Predictors of mortality following shoulder arthroplasty.

INTRODUCTION: This study aims to determine 30-day, 90-day and 1 year mortality following shoulder arthroplasty and identify predictors of mortality. MATERIALS AND METHODS: All shoulder arthroplasty cases performed at the host institution, between 2012 and 2018 were included. A review of patient records was completed to identify demographic data, Charlson comorbidity index, date of death and factors associated with mortality.Mortality analysis was undertaken using 1-Kaplan Meier estimates with 95% confidence intervals. Comparative analysis was performed for mortality following shoulder arthroplasty for elective vs. trauma and for primary vs. revision surgery. A multiple regression analysis was conducted to determine which factors were associated with increased mortality risk. RESULTS: 640 shoulder arthroplasty cases were performed in 566 patients. There were 44 deaths, 1 occurred within 90 days and 13 within 1 year. Trauma procedures had a hazard ratio of 5.3 (95% CI 1.9 to 15.0) for mortality compared to elective procedures (5 year survival trauma 78.6% (95% CI 60.7 to 89.0); elective 91.8% (95% CI 88.1 to 94.4). 1-year mortality was predicted by presence of malignancy, liver failure, cardiac failure, peptic ulcer, trauma surgery, revision surgery, intra-operative complication, transfusion and increased length of stay. DISCUSSION: 30-day, 90-day and 1-year mortality following shoulder arthroplasty were 0%, 0.16% and 2%; trauma procedures had a hazard ratio of 5.3 for 1-year mortality when compared to elective surgery. Malignancy, cardiac failure, liver failure, peptic ulcer and trauma surgery are associated with an increased risk of 1-year mortality.

Predictors of length of stay following shoulder arthroplasty in a high-volume UK centre.

INTRODUCTION: Shoulder arthroplasty rates are increasing in the UK. No data have been published from a UK centre on predictors of length of inpatient stay following shoulder arthroplasty. This study analyses the length of inpatient stay following shoulder arthroplasty in a high-volume UK centre and identifies predictors of prolonged inpatient stay. MATERIALS AND METHODS: All shoulder arthroplasty cases performed between 2012 and 2018 were identified. A review of case notes and electronic patient records was completed to identify demographic data, Charlson comorbidity score, length of inpatient stay and factors associated with length of stay. Multiple linear regression analysis was conducted to determine which factors were independently associated with length of inpatient stay. RESULTS: A total of 640 shoulder arthroplasty cases were performed in 566 patients. Median length of stay was two days. Length of stay was predicted by age, sex, chronic kidney disease, congestive cardiac failure, previous myocardial infarction, intraoperative complication and postoperative transfusion. DISCUSSION: Increasing age, female sex, chronic kidney disease, congestive cardiac failure, previous myocardial infarction, intraoperative complication and transfusion were independent predictors of increased length of stay. Strategies to reduce perioperative complication and transfusion, and to optimise renal and cardiac comorbidities may reduce overall length of stay for shoulder arthroplasty patients.

Blood transfusion rates following shoulder arthroplasty in a high volume UK centre and analysis of risk factors associated with transfusion.

AIMS: To determine the blood transfusion rates following shoulder arthroplasty and to establish risk factors associated with increased risk of transfusion. MATERIALS AND METHODS: All shoulder arthroplasty cases performed between January 2012 and March 2017 in a tertiary upper limb unit were identified. Patients who received perioperative tranexamic acid were excluded. Retrospective review of case notes was completed to identify transfusion rate and risk factors. Univariate and multivariate analysis were performed to analyse the association between risk factors and transfusion rate. RESULTS: Five hundred and thirty-seven shoulder arthroplasties performed in 474 patients were included. Peri- or post-operative transfusion was required in 21 cases (3.9%). Univariate analysis suggested significant association with age (p = 0.005), female sex (0.015), preoperative haemoglobin/haematocrit (p < 0.001), perioperative drop in haemoglobin (p < 0.001), ASA grade (p < 0.001) and transfusion rate. Only perioperative drop in haemoglobin (p < 0.001) and American Society of Anaesthesiologist score (ASA) grade (p = 0.039) retained significance on multivariable analysis. CONCLUSIONS: The blood transfusion rate following shoulder arthroplasty was 3.9%. Greater perioperative drop in haemoglobin and higher ASA grade were associated with increased risk of transfusion on multivariate analysis.

Reverse geometry shoulder replacement for proximal humeral metastases.

The management of skeletal metastases can be challenging for the orthopaedic surgeon. They represent a significant source of pain and disability for cancer patients, adding to the morbidity of their condition. Treatment is directed at the alleviation of symptoms and the restoration of function. Metastatic involvement of the proximal humerus can be especially debilitating, having the potential to cause severe pain and loss of function. We present a report of three such cases where reverse geometry proximal shoulder replacement was used to provide a pain free functional range of movement in patients with concomitant rotator cuff disease. In all cases, significant symptomatic relief was achieved postoperatively with preservation of upper limb function. No surgical complications were noted. It is our belief that this novel surgical strategy provides a valuable and effective option for the management of proximal humeral metastatic disease in the rotator cuff deficient patient.

Laproscopic management of wandering biliary ascariasis.

Ascariasis is one of the most common helminthic diseases in humans, occurring mostly in countries with low standards of public health and hygiene, thereby making ascariasis highly endemic in developing countries. In endemic areas, 30% of adults and 60-70% of children harbour the adult worm. Biliary ascariasis is a rare cause of obstructive jaundice. Conventional management involves endoscopic extraction of worm. We are reporting a rare case of ascaris which induced extrahepatic biliary obstruction in a young male who presented with acute cholangitis. The ascaris was removed by laparoscopic exploration of the common bile duct. Postoperative period was uneventful.

Shoulder arthroplasty. Part 1: Prosthesis terminology and classification.

Shoulder arthroplasty is the third most common joint replacement procedure in the UK, and there are a number of different implant options available to surgeons to treat a variety of shoulder disorders. With an increasing burden placed on clinical follow-up, more patients are remaining under the care of their general practitioners and musculoskeletal triage assessment services and are not necessarily being seen by specialists. Referrals to orthopaedic specialists are therefore often prompted by radiological reports describing evidence of implant failure. This article is the first of two reviews on shoulder arthroplasty, concentrating on implant features and the indications for their use. The second article will address the modes of failure of shoulder arthroplasty and describe the relevant associated radiological features.

Shoulder arthroplasty. Part 2: normal and abnormal radiographic findings.

Frequently, the decision made by general practitioners or musculoskeletal triage assessment services to refer patients for specialist review is initiated by a radiological report. Following shoulder arthroplasty it is important to ensure that any patient with asymptomatic evidence of a failing prosthesis is referred for review so that revision surgery can be contemplated and planned before the situation becomes unsalvageable. The first paper in this series described the various types of shoulder arthroplasty and indications for each. This follow-up paper will concentrate on their modes of failure and the associated radiographic features, and is aimed at radiology trainees and non-musculoskeletal specialist radiologists.

Upper limb deep vein thrombosis: a potentially fatal complication of a clavicle fracture.

We present a case a 48-year-old man who was diagnosed with an upper limb deep vein thrombosis post clavicle fracture. He was successfully investigated with a computed tomography (CT) venogram, thrombophilia was excluded, and he was subsequently treated with a 3-month course of anticoagulation. We illustrate this case with photographs and a three-dimensional colour reconstruction of a CT venogram to raise awareness of the condition. A suitable level of clinical suspicion should be maintained by the orthopaedic surgeon; delayed arm swelling with venous congestion following a clavicle fracture should be investigated with CT venography and thrombophilia should be excluded.

Propagation of stress fracture of the patella.

Anterior knee pain in athletes is common and usually self limited. There should be a high index of suspicion and low threshold for special imaging in cases with acute onset and specific tenderness. The risk of propagation of stress fracture of the patella in athletes is highlighted. The case report presented illustrates the potential sequence of events.

Cementless acetabular replacement in patients with rheumatoid arthritis: a 6- to 14-year prospective study.

Sixty-three consecutive patients who had 82 Harris-Galante porous acetabular cups (HGP1) (Zimmer Inc, Warsaw, IN) implanted for the treatment of rheumatoid arthritis were prospectively assessed since 1986. At last examination, 12 patients (16 hips) had died, and 1 patient (1 hip) was lost to follow-up. A total of 65 hips in 50 patients were available for the latest review. The follow-up period was 6.8 years to 14 years (mean, 9.1 years). There had been 6 revisions: 1 for deep infection and 5 for polyethylene cup wear. Survivorship analysis for all failures estimated that 75% of hips would still be revision-free after 4558 days (12.5 years). Polyethylene wear has been identified in a further 7 cases at last examination. The average linear cup wear per year was 0.05 mm(range, 0.00-0.66 mm). There were no cases of acetabular loosening or acetabular migration. These results demonstrate the excellent durability of fixation of the HGP1 cups in patients with rheumatoid arthritis. However, a 32-mm head should probably not be used with this cup given the high associated incidence of polyethylene wear.

Fractures involving splitting of the humeral head.

Splitting fractures of the humeral head are rare; part of the humeral head dislocates and the unfractured part remains attached to the shaft. We report eight cases in young patients. In five the diagnosis was made at presentation: three had minimal internal fixation using a superior subacromial approach, one had a closed reduction and one a primary prosthetic replacement. All five patients regained excellent function with no avascular necrosis at two years. In three the injury was initially unrecognised; two developed a painless bony ankylosis and one is awaiting hemiarthroplasty. It is important to obtain the three trauma radiographic views to diagnose these unusual fractures reliably. CT delineates the configuration of the fracture. In young patients open reduction and internal fixation seems preferable to replacement of the humeral head, since we have shown that the head is potentially viable.

Soil biochemical activity and growth response of rice Oryza sativa in flyash amended soil.

Soil amended with different proportions of flyash, a solid waste generated from coal-fired thermal power plants, was evaluated as a soil conditioner and nutrient supplement during a field study on the growth of rice, Oryza sativa. Generally, pH and organic carbon (OC) content did not increase significantly (P > 0.05) in flyash amended soil, but significant increases (P < 0.05) in soil conductivity (32%), available phosphorus (48%) and organic matter (OM, 29%) were observed during harvest at the 20 t ha-1 flyash application rate. Amylase, invertase, dehydrogenase and protease activities, and CO2 evolution increased in flyash amended soil over the control. The pigment (chl-a, chl-b, and carotenoid) content in rice plants did not vary significantly (P > 0.05) between different flyash amendments. Total plants biomass and aboveground biomass increased (P < 0.05) significantly (17% and 25%, respectively) at the 20 t ha-1 flyash application. However, there was a retarded growth of underground biomass. Grain and straw yield increased by 21% and 18%, respectively, at 17.5 t ha-1 flyash amendment when compared to the control. Although, a significant increase (P < 0.05) in plant biomass and grain yield in flyash amended soil is encouraging from the point of waste disposal and management, elucidation of reasons for retarded growth in underground biomass will require additional research based on long-term studies.

Severe varus and valgus deformities treated by total knee arthroplasty.

We report a prospective case-controlled study which compared the outcome of knee replacement in seriously deformed and slightly deformed knees. There were 51 knees with varus or valgus deformity greater than 20 degrees matched for age, gender, disease, type of prosthesis and time of operation with a control group in which the alignment of the leg was within 5 degrees of normal. The clinical outcome at a mean 5.5 years was similar in the two groups. Some deformity persisted in 14 patients in the first group, 13 of whom were initially in valgus. These patients had a significantly poorer mean clinical outcome. Lateral dislocation or subluxation of the patella was found in four knees, all of which had had valgus deformity of 30 degrees or more.

Revision total knee arthroplasty. Comparison of outcome following primary proximal tibial osteotomy or unicompartmental arthroplasty.

Forty-three patients who had undergone revision total knee arthroplasty following either primary, medial unicondylar arthroplasty (23 patients) or valgus tibial osteotomy (20 patients) for medial compartment osteoarthritis were reviewed. Although the two groups had similar knee scores and range of motion at review, six patients (30%) who had undergone prior tibial osteotomy suffered serious postoperative complications. Of these, four patients had a deep infection. It was felt that several factors were responsible, resulting largely from difficulties in gaining access to the lateral tibial plateau and subsequently causing impairment of wound vascularity and healing. In contrast, those patients undergoing revision of unicondylar prostheses did not experience wound healing problems, but it was noted that in half of the cases, there was significant bone loss from the medial tibial plateau.

[Patterns of failed internal unicompartmental knee prostheses, allowing persistence of undercorrection]. / Modes de détérioration des prothèses unicompartimentales internes du genou laissant persister une hypocorrection.

THE PURPOSE OF THIS STUDY: was to investigate how deliberate slight undercorrection of varus deformities influenced the patterns of failure seen following medial unicompartmental knee replacements. METHODS: Between 1980 and 1989, 335 medial unicompartmental knee replacements were performed using the St George Sled prosthesis. The replacements were preformed so that the postoperative mechanical axis, as defined as the line joining the centre of the femoral head to the centre of the talus, passed medial to the centre of the knee joint and through the replaced medial compartment. The mean follow-up for these patients was 6.4 years (range of 2 to 12). By 1992, 33 of these cases had required revision. The radiographs and case notes of cases were available for study. RESULTS: There were no significant differences in the demographic details between those coming to revision and the successful group. Analysis of the post-operative alignments in the successful group revealed that the desired undercorrection was achieved in 73 per cent of cases. 2 per cent were left grossly undercorrected with their mechanical axis passing medially outside the medial compartment. In 20 per cent of cases the mechanical axis was almost fully restored passing through the centre of the knee. 4 per cent of cases had an overcorrection with the mechanical axis passing through the lateral compartment. Early failures (N = 11), classified as those cases in whom satisfactory result were never obtained, were primarily due to poor patient selection or to gross technical errors at surgery. Late failures (N = 22) were those that required revision for symptomatic failure after an initially successful primary arthroplasty and were due to progressive disease (N = 6), prosthetic failure (N = 22) were those that required revision for symptomatic failure after an initially successful primary arthroplasty and were due to progressive disease (N = 6), prosthetic failure (N = 10) and recurrent medial pain (N = 6). DISCUSSION: Patients who otherwise meet the criteria for medial unicompartmental replacement, usually have a mild degree of osteoarthritis in the lateral compartment. Suddenly loading the lateral compartment, by fully correcting a varus deformity, could accelerate the degenerative process in this compartment. Progressive disease in the lateral compartment was seen in only 4 cases in our series. In 6 patients failure was associated with recurrent medial medial joint pain with increasing varus deformity. In these cases the mechanism of failure was probably the result of an excessive medial load from a gross undercorrection of the mechanical axis which passed close to or outside the medial aspect of the knee. The crude revision rate for our series with an average follow-up of 6.4 years was 10 per cent. After excluding the early failures, which resulted largely from the potentially avoidable problems the revision rate was 6.7 per cent. CONCLUSIONS: The results from this series suggest that slight undercorrection of varus deformities does not produce any significant differences in the revision rates for unicompartmental replacements when compared to previous reports. Slight undercorrection would appear, nevertheless, to effect the relative importance of the modes of failure seen. Most notably there are fewer failures from disease in the lateral compartment. This potential advantage, however, is somewhat offset by failures from excessive loading of the medial compartment as technical errors at surgery may result in gross undercorrection of the mechanical axis.

Algodystrophy and osteoporosis after tibial fractures.

We made a prospective study of the incidence and natural history of algodystrophy and associated changes in bone mineral density in the ankles and feet of 60 consecutive patients who had suffered unilateral fractures of the tibial shaft. At bone union, 18 patients showed signs of algodystrophy. Its development was independent of the type of fracture management and of the severity of injury. Patients with algodystrophy lost significantly more bone mineral than did those without but the degree of this loss was independent of the type of treatment and of the time to fracture union. In most cases the symptoms resolved within six months of fracture union but in four patients they were still present at one year and two of these had not returned to work.

Posterior tibial nerve palsy after intramedullary nailing.

Three cases of posterior tibial nerve palsy following reamed intramedullary nailing of the tibia are presented. This is a rare complication causing considerable morbidity. The possible mechanisms of neural injury are reviewed and guidelines for prevention are outlined.