Abstract

Aims

The aim of this study is to determine the effects of the UK lockdown during the COVID-19 pandemic on the orthopaedic admissions, operations, training opportunities, and theatre efficiency in a large district general hospital.

Aims

The purpose of our study was three fold; firstly to assess the survival of closing wedge high tibial osteotomies (CWHTO), secondly to assess any clinical factors or radiological alignment which may affect survival and thirdly to assess the change in tibial inclination and patella height.

Idiopathic anterior knee pain (AKP) is common in adolescents and young adults. Most believe that the origin of the problem lies in the patello-femoral joint. Hamstring tightness has also been attributed as an important cause.

The aim of our study was to compare biometric parameters in patients with idiopathic AKP and controls. We also wanted to assess whether there was a difference in the relative electromyographic (EMG) onset times of the medial and lateral hamstrings.

We prospectively recruited patients with idiopathic anterior knee pain in the age group 11 to 25. Patients, but not the control population, had AP, lateral and skyline radiographs taken to rule out other pathology.

We had 34 patients (60 knees) with a minimum one year follow up. There was no difference in the symptoms of patients who attended physiotherapy as compared to those who did not. Patients with knee pain had significantly more hip external rotation (63 deg) as compared to the control (47 deg) group (p=0.001). Patients also had significantly more hamstring tightness (p=0.04).

Surface EMG was recorded (17 patients and controls each) from the medial and lateral hamstrings during 3 repetitions of a maximal voluntary isometric contraction exercise with the knee at 45° of flexion. The lateral hamstrings contracted 48.7 m.sec earlier than the medial hamstrings in patients as compared to controls.

AKP is a multifactorial and self-limiting disorder. Earlier contraction of the lateral hamstrings may cause tibial external rotation and contribute to the symptoms. Our data suggests that physiotherapy did not significantly alter the course of the condition. We believe that increased hip external rotation may contribute to the symptoms by increasing medial facet stress.

Introduction: NICE guidelines (2000) stipulated three-year follow-up data compatible with satisfactory performance at 10 years as a minimum requirement for hip implants. We reviewed the performance of two devices in use in our department which fell outside these requirements. The Cenator cup (Corin Medical) is a cemented device, and the EPF cup (Plus Orthopedics) is uncemented (equatorially expanded, screw option, polished inside, porous HA coated).

Patients and Methods: 117 Cenator and 110 EPF cups inserted during the period 12/09/2000–28/01/2003 were assessed at 3 years by the following: Oxford Hip Score, satisfaction (visual analogue scale), details of femoral component, age, sex, BMI and any complications. Radiological assessment included Charnley Grade, concentricity, superior cover, cup inclination, migration, radiolucent lines, and linear wear at 3 years. Statistical associations with radiolucent lines or linear wear were calculated.

Results: The mean age of patients with Cenator cups was 81 (range 61–102) and EPF cups 67 (39–86). Oxford Hip Scores averaged 10 (0–41)(Cenator) and 7 (0–29)(EPF). Cup inclination range was 30–65° (mean 47). Linear wear > 1mm was observed in 18 Cenator and 53 EPF cups. Early radiolucent lines behind EPF cups closed (all cases), and superior cover improved in 8%. Progressive radiolucencies > 1mm were seen behind 37 Cenator cups. One of each type was revised for deep sepsis. Four other minor reoperations occurred. Statistical association was demonstrated between superior cover and progressive radiolucencies (Cenator), and between sex, cup size and inclination and linear wear (EPF).

Discussion: Crucial markers of prognosis were observed (progressive radiolucencies and linear wear) but survivorship at three years for aseptic loosening was 100%. Our results indicate satisfactory performance at three years in accordance with NICE guidelines, and suggest acceptability of both devices. Our methods may be applicable to similar implants currently in use but not yet endorsed by suitable published outcome data.

Introduction: Poor proprioception and imbalance between quadriceps and hamstrings have been suggested as causes for anterior knee pain. The aim of our study was to compare the proprioception of patients with anterior knee pain to a normal population and to compare the activity of quadriceps and hamstrings using electromyography (EMG) in the 2 groups.

Methods: Patients and controls between the ages 11–25 yrs were recruited into the study. The proprioception (stability index) of the patients and controls was tested using the Biodex stability system. This computerised system tests the ability of a person to balance his/her own body on a platform that moves in various directions. Surface EMG was recorded from the quadriceps and hamstrings during this test. EMG was also recorded as the patients and controls stepped onto a 20cm step. EMG activity was normalised to levels elicited during maximal isometric contractions.

Results: 18 patients and 27 controls were recruited.

We found no significant difference between the groups in the EMG intensity of vastus lateralis relative to biceps femoris, or vastus medialis relative to vastus lateralis, during the balance test or during the step up task (Mann Whitney U test all p> 0.05). We did not find any difference in the proprioceptive abilities of the two groups

Conclusion: We found no significant difference between the groups in the intensity of muscle contraction of the hamstrings relative to the quadriceps, i.e. no evidence for an imbalance in the patients. However the temporal relation between the two needs further investigation.

The purpose of this study was to determine the effect of the use of a system to retransfuse salvaged drainage blood in patients undergoing primary THR with the aim of avoiding the significant risks that allogeneic blood transfusion poses to the patient. This was a retrospective cohort study where records of 109 patients undergoing elective THR following the introduction of an autologous retransfusion system at the institution were compared with a cohort of similar patients who underwent the same procedure prior to the introduction of the autologous system. The two groups were matched for age, surgeon, approach and technique and the results were subjected to statistical analysis. The use of a system to retransfuse postoperative salvage drainage blood, without concomitant use of predonation or intraoperative blood salvage, significantly reduced the need for allogeneic blood transfusion from 30% to 9%(p< 0.001). Patients who received salvaged blood also had a significantly smaller haemoglobin drop (Difference 0.56g/dL p=0.001) in the perioperative period, even though the preoperative haemoglobin level was not significantly different in the two cohorts. The overall cost of using the retransfusion system was similar to that of routine vacuum drainage when the savings of reduced allogeneic blood transfusion were considered. In conclusion the retransfusion of postoperative salvage drainage blood is a simple, effective and economical way of providing autologous blood for patients undergoing primary THR

Aims: Limb sparing surgery, for selected cases of long bone primary malignancy, may be accomplished with the use of large prostheses. Conventional joint implants are known to release metal ions by corrosion or wear. The aim of this study was to determine if a specialist group of patients had elevated serum metal levels. Methods: Over a 12 month period, 20 patients who had undergone previous surgery were recruited from a bone tumour clinic. A 10ml venous blood sample was obtained and analysed for trace metals using a previously published mass-spectrometry technique. Results: Eight children (mean age 14.5 years) and 12 adults (mean age 46.5 years) were recruited a mean of 54 months and 86 months following surgery, respectively. Trace metal (aluminium, titanium, cobalt) elevation was observed in 5/8 (63%) paediatric cases and 6/12 (50%) adult cases. Three of the adults had signiþcantly raised levels, (≤ 50 times), and had undergone revision surgery for loosening. There was no observed implant loosening in the paediatric group. Conclusions: This small sample has demonstrated that many patients with long-term large tumour implants have trace metal levels below laboratory detection. Signiþcant elevation of metal levels in adults was associated with loosening or wear of implants. A signiþcant proportion of paediatric cases had slight elevations, but the signiþcance of this is unknown at present.