Introduction

Typical UK patients spend 5–7 days in hospital following total hip replacement (THR). Decreasing length of stay (LOS) increases throughput and reduces cost. We have developed a short stay THR programme (SSP), which has been used in all patients since May 2006; we present the first 100.

Introduction

The Oxford Total Meniscal Knee (TMK by Biomet), is a total knee replacement with a multidirectional mobile bearing. As part of the evaluation of the TMK we compared our group of TMK knee replacements with an equivalent cohort of AGC total knee replacements.

Introduction

Debate continues regarding the relative advantages of ceramic-on-ceramic (CoC) and metal-on-polyethylene (MoP) articulations in total hip arthroplasty (THA). Perceived benefits of CoC include longevity, and low wear - in turn limiting the effects of particulate wear debris. However, CoC bearings cost significantly more, and concern remains over the risk of ceramic fracture; a complication not seen with MoP bearings, which are also cheaper.

Introduction

Deep vein thrombosis(DVT) and pulmonary embolism(PE) are well-recognised complications following lower limb arthroplasty (Cohen et al, 2001). The National Institute for Clinical Excellence and British Orthopaedic Association recommend the use of both mechanical and chemical prophylaxis. At our institute regimens have changed reflecting new developments in the use of thombo-prophylaxis. Our aim was to assess the efficacy of these methods in preventing complications.

Recent interest has focused on minimally invasive hip surgery, with less attention being directed to maximising the potential benefits of this type of surgery. We have developed a new multidisciplinary programme for patients undergoing total hip replacement in order to facilitate an overnight hip replacement service.

The programme involves a pre-operative regimen of education and physiotherapy, a modified anaesthetic technique, a minimally invasive surgical approach and a portable local anaesthetic pump infusion for post-operative pain control. Strict inclusion and exclusion criteria were developed based on age, medical status and social circumstances. Patients were mobilised on the day of their operation and discharged home with an ‘outreach team’ support network. No patient complained that their discharge was early. Independent evaluation was performed using the Oxford Hip Questionnaire, the Merle d'Aubigné clinical rating system and Visual Analogue Pain Scores. Thirty seven patients underwent total hip replacement using the new protocol.

The average length of stay was 1.2 days. The mean pain score on discharge was 1.3/10. The Oxford Hip Questionnaire and Merle d'Aubigné scores were comparable to patients who underwent surgery prior to the introduction of the new protocol. Minimising in-patient stay for total hip replacement benefits the patient by reducing exposure to nosocomial infection and expediting the return to a normal environment for faster rehabilitation. This new programme allows patients undergoing total hip replacement to be discharged after 1 night post-operatively without compromising safety or quality of care.

Minimally invasive surgery with a suitable infrastructure can be used to dramatically reduce the length of stay in suitable patients. This can be achieved reliably, safely and with high patient satisfaction. In order to gain the benefit of Minimally Invasive Surgery we recommend introducing this type of comprehensive programme.

Aims

To compare a randomised group of patients undergoing UKA to investigate the advantages of the minimal invasive approach in the early post-operative stage.

Introduction

Hydroxyapatite (HA) coated femoral stems require a press fit for initial stability prior to osteointegration occurring. However this technique can lead to perioperative femoral fracture.

This study aims to assess prospectively whether measurement of perioperative Troponin T is a useful predictor of potential morbidity and mortality in patients undergoing surgery for fractured neck of femur.

All patients aged 65 years and over presenting with a fractured neck of femur over a 4-month period were initially included. Exclusion criteria were renal failure, polymyositis and conservative fracture management. Troponin T levels were measured on admission, day 1 and 2 post-surgery. According to local protocol, a level of >0.03ng/mL was considered to be raised. Outcome measures adverse were cardiorespiratory events (myocardial infarction, congestive cardiac failure, unstable angina, major arrhythmias requiring treatment and pulmonary embolism), death and length of inpatient stay.

108 patients were recruited after application of the exclusion criteria. 42 (38.9%) showed a rise in Troponin T >0.03ng/mL in at least one sample. Of these, 25 (59.5%) sustained at least outcome complication, as opposed to 7 (10.6%) from the group with no Troponin T rise (p<0.001). The mean length of stay was 25.7 days for patients with elevated Troponin T levels, compared with 18.3 days in the normal group (p<0.012). There were 9 deaths in the raised Troponin group (21.4%), and 5 (7.6%) in the group with no rise (p<0.05).

The principal causes of early death after hip fracture surgery are cardiac failure and myocardial infarction. Troponin T is a sensitive enzymatic marker of myocardial injury. The association between raised Troponin and hip fractures has not previously been made. In our series, 38.9% showed a perioperative Troponin rise. This was significantly associated with increased morbidity, mortality and longer hospitalisation. Many hip fracture patients appear to be having silent cardiorespiratory events, contributing significantly to perioperative morbidity.

We recommend measurement of Troponin levels in all such patients to identify this risk and initiate appropriate treatment.

Introduction: Minimally Invasive Hip surgery has been described using several different surgical techniques. These can be divided into two broad groups, those that utilise smaller incision version of a conventional approach (mini-posterior) and those that use a muscle-sparing technique (direct anterior). The muscle-sparing technique has been promoted as the only true Minimally-invasive Total Hip Replacement (MISTHR) as it intuitively appears more minimally invasive with less soft tissue disruption. We have therefore carried out a prospective analysis of 60 consecutive direct anterior MISTHRs case-matched to 60 mini-posterior MISTHRs.

Materials and Methods: We prospectively analysed 60 consecutive, direct anterior approach patients with case-matched mini-posterior approach patients. Functional outcome was assessed with the Visual Analogue Pain Score (VAS), Merle d’Aubigne Postel (MDP), the Oxford Hip (OHQ) and SF-36 questionnaires at 6 weeks and 6 months post-operatively. Peri-operative blood loss, length of surgery and length of stay were recorded.

Results: (table removed)

Conclusions: Our conclusions are that both approaches are safe, with low complication rates and offer excellent clinical outcomes. However, there is no significant difference between the two approaches justifying the more technically difficult, but muscle-sparing anterior approach.

This study aims to assess prospectively whether measurement of peripoperative Troponin T is a useful predictor of potential morbidity and mortality in patients undergoing surgery for fractured neck of femur.

All patients aged 65 years and over presenting with a fractured neck of femur over a 4-month period were initially included. Exclusion criteria were renal failure, polymyositis and conservative fracture management. Troponin T levels were measured on admission, day 1 and 2 post surgery. According to local protocol, a level of > 0.03ng/mL was considered to be raised. Outcome measures adverse were cardiorespiratory events (myocardial infarction, congestive cardiac failure, unstable angina, major arrhythmias requiring treatment and pulmonary embolism), death and length of inpatient stay.

108 patients were recruited after application of the exclusion criteria. 42 (38.9%) showed a rise in Troponin T > 0.03ng/mL in at least one sample. Of these, 25 (59.5%) sustained at least outcome complication, as opposed to 7 (10.6%) from the group with no Troponin T rise (p< 0.001). The mean length of stay was 25.7 days for patients with elevated Troponin T levels, compared with 18.3 days in the normal group (p< 0.012). There were 9 deaths in the raised Troponin group (21.4%), versus 5 (10.6%) in the group with no rise (p< 0.05).

The principle causes of early death after hip fracture surgery are cardiac failure and myocardial infarction. Troponin T is a sensitive enzymatic marker of myocardial injury. The association between raised Troponin and hip fractures has not previously been made. In our series, 38.9% showed a perioperative Troponin rise. This was significantly associated with increased morbidity, mortality and longer hospitalisation. Many hip fracture patients appear to be having silent cardiorespiratory events, contributing significantly to perioperative morbidity. We recommend measurement of Troponin levels in all such patients to identify this risk and initiate appropriate treatment.

Introduction: Recently there has been much interest in minimally invasive hip surgery, with less attention being directed to maximising the potential benefits of this type of surgery. We have developed a new multidisciplinary program for patients undergoing total hip replacement in order to facilitate an overnight hip replacement service.

Methods: The program involves a pre-operative regimen of education and physiotherapy, a modified anaesthetic technique, a minimally invasive surgical approach and a portable local anaesthetic pump infusion for post-operative pain control. Strict inclusion and exclusion criteria were developed based on age, medical status and social circumstances. Patients were mobilised on the day of their operation and discharged home with an ‘outreach team’ support network. No patient complained that their discharge was too early. Independent evaluation was performed using the Oxford Hip Questionnaire, the Merle d’Aubigne clinical rating system and Visual Analogue Pain Scores.

Results: Thirty seven patients underwent total hip replacement using the new protocol.

The average length of stay was 1.2 days. The mean pain score on discharge was 1.3/10. The Oxford Hip Questionnaire and Merle d’Aubigne scores were comparable to patients who underwent surgery prior to the introduction of the new protocol. Minimising in-patient stay for total hip replacement benefits the patient by reducing exposure to nosocomial infection and expediting the return to a normal environment for faster rehabilitation. This new program allows patients undergoing total hip replacement to be discharged after 1 night post operatively without compromising safety or quality of care.

Conclusion: Minimally invasive surgery with a suitable infrastructure can be used to dramatically reduce the length of stay in suitable patients. This can be achieved reliably, safely and with high patient satisfaction. In order to gain the benefit of Minimally Invasive Surgery we recommend introducing this type of comprehensive program.

Introduction: The principle causes of early death after hip fracture surgery are cardiac failure and myocardial infarction. Troponin T is a sensitive and specific enzymatic marker of myocardial injury. This study aims to assess prospectively whether Troponin T may be used as a predictor of morbidity and mortality in admissions with fractured neck of femur.

Methods: All patients aged 65 years and over presenting with a fractured neck of femur over 4 months were included. Exclusion criteria of polymyositis, renal failure and conservative fracture management were applied. Troponin T levels were measured on admission, and days 1 and 2 post surgery. According to local protocol, a level of > 0.03ng/mL was considered to be raised. Outcome measures were defined as adverse cardiorespiratory events (myocardial infarction, congestive cardiac failure, unstable angina, major arrhythmias requiring treatment and pulmonary embolism), death and length of inpatient stay.

Results: 108 patients were recruited over the 4 months. 42 (38.9%) showed a rise in Troponin T > 0.03ng/mL in at least one sample. Of these, 25 (59.5%) sustained at least one of the outcome complications including death, as opposed to 7 (10.6%) from the group with no Troponin rise (p< 0.001). The mean inpatient stay was 25.7 days for patients with elevated Troponin T levels, compared with 18.3 days in the normal group (p< 0.012). There were 9 deaths in the raised Troponin group (21.4%), and 5 (10.6%) in the group with no rise (p< 0.05).

Discussion: The association between raised Troponin and hip fractures has not previously been made. Many patients appear to be having silent cardiorespiratory or related events, which may be a significant cause of perioperative morbidity and mortality. We propose measurement of Troponin levels as part of the standard perioperative screening for hip fracture patients to identify this risk and initiate appropriate treatment measures.

Introduction: High-frequency ultrasound is an effective mechanism for coagulating and cutting tissue. We report the first use of the ultrasonic scalpel in orthopaedic surgery, with the aim of minimising blood loss and tissue trauma in minimally invasive total hip replacement.

Methods: This is a prospective, single-blind, case-matched study to compare blood loss in minimally invasive total hip replacement using an ultrasonic scalpel versus electrodiathermy. Twenty cases have been performed via a minimally invasive posterior approach. The treatment was otherwise no different between the two groups. The groups were compared with regard to blood loss, post-operative pain and wound healing.

Results: The mean intra-operative blood loss in the ultrasonic scalpel group was 242mls compared with 319mls in the electrodiathermy group. This is statistically significant (p < 0.05). The percentage drop in Haemoglobin was also reduced in the ultrasonic scalpel group (18.9% compared with 26.4%), which is also statistically significant (P< 0.01). There was no significant difference in the operating time or post-operative pain scores and there were no wound complications in either group.

Discussion: The ultrasonic scalpel works by converting electrical energy into mechanical energy resulting in longitudinal oscillation of the blade at 55,500Hz. This achieves coagulation and tissue dissection at lower temperatures than standard diathermy. The potential advantages include less lateral tissue damage, minimal smoke and no electrical energy passed to or through the patient. With the development of minimally invasive hip replacement surgery this technique can be used to reduce tissue trauma. The initial results from this study suggest that the ultrasonic scalpel has a useful role in minimally invasive hip replacement surgery in terms of reducing blood loss and tissue trauma. This may help to facilitate early mobilisation and reduced hospital stay.

Introduction: Acetabular loosening can limit long-term success of total hip replacement. There are at least 62 different prosthesis designs available in the UK, many of which have no long term results. Revision surgery is expensive, challenging and potentially dangerous. There is still currently debate about the best method of acetabular fixation, in particular, regarding the use of press fit devices in elderly osteoporotic bone. Our study aims to test the null hypothesis that there is no significant difference in outcome between cemented and non-cemented acetabular fixation in this group of patients.

Methods: Patients over 72 years of age were prospectively randomised to receive either a cemented Exeter cup or a HA coated press fit cementless cup. Both groups received a cemented Exeter stem. The patients were assessed pre-operatively and reviewed at 6 weeks, 6 months and yearly in a research clinic, by an independent observer. Outcome measures were the Merle D’Aubignon Postel, Oxford Hip and Visual analogue pain scores. The implants were also assessed radiographically and all complications were recorded.

Results: To date 151 patients have been recruited into the trial. 2 year data is available for 69 patients. There were no differences in satisfaction, pain or hip scores between the groups.

There have been no major surgical complications. In particular, there have been no failures of acetabular fixation, dislocations or deep infections.

Discussion: There have been no failures in either group. Although there is insufficient data at this stage to reject our null hypothesis, there is no early evidence for concern in using cementless cups in elderly patients.

AIMS: To compare a randomised group of patients undergoing UKA to investigate the advantages of the minimal invasive approach in the early post-operative stage.

METHODS & RESULTS: 100 patients on the waiting list for UKA were recruited into the trial. Patients were randomised into 2 groups: Group 1 – longitudinal skin incision with dislocation of the patella, Group 2 – the minimally invasive approach. Standard milestones were recorded post-operatively: time to achieve IRQ, independent stair climbing and to discharge. Additionally, patients were scored with the AKSS and Oxford knee questionnaire pre-operatively, at 6 weeks, 6 months and 1 year.

No significant differences were found between the 2 groups in the measured parameters.

CONCLUSION: To our knowledge, there has been no previous randomised trial to investigate the results of less invasive surgery for UKA. We have been unable to demonstrate a significant advantage of this approach. With the continued drive for early return to function, some centres incorporate a 24hr accelerated discharge protocol. The less invasive approach may make this more achievable. We recommend however that the surgical procedure and implant position must not be compromised for the benefit of rapid discharge to the deficit of long term results.

Introduction: Debate continues regarding the optimal timing of surgery for patients requiring bilateral knee arthroplasty; we reviewed the costs, clinical and functional outcomes of 116 patients undergoing simultaneous or staged bilateral surgery using 3 different prostheses.

Method: Data were retrospectively collected from 116 consecutive patients undergoing 232 knee replacements over 10 years, either simultaneously or over 2 hospital admissions (staged). Post-operative complication rate, total cost of treatment (calculated from pros-theses, theatre time, days in hospital and number of clinic attendances) and functional (HSS) score at 1 year were the outcome measures.

Results: 54 patients underwent Oxford unicondylar knee replacements, 41 simultaneously, 13 staged; respective mean total costs were £9890 and £13,553 (p< 0.001). 42 patients were treated with AGC prostheses; 14 simultaneously, 28 staged, with respective total costs of £12,187 and £16,920 (p< 0.001). 10 TMK patients had simultaneous surgery (mean total cost £14,812), 10 were staged (£20,191); p< 0.001. For all 3 prostheses, there was no significant difference in complication rate or 1 year functional outcome between simultaneous and staged groups.

Discussion: Some authors advocate replacing both knees simultaneously as safe and cost-effective; others report significant increases in medical and surgical morbidity. Our series shows significant cost savings with no increase in complication rate.

The 98 % 10-year survivorship of cemented AGC TKR is regarded as gold standard.(1) The authors attributed their excellent results to the flat-on-flat design and compression-moulded polyethylene.

The aim of this trial is to determine if the type of fixation also influences outcome.

Participants were randomly allocated to either a cemented or cementless hydroxyapatite-coated AGC prosthesis. All patients were assessed with the Hospital for Special Surgery Score (HSS) and radiographs pre- and post-operatively at six weeks, six months and annually.

223 knees were studied with a mean follow-up of 53.4 months (max.10 years).

There were no significant differences between the two groups in post-operative HSS scores or in improvement of HSS scores. There has been no observable migration in either group. There has been 1 case requiring revision from the HAC group and 2 patellar buttons were revised following traumatic separation.

The early results are equally good for both groups with no significant difference in outcome or complication rate between cemented and HA coated fixation.

Introduction Total hip replacement is the commonest arthroplasty procedure performed in the UK. The in-patient stay has gradually reduced and patients now typically spend five to seven days in hospital. We have developed a new multidisciplinary protocol for patients undergoing total hip replacement in order to facilitate early discharge.

The aims of this study were to prospectively assess whether this new protocol could be safely applied to patients undergoing total hip replacement and whether it reduced length of stay.

Methods The protocol involved a pre-operative program of education and physiotherapy, a modified anaesthetic regime, a minimally invasive surgical approach and a portable local anaesthetic pump infusion for post operative pain control. Strict inclusion and exclusion criteria were developed based on age, medical status and social circumstances. Patients were mobilised on the day of their operation and discharged to an outreach team support network. Independent evaluation was performed using the Oxford Hip Questionnaire, the Merle dAubigne clinical rating system and Visual Analogue Pain Scores.

Results Twenty-five patients underwent total hip replacement using the new protocol. All patients were discharged home within 48 hours of surgery. There were two unplanned reattendances neither of which required readmission. The mean pain score on discharge was 3/10. The Oxford Hip Questionnaire and Merle dAubigne scores were comparable to patients who underwent surgery prior to the introduction of the new protocol.

Discussion Minimising in-patient stay for total hip replacement benefits the patient by reducing exposure to nosocomial infection and expediting the return to a normal environment for rehabilitation. It may also help to improve efficiency and alleviate pressure on an overburdened health service. This new protocol allows patients undergoing total hip replacement to be discharged within 48 hours of undergoing surgery without compromising safety or quality of care.

Introduction High-frequency ultrasound is an effective mechanism for coagulating and cutting tissue. We report the first use of the ultrasonic scalpel in orthopaedic surgery, with the aim of minimising blood loss and tissue trauma in minimally invasive total hip replacement.

Methods This is a prospective, single-blind, case-matched study to compare blood loss in minimally invasive total hip replacement using an ultrasonic scalpel versus electrodiathermy. Twenty cases have been performed via a minimally invasive posterior approach. The treatment was otherwise no different between the two groups. The groups were compared with regard to blood loss, postoperative pain and wound healing.

Results The mean intraoperative blood loss in the ultrasonic scalpel group was 156mls compared with 295mls in the electrodiathermy group. This is highly statistically significant. The percentage drop in Haemoglobin was also reduced in the ultrasonic scalpel group (18.9% compared with 26.4%), which is also statistically significant. There was no significant difference in the operating time or post-operative pain scores and there were no wound complications in either group.

Discussion The ultrasonic scalpel works by converting electrical energy into mechanical energy resulting in longitudinal oscillation of the blade at 55,500Hz. This achieves coagulation and tissue dissection at lower temperatures than standard diathermy. The potential advantages include less lateral tissue damage, minimal smoke and no electrical energy passed to or through the patient. With the development of minimally invasive hip replacement surgery this technique can be used to reduce tissue trauma.

Conclusion The initial results from this study suggest that the ultrasonic scalpel has a useful role in minimally invasive hip replacement surgery in terms of reducing blood loss and tissue trauma. This may help to facilitate early mobilisation and reduced hospital stay.