injury, and surgical site infection (SSI) is one of the most significant complications, resulting in increased mortality, prolonged hospital stay and often the need for further surgery. Our aim was to determine whether high dose dual antibiotic impregnated bone cement decreases the rate of infection.

Patients and Methods

A quasi-randomised study of 848 patients with an intracapsular fracture of the hip was conducted in one large teaching hospital on two sites. All were treated with a hemiarthroplasty. A total of 448 patients received low dose single-antibiotic impregnated cement (control group) and 400 patients received high dose dual-antibiotic impregnated cement (intervention group). The primary outcome measure was deep SSI at one year after surgery.


Orthopaedic Proceedings
Vol. 98-B, Issue SUPP_12 | Pages 1 - 1
1 Jun 2016
Chambers S Kumar C Rymaszewski L Madeley N
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Isolated Weber B fractures usually heal uneventfully but traditionally require regular review due to the possibility of medial ligament injury allowing displacement. Following recent studies suggesting that delayed talar shift is uncommon we introduced a functional treatment protocol and present the early results.

86 patients presenting acutely with Weber B fractures without talar shift between January and July 2015 were included. Patients were splinted in a removable boot and allowed to weight bear. ED notes and radiographs were reviewed by an Orthopaedic consultant. Patients without signs of medial injury were discharged with an information leaflet and advice. If signs of medial ligament injury were noted or the medial findings were not documented the patient was reviewed in fracture clinic at 4 weeks post-injury. If talar shift developed the patient was to be converted to operative treatment. MOXFQ and EDQ5 scores were collected.

50 patients had signs of medial ligament injury or no documented medial findings and of these 43 attended fracture clinic. Of 36 patients without signs of medial ligament injury 28 were discharged according to protocol and 8 patients attended fracture clinic. One discharged patient re-accessed care. Of 52 patients reviewed in the fracture clinic none developed delayed talar shift and all continued with non-operative treatment. The outcome scores were comparable to those in the published literature.

We conclude the risk of delayed talar shift is low and satisfactory outcomes can be safely achieved with our functional protocol. Additional tests/imaging to establish the integrity of the medial ligament may be unnecessary.


Orthopaedic Proceedings
Vol. 97-B, Issue SUPP_14 | Pages 22 - 22
1 Dec 2015
Chambers S Goldberg A Cullen N Singh D
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This study used the lunge test to measure the difference between ankle dorsiflexion with the knee flexed and extended in persons with and without foot and ankle pathology. This may help us devise a weight bearing test for GT.

Rationale

There is little credible research comparing GT in people with and without foot and ankle pathology. There is no normative data for ankle dorsiflexion range measured using a Lunge test and prevalence of GT in the normal population.

Methodology

97 ankles with foot and ankle (FA) pathology and 89 ankles of healthy volunteers (HV) without FA pathology were recruited from the royal national orthopaedic hospital (RNOH). Degrees of ankle dorsiflexion range were measured using an inclinometer and a version of the lunge test with the knee flexed and extended. These findings were then compared between groups.


Orthopaedic Proceedings
Vol. 95-B, Issue SUPP_33 | Pages 10 - 10
1 Sep 2013
Jensen C Gupta S Sprowson A Chambers S Inman D Jones S Aradhyula N Reed M
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The cement used for hemiarthroplasties by the authors and many other surgeons in the UK is Palacos® (containing 0.5g Gentamicin). Similar cement, Copal® (containing 1g Gentamicin and 1g Clindamycin) has been used in revision arthroplasties. We aim to investigate the effect on SSI rates of doubling the gentamicin dose and adding a second antibiotic (clindamycin) to the bone cement in hip hemiarthroplasty.

We randomised 848 consecutive patients undergoing cemented hip hemiarthroplasty for fractured NOF into two groups: Group I, 464 patients, received standard cement (Palacos®) and Group II, 384 patients, received high dose, double antibiotic-impregnated cement (Copal®). We calculated the SSI rate for each group at 30 days post-surgery. The patients, reviewers and statistician were blinded as to treatment group.

The demographics and co-morbid conditions were statistically similar between the groups. The combined superficial and deep SSI rates were 5 % (20/394) and 1.7% (6/344) for groups I and II respectively (p=0.01). Group I had a deep infection rate 3.3 %(13/394) compared to 1.16% (4/344) in group II (p=0.082). Group I had a superficial infection rate 1.7 % (7/394) compared to 0.58% (2/344) in group II (p=0.1861). 33(4%) patients were lost to follow up, and 77 (9%) patients were deceased at the 30 day end point.

Using high dose double antibiotic-impregnated cement rather than standard low dose antibiotic-impregnated cement significantly reduced the SSI rate (1.7% vs 5%; p=0.01) after hip hemiarthroplasty for fractured neck of femur in this prospective randomised controlled trial.


Orthopaedic Proceedings
Vol. 95-B, Issue SUPP_31 | Pages 53 - 53
1 Aug 2013
Jensen C Gupta S Sprowson A Chambers S Inman D Jones S Aradhyula N Reed M
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Currently, the cement being used for hemiarthroplasties and total hip replacements by the authors and many other surgeons in the UK is Palacos® (containing 0.5g Gentamicin). Similar cement, Copal® (containing 1g Gentamicin and 1g Clindamycin) has been used in revision arthroplasties, and has shown to be better at inhibiting bacterial growth and biofilm formation. We aim to investigate the effect on SSI rates of doubling the gentamicin dose and adding a second antibiotic (clindamycin) to the bone cement in hip hemiarthroplasty.

We randomised 848 consecutive patients undergoing cemented hip hemiarthroplasty for fractured NOF at one NHS trust (two sites) into two groups: Group I, 464 patients, received standard cement (Palacos®) and Group II, 384 patients, received high dose, double antibiotic-impregnated cement (Copal®). We calculated the SSI rate for each group at 30 days post-surgery. The patients, reviewers and statistician were blinded as to treatment group.

The demographics and co-morbid conditions (known to increase risk of infection) were statistically similar between the groups. The combined superficial and deep SSI rates were 5 % (20/394) and 1.7% (6/344) for groups I and II respectively (p=0.01). Group I had a deep infection rate 3.3 %(13/394) compared to 1.16% (4/344) in group II (p=0.082). Group I had a superficial infection rate 1.7 % (7/394) compared to 0.58% (2/344) in group II (p=0.1861). 33(4%) patients were lost to follow up, and 77 (9%) patients were deceased at the 30 day end point. There was no statistical difference in the 30 day mortality, C. difficile infection, or the renal failure rates between the two groups.

Using high dose double antibiotic-impregnated cement rather than standard low dose antibiotic-impregnated cement significantly reduced the SSI rate (1.7% vs 5%; p=0.01) after hip hemiarthroplasty for fractured neck of femur in this prospective randomised controlled trial.


Orthopaedic Proceedings
Vol. 95-B, Issue SUPP_1 | Pages 204 - 204
1 Jan 2013
Chambers S Dowen D Muthumayandi K Mchutchon A Kramer D
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Introduction

Surgical spacesuits are in widespread use. Only one previous study (JBJS 1998) has assessed the quality of the environment within the space suit. They demonstrated that surgical spacesuits could allow re-breathing of carbon dioxide (CO2). However, they had no control group and performed a vigorous exercise protocol which may have been an unfair test. The design of helmet systems has also evolved in the last decade. We have conducted the first investigation into CO2 levels inside the modern space suit. There is a Workplace Exposure Limit for inspired CO2 as determined by the Health and Safety Executive (UK), which is 0.506kPa. We wondered whether re-breathing of CO2 in space suits would lead to inspired CO2 which breaches this level.

Methods

We used an anaesthetic room gas analyzer via nasal cannulae to measure inspired (ICO2) levels in 12 healthy volunteers. Readings were taken while wearing a surgical space suit with the fan on high and low settings. These were compared with a normal surgical facemask. Readings were repeated on mild exertion to simulate the effort of performing arthroplasty surgery.


Orthopaedic Proceedings
Vol. 94-B, Issue SUPP_XLI | Pages 81 - 81
1 Sep 2012
Locker J Hooper G Chambers S
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Determine if debridement, rather than staged revision is a more effective strategy in some patient subgroups with infected arthroplasty

We compiled a database comprising 154 proven infected knee replacements and 144 infected hip replacements in Christchurch over the last 10 years. This has given us the largest series in the literature. Cross referencing this database with the joint registry enabled us to compare the treatment of both acute and chronic infection in hip and knee arthroplasty with regard to both functional outcome and re-revision rate.

Patients treated with debridement had no statistically significant difference in re-revision rate or functional score when compared with patients undergoing staged revision.

Orthopaedic surgeons justifiably aim to eradicate infection in arthroplasty patients. A prosthesis retaining management strategy may be justifiable, especially in certain patient groups in whom multiple operations are best avoided.


Orthopaedic Proceedings
Vol. 94-B, Issue SUPP_XXIX | Pages 61 - 61
1 Jul 2012
Chambers S Jones M Michla Y Kader D
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The purpose of this study was to determine the accuracy of MRI scan for the detection of meniscal pathology in our unit. There are published data which show that both sensitivity and specificity can approach 90% when compared to arthroscopic findings.

We retrospectively analysed a single surgeon series of 240 scopes for all indications The arthroscopic reports included an outline diagram of the meniscus upon which the surgeon recorded operative findings. 112 of these patients had also had recent MRI.

We looked at whether the MRI report showed a tear, and this was graded Y/N. The arthroscopic report was graded for tear: Y/N. 66 patients had a positive scan. 64 of these were found to have a tear at surgery. 37 scans were reported as “no tear”, of which 4 were found to have a tear at surgery. Nine scans were not easy to classify as they were descriptive.

In our series of 112 knees, MRI was 90.5% sensitive, 89.5% specific and 90.1% accurate.

When a definite diagnosis of “tear”, or “no tear” was made at scan, there were two false positives and four false negatives. False positives may be unnecessarily exposed to the risks of surgery. Patients with negative scans had a mean delay to surgery of 33 weeks compared to 18 weeks for patients with positive scans. False negatives may wait longer for their surgery. Two of the false negative scans clearly showed meniscus tears which were missed by the reporting radiographer. In our series the scan itself was more accurate than the reporting. It is important to have an experienced musculoskeletal radiologist to minimise the number of missed tears. It is also important for surgeon to check the scan as well as the report.