Comparison of acetabular reamings during hip resurfacing versus uncemented total hip arthroplasty.

PURPOSE: To compare the quantity of bone removed from the acetabulum during resurfacing hip arthroplasty versus uncemented total hip arthroplasty (THA). METHODS: 62 consecutive patients with osteoarthritis of the hip were prospectively studied. 24 men and 7 women aged 40 to 86 (mean, 59) years underwent Birmingham hip resurfacing. 13 men and 18 women aged 34 to 88 (mean, 61) years underwent uncemented THA using the trident acetabular cup. Obese elderly women at risk of femoral neck fracture and patients with large subchondral pseudocysts or a history of avascular necrosis of the femoral head were assigned to uncemented THA. Acetabular reamings were collected; marginal osteophytes were not included. The reamings were dehydrated, defatted, and weighed. RESULTS: The mean weight of acetabular reamings was not significantly different between patients undergoing hip resurfacing and uncemented THA (p=0.57). CONCLUSION: In hip resurfacing, the use of an appropriately small femoral component avoids oversizing the acetabular component and removal of excessive bone stock.

Anti-platelet agents and surgical delay in elderly patients with hip fractures.

PURPOSE: To assess the risk of surgical delay in elderly hip fracture patients on anti-platelet agents. METHODS: Records of 180 patients aged over 65 years with either an intertrochanteric or femoral neck fracture were reviewed. The clopidogrel group included 10 patients on clopidogrel alone and 11 others on clopidogrel and aspirin, whereas the control group included 69 on aspirin alone and the remaining 90 not on any anti-coagulants. The 2 groups were compared with regard to time to surgery, preoperative American Society of Anesthesiologists (ASA) score, pre- and post-operative haemoglobin levels, in-patient complication rates, duration of hospital stay, and 30-day mortality. RESULTS: In the clopidogrel and control groups respectively, the mean times to surgery were 7.2 and 2.1 days (p=0.03, t-test), the mean preoperative ASA scores were 3.35 and 2.8 (p=0.29, t-test), the mean preoperative haemoglobin levels were 119 and 115 g/l (p=0.5, t-test), the mean postoperative haemoglobin levels were 98 and 96 g/l (p=0.68, t-test), the mean durations of hospital stay were 7.4 and 3.1 days (p=0.02, t-test). The 30-day mortalities were 6/21 (29%) and 6/159 (4%) [p=0.0003, Fisher's exact test]. CONCLUSION: Surgical delay in elderly patients on anti-platelet agents with hip fracture was associated with higher mortality. Despite the risk of increased blood loss, we suggest early surgery be carried out by an experienced surgeon to expedite the operating time. Pooled platelets should be given intravenously one to 2 hours preoperatively.

The cost and mortality of hip fractures in centenarians.

BACKGROUND: Centenarians are the fastest rising age group in Ireland. Hip fractures most commonly affect older adults and are associated with significant morbidity and mortality, as well as the financial cost of healthcare resources. Despite this, very little is known regarding hip fractures in centenarians. The aim of this study was to investigate our experience with hip fractures in this group and to record the cost of treating these fractures to identify both the social and economic impact these injuries impose on the health system. METHODS: The study was a retrospective data review at a major trauma centre. Nine proximal femoral fractures from June 2010-2016 were identified through a stepwise analysis of theatre data and patient notes. Time of death was recorded directly from patient records or by contacting the patient's general practitioner. With the assistance of the hospital finance department, individual inpatient costs were calculated using length of stay, theatre time and implant costs. RESULTS: Over the 7-year period we examined nine patients over 100 years of age were managed operatively for hip fractures with an average inpatient cost of €14,898. The mean age at the time of fracture was 101 years and 7 months. Eight of the patients were female and there was one male. Our inpatient, 30-day and 1-year mortality rate were 22, 22, and 71%. CONCLUSIONS: The 1-year mortality rate of any person aged 100 years or older is thought to be 67% for men and 59% for women. This suggests that the 1-year mortality rate of 71% in this current study is only slightly worse than the usual life expectancy of a person older than 100 years of age. Our data suggest that the extreme elderly should be offered operative management.

Odontoid lateral mass asymmetry: do we over-investigate?

OBJECTIVES: This study aimed to evaluate the necessity for further radiological investigation in patients with suspected traumatic rotatory subluxation of the atlanto-axial complex on plain radiography following acute cervical trauma and outline guidelines for assessment of patients with atlanto-axial asymmetry on plain radiography. METHODS: A retrospective review of all patients who had undergone atlanto-axial CT scanning as a result of radiographic C1-C2 asymmetry following cervical spine trauma. The plain x ray and CT images were reviewed retrospectively and correlated with the clinical presentation and outcome. RESULTS AND CONCLUSION: Records of 29 patients (16 men, 13 women; age range 21-44 years) were reviewed. All patients were found to have atlanto-odontoid asymmetry on the initial plain x ray. CT images of none of the patients revealed rotatory subluxation. Ten patients (32%) were found to have congenital odontoid lateral mass asymmetry. All patients were treated conservatively without any further intervention. On review, in 19 patients the orientation of the x ray beam in combination with head rotation was found to be at fault. Approximately 1050 trauma cervical spine x rays were taken in the department where this study was conducted over the period 1999-2001. This study identified 10 patients out of a total of 29 as having congenital odontoid lateral mass asymmetry. This represents approximately 1% of the patients attending the emergency department. Thus congenital odontoid lateral mass asymmetry should be considered in the differential diagnosis following acute cervical trauma.

The need for multidisciplinary management of patients with upper thoracic spine fractures caused by high-velocity impact: a review of 32 surgically stabilised cases.

PURPOSE: To analyse the characteristics of patients who underwent surgery for fractures of the upper thoracic spine (T1-T6) in our institution. The thoracic spine is supported by the rib cage and associated ligaments; therefore, displacement and fracture of the upper thoracic spine in healthy young adults require a great force. The relatively narrow spinal canal around the spinal cord in this area could result in severe neurological deficit should fractures occur. METHODS: The treatment course of 32 patients (26 men and 6 women) who underwent surgery for fractures of the upper thoracic spine between February 1995 and March 2001 was retrospectively reviewed. Parameters of injuries and treatment methods were evaluated. RESULTS: Of the 32 patients, 29 were injured in traffic accidents (15 motorcycle and 14 vehicle), 2 in falls, and one by a heavy door falling on his back. 29 patients had spinal fractures at more than one level. 23 patients had complete, 7 had incomplete, and 2 had no neurological deficit. 30 patients required multiple modalities of radiological imaging (in addition to plain radiography) for diagnosis. 20 patients sustained other injuries apart from spinal fractures, 15 of them had associated chest injuries. CONCLUSION: High-velocity fractures of the upper thoracic spine are injuries with devastating consequences, and can result in severe neurological deficit and concomitant injuries. These patients are best treated by a multidisciplinary approach.

Recognition of progressive atlanto-occipital dislocation (by a changing neurologic status and clinical deformity).

We present a case of progressive atlanto-occipital dislocation, recognized by a new onset of positive neurologic findings. We discuss the anatomic relationship of the lower four cranial nerves to the foramen magnum and the atlanto-occipital joint. The importance of careful assessment of the cranial nerves prior to choosing a treatment algorithm is emphasized.

Percutaneous cementoplasty of acetabular bony metastasis.

The development of malignant lesions in the acetabulum can lead to painful and disabling bone destruction. Lytic metastases of the acetabulum are frequent, causing pathologic fractures, pain and disability. The literature is sparse in relation to the exact indications and technique for this procedure. Percutaneous injection of methylmethacrylate or ethanol may provide marked pain relief or bone strengthening in patients, with malignant acetabular destruction, who are unable to tolerate surgery. Injection of methylmethacrylate is usually indicated when the weight-bearing part of the acetabulum is involved. The goals of treatment are pain relief and mechanical strengthening of the acetabulum. Radiography and computed tomography must be performed prior to therapeutic percutaneous injection to assess the location and extent of the lytic process, the presence of cortical destruction or fracture, and the presence of soft-tissue involvement. We report a case of a 39-year-old woman with a secondary acetabular lesion, which was treated successfully with percutaneous acetabular cementoplasty. We describe a novel technique used to inject cement into the lesion, allowing for greater cement volume and pressurisation within the lesion.

Bizarre parosteal osteochondromatous proliferation (Nora's lesion) of the sesamoid: a case report.

We report the a case of Nora's lesion (Bizarre Parosteal Osteochondromatous Proliferation) of the sesamoid. A 32-year-old woman presented with a painless, enlarging mass of two years duration on the plantar aspect of the first metatarsophalangeal joint of the left foot. Radiographs, Computerized Tomographs and Magnetic Resonance images, initially suggested a parosteal osteosarcoma arising from the tibial sesamoid. The mass was excised, and a histological diagnosis of Bizarre Parosteal Osteochondromatous Proliferation of bone (Nora's lesion) was made. The aggressive growth of this lesion may suggest a neoplasm clinically. Histological features, however, are those of a reactive lesion.

Fixation of tibial plateau fractures with synthetic bone graft versus natural bone graft: a comparison study.

PURPOSE: The goal of this study was to determine differences in fracture stability and functional outcome between synthetic bone graft and natural bone graft with internal fixation of tibia plateau metaphyseal defects. METHODS: Hydroxyapatite calcium carbonate synthetic bone graft was utilised in 14 patients (six males and eight females). Allograft/autograft were utilised in the remaining 10 patients (six males and four females). All the 24 patients had clinical, radiological and subjective functional score assessments. RESULTS: There was no significant statistical difference between the groups for post-operative articular reduction, long-term subsidence, and WOMAC scores. The degree of subsidence was not related to age or fracture severity. Maintenance of knee flexion was found to be better in the allograft/autograft group (p = 0.048) when compared between the groups. Multivariate analysis compared graft type, fracture severity, post-operative reduction, subsidence rate, range of movement and WOMAC score. The only finding was a statistical significant association with the graft type related to the 6-month range of movement figures. CONCLUSIONS: Use of autologous or allogenic bone graft allows better recovery of long-term flexion, possibly due to reduced inflammatory response compared with synthetic bone composites. However, all other parameters, such as maintenance of joint reduction and subjective outcome measures were comparable with the use of hydroxyapatite calcium carbonate bone graft. This study shows that synthetic bone graft may be a suitable alternative in fixation of unstable tibia plateau fractures, avoiding risk of disease transmission with allograft and donor site morbidity associated with autograft.

Preoperative estimation of tibial nail length--because size does matter.

INTRODUCTION: Selecting the correct tibial nail length is essential for satisfactory outcomes. Nails that are inserted and are found to be of inappropriate length should be removed. Accurate preoperative nail estimation has the potential to reduce intra-operative errors, operative time and radiation exposure. METHODS: We compared the most commonly used radiological, anthropometric and intra-operative techniques to determine ideal nail lengths for 16 paired cadaveric tibiae. Five different anthropometric measurements were taken from each intact cadaver including: knee joint line to ankle joint line distance (JJD), medial knee joint line to medial malleolus distance (MMD), tibial tuberosity to medial malleolus distance (TMD), olecranon to 5th metacarpal head distance (OMD) and body height (BHR). Each tibia also underwent antero-posterior (AP) and lateral scanograms. Computerised tomography was used to determine the ideal nail length for each tibia. Each anthropometric and radiological measurement was recorded by two orthopaedic surgeons independently. An expert tibial nail was then inserted after nail length estimation was performed using a guidewire technique and an intra-operative radiographic ruler. RESULTS: The AP scanogram was found to be 100% accurate in selecting ideal nail length. The lateral scanogram was also found to be reasonably accurate but in 19% (3/16) of cases it led to a nail being too long. The intra-operative radiographic ruler was found to give a good indication of the ideal nail size, as did the guidewire technique, with only 6% (1/16) of cases producing an incorrect nail size. In general, the anatomical measurements gave a poor indication of ideal nail size compared with the other techniques. The following accuracies were noted: JJD 56%, MMD 50%, TMD 38%, BHR 13% and OMD 56%. CONCLUSIONS: We found that radiological methods such as using an AP radiograph with known magnification and intra-operative radiographic ruler were able to predict nail length very accurately and we suggest that these measurements should be performed routinely. The guidewire technique was also effective but we recommend that it not be used in isolation as errors can occur. We found that anatomical measurements are not accurate for predicting tibial nail length.

Inpatient consultations to an orthopaedic service: the hidden workload.

BACKGROUND: While the quality and efficiency of out-patient orthopaedic referrals are well documented in the literature, there is little on the standard and appropriateness of inpatient orthopaedic consultations. AIM: To prospectively audit the pattern of inpatient consultations to an orthopaedic service. METHODS: Data were prospectively collected on all inpatients referred to the orthopaedic service over a 4-month period. RESULTS: Sixty-eight consultations were received in the study period. The average age was 68 years (range 20-86 years). Seventy-two percent of consultations were from medical services, 25% from other surgical specialties and the remainder (3%) from the psychiatric department. Eight (12%) patients required surgical intervention. Twenty patients (29%) had previously been seen in the outpatient department. CONCLUSIONS: Inpatient orthopaedic consultations generate a significant workload and the majority of such patients could be seen as outpatients. Clear and explicit guidelines on appropriate referral pathways, as well as enhanced education in the management of musculoskeletal disorders and available services may optimise delivery of patient care in the inpatient setting.

A review of the use of common antiplatelet agents in orthopaedic practice.

Antiplatelet agents are widely prescribed for the primary and secondary prevention of cardiovascular events. A common clinical problem facing orthopaedic and trauma surgeons is how to manage patients receiving these agents who require surgery, either electively or following trauma. The dilemma is to balance the risk of increased blood loss if the antiplatelet agents are continued peri-operatively against the risk of coronary artery/stent thrombosis and/or other vascular event if the drugs are stopped. The traditional approach of stopping these medications up to two weeks before surgery appears to pose significant danger to patients and may require review. This paper covers the important aspects regarding the two most commonly prescribed antiplatelet agents, aspirin and clopidogrel.

Dual energy X-ray absorptiometry analysis of peri-prosthetic stress shielding in the Birmingham resurfacing hip replacement.

INTRODUCTION: Numerous reports in the literature refer to the femoral neck fracture rate in hip resurfacing. The aim of this study was to determine the bone mineral density and evidence of stress shielding around the femoral component of the Birmingham resurfacing prosthesis. MATERIAL AND METHODS: Twenty-eight patients with primary unilateral osteoarthritis had a Birmingham resurfacing prosthesis. DEXA analysis of the proximal femur and femoral neck was performed and compared with the opposite unaffected side. RESULTS: Total periprosthetic bone mineral density was 0.49% greater than the control, but this did not achieve statistical significance. Although the BMD of the femoral neck was slightly increased on the prosthetic side (1.002 g/cm2) as opposed to the control side, this difference did not reach statistical significance. CONCLUSION: The Birmingham resurfacing prosthesis does not appear to reduce femoral neck bone mineral density in comparison to the normal femoral neck bone density. We conclude that femoral neck fractures are unlikely to be due to stress shielding related to the prosthesis.

Anthropometrical analysis of cervical spine injuries.

UNLABELLED: To date the principal focus of the mechanism of cervical spine fracture has been directed towards head/neck circumference and vertebral geometric dimensions. However the role of other measurements, including chest circumference and neck length, in a standard cervical fracture population has not yet been studied in detail. Cervical fractures often involve flexion/extension type mechanisms of injury, with the head and cervical spine flexing/extending, using the thorax as an end point of contact. Thus, the thorax may play an important role in neck injuries. STUDY DESIGN: We prospectively studied all patients with cervical spine fractures who were admitted to the National Spinal Injuries Unit from 1 July 2000 to 1 March 2001. Anthropometrical measurement of head circumference, neck circumference, chest circumference, and neck length were analysed. Ages ranged from 18 to 55 years, and all patients with concomitant cervical pathology were excluded from the study. Mechanism of injury involved flexion/extension type injuries in all cases; those with direct axial loading were excluded. A control group of 40 patients (age 18-50 years) involved in high velocity trauma with associated long bone fractures, in whom cervical injury was suspected, but who were without any cervical fracture, or associated pathology, were similarly measured. RESULTS: Our analysis revealed a statistically significant increase in chest size in the male control group versus the male fracture group (97.89 cm versus 94.19 cm, P < 0.05, Student's t-test). There was a correspondingly significant increase in chest circumference between the female controls versus the female fracture group (92.33 cm versus 88.88 cm, P < 0.05, Student's t-test). Our results revealed no statistical difference in head circumference, neck circumference, or neck length between each of the groupings. These results indicate a proportionately larger chest may be a protective factor in cervical spine fractures.