Cite this article: Bone Joint Res 2022;11(12):890–892.

Kirschner wires are commonly used in paediatric fractures, however, the requirement for removal and the possibility of pin site infection provides opportunity for the development of new techniques that eliminate these drawbacks. Bioabsorbable pins that remain in situ and allow definitive closure of skin at the time of insertion could provide such advantages.

Three concurrent studies were performed to assess the viability of bioabsorbable pins across the growth plate. (1) An epidemiological study to identify Kirschner wire infection rates. (2) A mechanical assessment of a bioabsorbable pin compared to Kirschner wires in a simulated supracondylar fracture. (3) The insertion of the implants across the physis of sheep to assess effects of the bioabsorbable implant on the growth plate via macroscopic, pathohistological and micro-CT analysis.

An infection rate of 8.4% was found, with a deep infection rate of 0.4%. Mechanically the pins demonstrated comparable resistance to extension forces (p=) but slightly inferior resistance to rotation (p=). The in vivo component showed that at 6 months: there was no leg length discrepancy (p=0.6), with micro-CT evidence of normal physeal growth without tethering, and comparable physeal width (p=0.3).

These studies combine to suggest that bioabsorbable pins do not represent a threat to the growth plate and may be considered for physeal fracture fixation.

Simulation in surgical training has become a key component of surgical training curricula, mandated by the GMC, however commercial tools are often expensive. As training budgets become increasingly pressurised, low-cost innovative simulation tools become desirable. We present the results of a low-cost, high-fidelity simulator developed in-house for teaching fluoroscopic guidewire insertion.

A guidewire is placed in a 3d-printed plastic bone using simulated fluoroscopy. Custom software enables two inexpensive web cameras and an infra-red led marker to function as an accurate computer navigation system. This enables high quality simulated fluoroscopic images to be generated from the original CT scan from which the bone model is derived and measured guidewire position. Data including time taken, number of simulated radiographs required and final measurements such as tip apex distance (TAD) are collected.

The simulator was validated using a DHS model and integrated assessment tool. TAD improved from 16.8mm to 6.6mm (p=0.001, n=9) in inexperienced trainees, and time taken from 4:25s to 2m59s (p=0.011). A control group of experienced surgeons showed no improvement but better starting points in TAD, time taken and number of radiographs.

We have also simulated cannulated hip screws, femoral nail entry point and SUFE, but the system has potential for simulating any procedure requiring fluoroscopic guidewire placement e.g. pedicle screws or pelvic fixation. The low cost and 3D-printable nature have enabled multiple copies to be built. The software is open source allowing replication by any interested party. The simulator has been incorporated successfully into a higher orthopaedic surgical training program.

Purpose

To assess outcomes of manipulating upper extremity fractures with conscious sedation compared with formal reduction and casting in theatre under general anaesthesia and image intensifier control.

Purpose of the study and background

The CONNECT trial evaluated a theory-based intervention to increase low back pain patients' adherence to treatment recommendations through physiotherapists' communication behaviour. Bridging the gap between evidence and evidence-based practice, we aimed to develop an implementation intervention to support physiotherapists in translating the CONNECT communication training into practice.

Purpose of the study and background

Physical activity and exercise therapy are among the guideline recommendations for the rehabilitation of people with chronic low back pain (CLBP ≥ 3 months); however, patient adherence is often poor. CONNECT is a theory-based communication skills training programme designed to enhance physiotherapists' support of their CLBP patients' psychological needs in order to increase adherence to their home-based rehabilitation programme.

Controversy remains as to whether the contralateral hip should be fixed in patients presenting with unilateral slipped capital femoral epiphysis (SCFE). This study compares the outcomes of those patients who had prophylactic fixation with those who did not.

We identified 90 consecutive patients with a mean age of 12.3 years presenting to the study centre with SCFE from a prospective operative database. The patient's notes and radiographs were retrospectively analysed for post-operative complications, re-presentation with a contralateral slip, and the presence of a cam lesion.

The mean length of follow-up was 8 years (range 3 to 13). Fifty patients (56%) underwent unilateral fixation and 40 patients underwent bilateral fixation, of which 4 (4%) patients had simultaneous bilateral SCFE and 36 (40%) had prophylactic fixation of the contralateral hip. Twenty-three patients (46%) that underwent unilateral fixation, went onto have contralateral fixation for a further SCFE. Two patients from this group had symptomatic femoracetabular impingement from cam lesions and one patient required a Southwick osteotomy for a severe slip. Five patients (10%) that had unilateral fixation only demonstrated cam lesions on radiographic analysis, being suggestive of an asymptomatic slip. No post-operative complications were observed for the contralateral hip in patients that had prophylactic screw fixation and no cam lesions were identified on radiographic assessment.

This study suggests that the contralateral hip in patients presenting with unilateral SCFE should be routinely offered prophylactic fixation to avoid a further slip, which may be severe, and the morbidity associated with a secondary cam lesion.

Purpose

This pilot study tested the feasibility of a self-determination theory-based communication skills training programme designed to increase physiotherapists' psychological needs supportive behaviour when treating patients with chronic low back pain (CLBP>12 weeks).

Introduction: It has been suggested that statins may influence bone turnover via an effect on bone morphogenic protein 2 (BMP-2). While the effect on statins in the prevention of osteoporosis remains controversial there is some evidence that they may exert a significant effect on fracture healing.

Using a newly developed fracture model of the proximal tibia of the rat, the effect of simvastatin on osteoporotic and non-osteoporotic fracture healing was investigated. The fracture model was used as it provided a useful model of metaphyseal fracture healing which is particularly relevant to osteoporotic fracture.

Methods: Four groups of 20 3-month-old female Wistar rats were used. Half underwent ovariectomy (ovx) while the remainder had a sham procedure. 8 weeks later a fracture was created in the proximal tibia of each animal by three point bending. The fractures were supported by a narrow intramedullary k-wire. 20 sham and 20 ovx animals were then fed 20mg/kg simvastatin by gavage for 14 days while the rest received placebo. 10 animals from each group were sacrificed at 2 weeks post surgery while the rest were sacrificed at 4 weeks.

X-rays of the healing fractures were taken. Both the intact and fractures tibiae were then taken for mechanical testing by four point bending.

Results: Six animals (7.5%) were excluded because of fracture comminution (5) or loss of stabilisation (1). There was a similar radiological appearance in all 4 groups at each time point. At two weeks: there was no difference in the mechanical properties of the healing bone between the groups. At 4 weeks the fractured and intact tibiae from the sham animals had an equal ultimate load at failure to their intact tibiae. However, the fractured tibiae from the ovx animals remained weaker (ovx & placebo 68%, ovx & statin 60.5% of ultimate load at failure compared with intact tibia). The difference between the fractures ultimate load in ovx and sham animals was statistically significant (p=0.0105). No difference was seen between the statin and placebo group.

Discussion: This work provides evidence that a metaphyseal fracture in the osteoporotic rat model is able to withstand significantly less load at 4 weeks than a fracture from a sham ovx animal suggesting fracture healing is slower in osteoporotic individuals. Simvastatin at 20mg/kg had no effect on the mechanical properties of normal or osteoporotic fracture healing in this study.

Previous studies have suggested that bilateral TKR is a safe and economically advantageous procedure. However, because of persistent concerns about complications and patients’ ability to rehabilitate, it has not yet become routine practice.

Using data from the Scottish Arthroplasty Project, which has centrally collated data gathered prospectively between 1989 and 1999, we analysed 19 247 patients who underwent primary knee replacement. Any subsequent admission for TKR was noted. Deaths following an index procedure were identified from the General Register of Deaths.

In 30% of patients a contralateral TKR was done within 5 years. The overall hospital stay for both unilateral and bilateral TKR has been comparable since 1993. The mortality rate following simultaneous bilateral TKR (1%) is similar to that following unilateral TKR (1.2%).

Only 25% of Scottish Surgeons perform simultaneous bilateral TKR. However, bilateral knee arthritis is common and bilateral TKR carries no significantly increased cumulative risk of death, deep infection or need for revision. The increased likelihood of blood transfusion should be offset against the definite advantages of one anaesthetic, a reduced hospital stay and good early outcome.