Infected periprosthetic fractures around total hip arthroplasties are increasingly common and extremely challenging problem. The purpose of the study was to review the experience of two tertiary referral units managing infected periprosthetic femoral fractures using interlocking long-stem femoral prostheses either as temporary functional spacers or as definitive implants.

Introduction

In recent years, there has been a significant advancement in our understanding of femoro-acetabular impingement and associated labral and chondral pathology. Surgeons worldwide have demonstrated the successful treatment of these lesions via arthroscopic and open techniques. The aim of this study is to validate a simple and reproducible classification system for acetabular chondral lesions.

Introduction: In recent years, there has been a significant advancement in our understanding of femoro-acetabular impingement and associated labral and chondral pathology. Surgeons worldwide have demonstrated the successful treatment of these lesions via arthroscopic and open techniques. The aim of this study is to validate a simple and reproducible classification system for acetabular chondral lesions.

Methods: In our classification system, the acetabulum is first divided into 6 zones as described by Ilizalithurri VM et al [Arthroscopy 24(5) 534–539]. The cartilage is then graded as 0 to 4 as follows: Grade 0 – normal articular cartilage lesions; Grade 1 softening or wave sign; Grade 2 – cleavage lesion; Grade 3 – delamination and Grade 4 -exposed bone. The site of the lesion is further typed as A, B or C based on whether the lesion is 1/3 distance from acetabular rim to cotyloid fossa, 1/3 to 2/3 distance from acetabular rim to cotyloid fossa and > 2/3 distance from acetabular rim to cotyloid fossa.

For validating the classification system, six surgeons reviewed 14 hip arthroscopy video clips. All surgeons were provided with written explanation of our classification system. Each surgeon then individually graded the cartilage lesion. A single observer then compared results for observer variability using kappa statistics.

Results: We observed a high inter-observer reliability of the classification system with a kappa coefficient of 0.89 (range 0.78 to 0.91) and high intra-observer reliability with a kappa coefficient of 0.91 (range 0.89 to 0.96).

Discussion: In conclusion we have developed a simple reproducible classification system for acetabular cartilage lesions.

Introduction: The radiographic evaluation of the antero-lateral femoral head is an essential tool for the assessment of cam type of femoroacetabular impingement. Computerised tomography (CT), magnetic resonance imaging and frog lateral plain radiograph views have all been suggested as imaging options for this type of lesion. The alpha angle is accepted as a reliable indicator of cam type of impingement and this may also be used as an assessment tool for successful operative correction of the cam lesion. The aim of our study was to analyse the reliability of The frog lateral view plain radiographs to analyse the alpha angle in cam femoroacetabular impingement.

Patients and Methods: Thirty two patients who presented with femoroacetabular impingement were studied. Interobserver reliability for assessment of alpha angles on frog lateral radiographic view was analysed using intraclass correlation coefficient. The alpha angles measured on frog lateral views using digital templating tools were compared to those measured on CT scans.

Results: A high interobserver reliability was noted for the assessment of alpha angles on frog lateral views with a correlation coefficient of 0.83. The average alpha angles measured on frog lateral views was 58.71 degrees (range 32 to 83.3). The average alpha angle measured on CT was 65.11 degrees (range 30 to 102). However, a poor correlation (Spearman r of 0.2) was noted between the measurements using the two systems.

Conclusions: Frog lateral plain radiographs are not reliable predictors of alpha angle. Various factors may be responsible for this such as the projection of the radiographs, patient positioning and quality of images. CT imaging may be necessary for accurate measurement of the alpha angle.

Introduction: Blood transfusion is not uncommon in patients following joint replacement surgery. However, allogeneic transfusion is associated with potential risks ranging from immune mediated allergic reactions to transmission of blood-borne organisms. Furthermore its use has a significant economical impact on healthcare services.

Methods: A retrospective audit of the case notes and haematological records of 196 patients who underwent primary total hip (THR), resurfacing hip (BHR) or total knee replacement (TKR) was carried out. Patients were routinely cross-matched for 2 units of blood if their pre-operative haemoglobin (Hb) levels were < 12g/dL in our cohort. Patient details including age, sex, BMI, comorbidities, and ASA grade were also collected. Surgical parameters such as operation time, tourniquet time (for TKR procedures) and trigger haemoglobin levels (Hb) with timing of transfusion were noted. Statistical analysis was undertaken to identify risk factors for transfusion.

Results: Forty-seven (24%) patients were transfused in our cohort. 78.7% of these patients were appropriately transfused with a trigger Hb of < 8g/dL. Patients transfused with a trigger Hb of > 8g/dL were no different with respect to demographics, procedure type and comorbidities. The average postoperative time interval to transfusion was 2.1 days. Five patients required an intra-operative transfusion. The mean pre-operative Hb levels in transfused and non transfused patients were 12.4 g/dL and 13.5 g/dL respectively. The mean number of units transfused was 2.31. A total of 109 units of blood were used: of these 70 units were cross-matched pre-operatively.

Univariate analysis established a significant relationship between the need for postoperative transfusion and preoperative Hb levels (p< 0.0001), length of surgery (p=0.01), age (p=0.03), history of respiratory disease (p=0.028) and hypertension (p=0.01). There was no significant relationship with respect to ASA grade and procedure type. Multivariate logistic regression analysis revealed pre-operative Hb (p< 0.0001) and age (p=0.015) as the strongest predictors of the need for post-operative transfusion. There is a strong correlation between length of surgery and time interval to transfusion (p=0.037).

Conclusion: Utilisation rates of blood products after primary hip and knee arthroplasty procedures exceed that of what is available from pre-operative cross-matching. In our institution more than 20% of patients may have been transfused inappropriately based upon local guidelines. The decision to cross-match blood pre-operatively for elective arthroplasty procedures should be re-evaluated in light of both patient age and pre-operative Hb levels. Postoperative monitoring of Hb levels should be undertaken early in patients with a prolonged duration of surgery.

Background: Medial plica syndrome is the most common symptomatic plica. The size and shape of the plica have an important impact on impingement on the femoral condyle and hence, symptoms. The validity of the classification systems of such injuries is essential for prospective studies. The study was designed to assess the reproducibility and reliability of Iino and Jee classification systems of medial plica syndrome. The agreement among multiple surgeons for medial plica syndrome has not been established before.

Methods: We validated both classification systems independently from the original authors at our institution. Arthroscopic videos from 30 patients were reviewed by 6 consultant surgeons, 6 registrars and 6 house officers. Intra- and inter-observer reliability and reproducibility were assessed. Each observer scored the videos on two separate occasions and classified the medial plica according to its type (A, B, C and D) for Iino classification and (1, 2, 3 and 4) for Jee classification system.

Results: The results were subjected to weighted kappa analysis. Intra-observer agreements were 0.76 for consultants, 0.64 for registrars and 0.60 for house officers for Iino classification system. They were 0.81 for consultants, 0.75 for registrars and 0.71 for house officers for Jee classification system. Total unanimity (18 observers assigned same grade for medial plica) was achieved in 23% (7 of 30) with Iino system and 40%(12 of 30) for Jee system. Inter-observer agreement was 0.63 for the first reading and 0.68 for the second reading for Iino system. They were 0.72 for the first reading and 0.80 for the second reading for Jee system. Validity analysis showed a kappa value of 0.78 (substantial agreement).

Conclusions: Jee classification system showed a better inter and intra-observer agreement compared to Iino’s system. Consultants had a better intra-observer agreement compared to their registrars. We have shown that substantial agreement can be found between individuals with no specialist training. Such reliability is crucial for multi-centre clinical research studies involving arthroscopic knee surgery. Jee’s classification system did not consider femoral condyle impingment which has an important effect on symptoms. Both systems should be used in prospective studies to evaluate the state of the medial plica.

Radiographic evaluation of the anterolateral femoral head is an essential tool for the assessment of cam type of femoroacetabular impingement. Computerised tomography (CT), magnetic resonance imaging and frog lateral plain radiograph views have all been suggested as imaging options for this type of lesion. Alpha angle is accepted as a reliable indicator of cam type of impingement and this may also be used as an assessment tool for successful operative correction of the cam lesion.

The aim of our study was to analyse the reliability of frog lateral view plain radiographs to analyse the alpha angle in cam femoroacetabular impingement.

Thirty two patients who presented with femoroac-etabular impingement were studied. Interobserver reliability for assessment of alpha angles on frog lateral radiographic view was analysed using intraclass correlation coefficient. The alpha angles measured on frog lateral views using digital templating tools were compared to those measured on CT scans.

A high interobserver reliability was noted for the assessment of alpha angles on frog lateral views with a correlation coefficient of 0.83. The average alpha angles measured on frog lateral views was 58.71 degrees (range 32 to 83.3). The average alpha angle measured on CT was 65.11 degrees (range 30 to 102). However, a poor correlation (Spearman r of 0.2) was noted between the measurements using the two systems.

Frog lateral plain radiographs are not reliable predictors of alpha angle. Various factors may be responsible for this such as the projection of the radiographs, patient positioning and quality of images. CT imaging may be necessary for accurate prediction of alpha angle.

The aim of our study was to determine the usefulness of preoperative digital templating of cementless total hip arthroplasty (THA).

60 consecutive cementless THA (synergy stem & reflection cup) were templated digitally by two senior hip arthroplasty fellows (GM, YG) independently. A metallic marker ball of known diameter was used in all images to help scale for magnification. A blinded observer then collated information on the actual implant sizes, size of head component, offset, and level of neck cut intraoperatively. This was used to statistically analyse the correlation (Interclass correlation coefficient) between the digitally templated implant sizes and actual implant sizes used and the reliability of digital templating.

A high rate of coincidence between digitally templated estimates and actual implant sizes was noted for both groups of templates. A high intraclass correlation coefficient (ICC) for the acetabular cup, stem and head were noted (ICC of 0.825, 0.794, and 0.884 respectively). Moderate agreement was noted for neck cut (ICC of 0.567) and leg length (ICC of 0.612).

In conclusion, digital templating can reliably estimate implant sizes in cementless total hip arthroplasty. Valuable information on neck cut and leg length can be obtained by preoperative templating.

Purpose of study: The diagnosis of meniscal tears is usually based on the patient’s history and on specific physical tests. Magnetic resonance imaging (MRI) and arthroscopy is often necessary for diagnosis.

Theofilos Karachalios et al. described the new ‘Thessaly test’ and concluded that it could be safely used as a first line screening test for the selection of patients who need arthroscopic meniscal surgery (Ref: J Bone Joint Surg Am. 2005 May; 87(5):955–62). Our objective was to study the role of physical diagnostic tests in screening for meniscal tears and to validate the diagnostic accuracy of the Thessaly test.

Methods & Results: We examined 109 patients [(80 male, 29 female), average age 39.11 years, range (16–66)] who presented with a history suggestive of a meniscal tear. Joint line tenderness,

McMurray’s test and the Thessaly test were assessed by an independent investigator blinded to any imaging data in all patients. MRI and subsequent arthroscopy results were then collated.

Our study showed a much lower diagnostic accuracy for the Thessaly test (61.25 % for medial meniscus and 80 % for lateral meniscus) It is comparable to McMurray’s test (57.14 % for medial meniscus and 77.38 % for lateral meniscus). The Joint line tenderness test has a far superior diagnostic accuracy (80.95 %for medial meniscus and 90.48 % for lateral meniscus). Combining the joint line tenderness test with McMurrays test or the Thessaly test further increased the diagnostic accuracy. Magnetic resonance imaging (MRI) detected 96% of meniscal tears. Arthroscopy was diagnostic and therapeutic in all cases.

Conclusion: Physical tests may not always be diagnostic of meniscal tears. MRI and arthroscopy may be essential in dubious clinical presentations. In our study the Thessaly test in isolation did not have the highest diagnostic accuracy for the detection of meniscal tears but helps increase diagnostic certainty when combined with standard tests.

The aim of the study is to compare the postoperative pain relief provided by continuous perfusion of wound by bupivacaine and fentanyl with that of patient controlled analgesia using morphine in elective shoulder surgery. This retrospective case control study included 76 consecutive patients who had elective shoulder surgery. 39 patients had patient controlled analgesic system (PCA) with morphine and 37 patients had a continuous wound perfusion(intra bursal) with bupivacaine and fentanyl via a disposable Silicone Balloon Infuser. Patients were also given additional oral NSAIDs or morphine if needed. The pain score measured postoperatively based on a 10 point Visual Analogue Scale (VAS) at 1, 2, 3 and 18 hours was noted. The use of antiemetics and additional painkillers was recorded. The complications of both methods were also noted.

We found that the analgesia provided by continuous perfusion of wound by bupivacaine and fentanyl was constant and comparable to that provided by the patient controlled analgesic system using morphine. PCA with morphine was associated with significantly high incidence of nausea and vomiting (p < 0.001).We conclude that continuous perfusion of the wound by bupivacaine and fentanyl appears to be a simple, effective and safe method of providing analgesia following elective shoulder surgery.

MRI scan for the knee joint has often been regarded to be the non invasive alternative to a diagnostic arthroscopy. MRI scan is routinely used to support the diagnosis for meniscal or ACL injuries prior to recommending arthroscopic examination and surgery. Identification of meniscal tears can be difficult to interpret and can be observer dependent as well as dependent upon the sensitivity of the scanner. Similar difficulties may exists in clinical examination as well.

Our aim was to compare and correlate clinical, MRI and arthroscopic findings in the diagnosis of meniscal and Anterior Cruciate Ligament (ACL) Injuries.

This was an observational study of 131 patients over 36 months who had both MRI and arthroscopic surgery.

Our study showed clinical examination had better sensitivity (0.86 vs 0.76)and specificity(0.73 v/s 0.52) in comparing to MRI in diagnosis of medial menisceal injuries. similarly +predictive value and −predictive value were higher for clinical examination. whereas for lateral menisceal and ACL injuries there were marginal differences in sensitivity, specificity and predictive values

We conclude that carefully performed clinically examination can give equally or better diagnosis of meniscal and ACL injuries in comparison to MRI scan.

MRI scan may be used to rule out such injuries rather than to diagnose them. MRI scan has much better negative predictive value than positive predictive value in both meniscal and ACL injuries diagnosis. When clinical signs and symptoms are inconclusive, performing MRI scan is likely to be more beneficial in avoiding unnecessary arthroscopic surgery.

When clinical diagnosis is in favour of either meniscal or ACL injuries, performing MRI scan prior to Arthroscopic examination is unlikely to be of significance. MRI scan should not be used as a primary diagnostic tool in meniscal and ACL injuries

Introduction: The incidence of post-operative peri-prosthetic fractures is increasing. This is a consequence of the larger number of revision cases being undertaken, the increase in the use of cementless implants and a number of patients who develop undetected osteolysis as a result of poor follow up. The Vancouver classification has been shown to be a valid and reliable method for determining the configuration of periprosthetic fractures. This is essential in directing the further management of periprosthetic fractures appropriately.

Methods: We have revalidated this classification system independently from the original authors at our institution. The radiographs from 30 patients with peri-prosthetic fractures were reviewed by 6 expert consultant surgeons, 6 non-experts at registrar level and 6 medical students, who had received no specialist training in this area, in order to assess intra and inter-observer reliability and reproducibility. Each observer read the radiographs on 2 separate occasions and classified the fracture according to its type (A, B1, B2, B3, and C).

Results: The results were subjected to weighted κ analysis and were: Intraobserver agreement 0.72 for experts,0.68 for non experts and 0.61 for medical students. Interobserver agreement was 0.63 for the first reading and 0.67 for the second reading. Validity analysis showed a κ value of 0.79 (substantial agreement).

Discussion: Our results confirm the reliability and reproducibility of this classification system. In addition we have shown that substantial agreement can even be found between individuals with no specialist training. This is a classification system that can be used by non-experts, between centres and across continents.