One of the main surgical goals when performing a total knee replacement (TKR) is to ensure the implants are properly aligned and correctly sized; however, understanding the effect of alignment and rotation on the biomechanics of the knee during functional activities is limited. Cardiff University has unique access to a group of local patients who have relatively high frequency of poor alignment, and early failure. This provides a rare insight into how malalignment of TKR's can affect patients from a clinical and biomechanical point of view to determine how to best align a TKR. This study aims to explore relationship clinical surgical measurements of Implant alignment with in-vivo joint kinematics.

28 patient volunteers (with 32 Kinemax (Stryker) TKR's were recruited. Patients undertook single plane video fluoroscopy of the knee during a step-up and step-down task to determine TKR in-vivo kinematics and centre of rotation (COR). Joint Track image registration software (University of Florida, USA) was used to match CAD models of the implant to the x-ray images. Hip-Knee-Ankle (HKA) was measured using long-leg radiographs to determine frontal plane alignment.

Posterior tibial slope angle was calculated using radiographs. An independent sample t-test was used to explore differences between neutral (HKA:-2° to 2°), varus (≥2°) and valgus alignment (≤-2°) groups. Other measures were explored across the whole cohort using Pearson's correlations (SPSS V23).

There was found to be no statistical difference between groups or correlations for HKA. The exploratory analysis found that tibial slope correlated with Superior/Inferior translation ROM during step up (r=−0.601, p<0.001) and step down (r=−.512, p=0.03) the position of the COR heading towards the lateral (r=−.479, p=0.006) during step down.

Initial results suggest no relationship between frontal plane alignment and in-vivo. Exploratory analyses have found other relationships that are worthy of further research and may be important in optimizing function.

The diagnosis of periprosthetic joint infection may be difficult with patients presenting months or years after initial surgery with surgery-associated or haematogenously spread bacteria. Synovasure™ is a new point of care assay that measures alpha defensin produced by activated leucocytes in joints; it is licensed for the diagnosis of periprosthetic joint infections. We sought to include alpha defensin testing in a testing algorithm to improve the diagnosis of periprosthetic joint infection.

An algorithm for testing patients with suspected periprosthetic joint infection was developed and agreed among knee surgeons in Gloucestershire, UK. Data was prospectively collected on all tests performed along with information on how the results of the alpha defensin test altered patient management.

A sample of joint fluid was taken using aseptic technique in theatre and tested for alpha defensin production at the point of care. Samples were then referred for standard culture and selected samples for 16SrRNA PCR.

12 patients were assayed for alpha defensin in periprosthetic joint fluid during 2015. 7 patients were female, 5 male and ages ranged 64–86 years. 10 patients had a negative point of care alpha defensin test. Only 2 of these patients also had a leukeocyte esterase (LE) test performed and these were negative. The culture results from all samples were negative for both direct and enrichment cultures. 3 samples also had 16SrRNA PCR performed and these were negative.

2 patient samples tested positive for alpha defensin. LE tests were not performed. Both samples were culture negative on direct and enrichment culture however both samples were also referred for 16SrRNA PCR which detected DNA compatible with Staphylococcus caprae/capitis/ saccharolyticus/epidermidis from 1 patient and DNA with homology to Streptococcus gallolyticus/equinusI for the other.

Alpha defensin testing improved the diagnosis of prosthetic joint infection. A positive alpha defensin test may be used to select patients for whom 16SrRNA PCR testing is useful in order to maximise the potential for pre-revision infection diagnosis and the planning of appropriate adjuncts such as antibiotic laden cement or calcium sulphate beads. Negative alpha defensin tests on aspirated joint fluid may avoid the need for arthroscopy and biopsy and allow planning for single stage revision surgery without concern for infection.

Aims

Wales in collaboration with the Welsh Assembly Government, has attempted to start a national ligament register.

Purpose

To review the Five year survivorship of Kinnemax TKA performed at the NHS Treatment Cantre, Weston-Super-Mare (WSM), and compare it to a similar cohort from our institution.

Introduction: Distal third fractures of the clavicle account for approximately 10–15% of clavicle fractures. Non union rates following conservative management can be as high as 30%. Many techniques have been described, including external fixation, k-wire fixation, and most recently, hook plate fixation. Non-absorbable sutures, and slings have also been utilised. All of these techniques are associated with complications. In addition, Hook plates require a second operation to remove the plate. This study reports the results of a simple technique using a PDS loop in the fixation of Neer type 2 fractures of the clavicle, performed in our institution.

Methods: Twelve patients with Neer type 2 fractures operated by a single surgeon over three years were included in the study. The mean age was 45 (14 to 63). There were 7 male and 5 female patients. Standard postoperative protocols were followed in all patients. A 1.5 PDS cord looped around the coracoid was used to hold the reduced medial clavicular shaft fragment. Patients were followed up postoperatively at two, six and twelve weeks. Final outcomes were assessed using radiographs and the Oxford and DASH scoring systems at twelve months.

Results: Ten fractures united within twelve weeks. All of these patients returned to their pre-injury activity level. There were two non unions, both in non compliant patients. One of these non unions remained asymptomatic and one patient was lost to follow up. The mean Oxford score at 12 months was 14.25 (range 12 to 16) and the mean DASH score was 5 (4–7).

Conclusion: We conclude that this technique is safe, simple and cost effective. It achieves high rates of union without the need for implant removal. As with other techniques, proper patient selection is essential. We recommend this technique as an excellent treatment option when dealing with these notoriously difficult fractures.

This study aims to evaluate the accuracy of sheer off self limiting screw drivers and to assess repeatability with age.

It has been reported that overzealous tightening of halo pins is associated with co-morbidity. Our unit has recently received a tertiary referral where the patient over tightened a pin leading to intracranial haematoma, hence our interest in this subject. The torque produced by six new and nine old screw drivers was tested using an Avery Torque Gauge and a Picotech data recorder. These devices are designed to produce a torque of 0.68 Nm, any greater than this is potentially hazardous. Accepted error for each device was +/− 10%. The average torque produced by the new screw drivers was 0.56 Nm with a range of 0.35–0.64 Nm (SD 0.120). The older screw drivers produced an average torque of 0.67 Nm ranging from 0.52–0.85 Nm (SD 0.123).

In conclusion, sheer off self limiting screw drivers are not accurate devices. The older devices are more likely to produce a torque exceeding a safe range and therefore we would recommend the use of new devices only.

Ethics approval: none audit.

Interest statement: none local grant.

Aim: To evaluate the effectiveness of all inside meniscal repair technique in treating bucket handle tears of the meniscus in the athletic population.

Method: From 2005–2008, 40 patients underwent meniscal repair for bucket handle tear of the meniscus, either as a primary procedure or combined with ACL reconstruction. All patients were contacted by clinical review, letter or telephone retrospectively. All patients were scored using the Tegner Knee score. All patients had been participating in sport at international level, semi professional level or club level. Failure was defined as a recurrence in symptoms necessitating reoperation and success as a return to competitive sport.

Results: There were 27 medial meniscal tears and 13 lateral, in 38 knees. The average age was 23 years (16–39). The average length of follow up was 1.5 years (0–2–3.1) years, and the average time from injury to surgery was 47 weeks. 9 patients were treated with fast fix (Smith and Nephew Endoscopy) and 31 Rapidloc (DePuy Mitek). There was an average of 2.85 sutures used. The overall cumulative survival rate at two years was 83.9% (4 Failures). All reoperations were preceded by a subsequent traumatic event to the knee resulting in a recurrence of symptoms. Time to return to sport in patients with associated ACL reconstruction was not affected by conincidental meniscal repair. Of the primary meniscal repairs the time to return to previous sport was less than 4 months.

Conclusion: This study shows that meniscal repair has a high success rate for sporting individuals with meniscal tears and has a high chance of the individual returning to competitive sports.

Following introduction of the second offer scheme in April 2004, Cardiff and Vale NHS Trust sent 227 patients (254 knees) to the independent sector treatment centre in Weston-Super-Mare for total knee arthroplasty. The Kinemax total knee system was used in all cases.

There was a perception that there were a large number of dissatisfied patients, and a previous British Orthopaedic Association report (of a 14 case sample) questioned the quality of the surgery performed.

All of the patients concerned were offered a review in order to assess the outcome. Of the 227 patients (254 knees), 77% have been reviewed (167 patients, 190 knees). 23% (59 patients, 64 Knees) have not been seen. Of these, 30 patients (34 knees) declined review on the basis that they were happy with the result of surgery. 14 Patients (15 knees) were unobtainable by post of by phone. A further 12 patients (12 knees) did not attend appointments. 3 Patients (3 Knees) had died.

The total number of re-operations was 27/254, giving a re-operation rate of 10.6%. There were 21 revisions, 17 for aseptic causes (oversized components, malalignment, aseptic loosening) and 4 for infection. There were 6 secondary patella resurfacings.

A life table survivorship analysis was calculated for the 254 knees. The cumulative survival rate at 3 years was 85.8%. These results are considerably worse than those reported in the current published literature. This has resulted in a significant economic impact on our service.

Introduction: Dorsally angulated metaphyseal fractures of the proximal phalanges usually occur in the middle aged or elderly and are common. Reduction is difficult to maintain with non-operative treatment, due the action of the intrinsic muscles. Most techniques advocated in the literature suggest a transmetacarpal K-wire fixation.

We present the results of a simple method of stabilisation using intramedullary K-wires without violating the articular surface.

Methods: Over a three-year period, sixty patients with these fractures were treated in this way. A single wire is inserted through the rim of the proximal phalangeal base with MCPJ fully flexed, avoiding transfixion of the collateral ligament. The wire is passed up the medullary canal, across the fracture and up either to subchondral bone or to engage the opposite cortex. The metacar-pophalangeal joints were immobilised with a thermoplastic splint in full flexion and interphalangeal joints mobilised under supervision by the hand therapists. The wire was removed at three weeks.

Results: Most patients achieved a full range of movement at 6 weeks follow-up. There were no pin site infections.

Conclusion: Dorsally angulated metaphyseal fractures of the proximal phalanges fractures are difficult to treat by non-operative means. If the fracture heals in an angulated position the altered line of pull of the intrinsics will result in loss of flexion at the MCPJ and of power grip. This method is straightforward and gives satisfactory results. It avoids damage to the articular surface of the MCPJ, allows mobilisation of the entire digit and reliably controls the fracture.