DOH Cast Technician oral exam prep

Knowledge: This is acute compartment syndrome until proven otherwise. Pain out of proportion to the injury and pain on passive stretch are the earliest signs; palpable pulses and normal capillary refill do not exclude it, because compartment pressure rises above capillary pressure long before arterial flow stops. Tingling in the first web space suggests the deep peroneal nerve in the anterior compartment is affected. Tibial shaft fractures in young men carry the highest risk. Muscle and nerve damage becomes irreversible within hours, so the diagnosis is clinical and fasciotomy is time-critical.

Management: I would call the orthopaedic doctor immediately as an emergency and use the escalation chain if there is no prompt answer. Under the facility protocol I would split the backslab bandage and every layer of padding down to the skin along the whole length, and spread it, while keeping the fracture supported. I would place the leg at heart level rather than elevated, because elevation lowers perfusion pressure. I would stay with him, reassess pain, sensation and movement every 15 to 30 minutes, and report any drop in blood pressure. I would not reapply a tight bandage, raise the limb high, or let the team give more opioid and wait. If symptoms persist after splitting, the surgeon decides on decompression and I would help prepare for theatre. I would record times of the call, the split and each check.

Ethics and communication: I would explain to him what I am doing and why, and gain his agreement before splitting the cast. Diagnosis and fasciotomy belong to the surgeon, but delay is not acceptable, so I escalate firmly. Clear documentation of times protects the patient and the team. If the request had sat on the ward unanswered, I would report it through the incident system.

Reference: BOA Standards for Trauma (BOAST): Diagnosis and Management of Compartment Syndrome of the Limbs; Rockwood and Green's Fractures in Adults

Knowledge: Neuropathy removes the warning pain, so absence of pain does not reassure me. A smell, staining over the heel, a low fever and high glucose point to a pressure ulcer, probably infected, which may be deep. Bony prominences at risk in a below-knee cast are the heel, both malleoli, the base of the fifth metatarsal and the fibular head, where the common peroneal nerve also runs. Common causes are thin padding, dents from fingertip handling, a cast that is too tight and pressure while lying in bed. Heel ulcers in people with diabetes heal slowly and can lead to osteomyelitis.

Management: I would tell the fracture clinic doctor straight away and, with their agreement, remove the cast fully rather than cutting a window, so the whole limb can be inspected. I would measure and photograph the wound with consent and describe it using a recognised pressure injury staging. While the doctor decides on investigations, antibiotics and glucose control, I would support the fracture in a well-padded backslab. The doctor would refer her to the diabetic foot or wound team. Any new cast needs extra padding over the heel and malleoli, and heel offloading in bed. The surgeon may prefer a removable boot so the skin can be checked. I would arrange more frequent cast checks. I would not simply pad over the stain or send her home because she has no pain.

Ethics and communication: This is a device-related harm, so she and her daughter, with her permission, deserve an honest explanation and an apology in line with facility policy. I would report it through the incident system and document what I found and did. The review should ask whether her neuropathy was flagged at the original casting.

Reference: NPIAP/EPUAP/PPPIA International Pressure Ulcer Guideline (2019); IWGDF Guidelines on the prevention and management of diabetes-related foot disease (2023)

Knowledge: An oscillating saw cuts by vibration and should not cut skin when used correctly, but dragging the blade along the cast, working over bony prominences, thin padding and fibreglass all raise the risk of burns and cuts. Blade friction heats the blade quickly, and research has shown blade temperatures high enough to burn during routine use. Correct technique uses an in-and-out plunging motion, avoids prominences, pauses to let the blade cool, uses sharp blades and dust extraction, and finishes with a spreader and scissors. Buckle fractures are stable, and NICE NG38 advises a removable splint for them rather than a cast. Children may move suddenly, so preparation and distraction matter.

Management: I would stop the saw immediately, comfort the child and cool the burn under cool running water for about 20 minutes. I would ask the doctor to assess the burn and cut, including any need for wound care or tetanus advice. An experienced person would finish the removal with cast shears or a spreader, away from the injured area. I would dress the wound and arrange follow-up. I would take the saw and blade out of use for checking. I would complete an incident report, then debrief the trainee privately and supervise their next removals. I would record the injury, first aid and advice given.

Ethics and communication: I would apologise to the mother and child and explain honestly what happened, as the supervising technician who carries responsibility. I would stay calm about the filming, avoid arguing, and follow facility policy on recordings. I would not blame the trainee in front of the family. Her guardian should receive written aftercare advice.

Reference: Killian et al, Cast-saw burns: comparison of technique versus material versus saws (J Pediatr Orthop 1999); NICE NG38 Fractures (non-complex): assessment and management (2016)

Knowledge: A femoral fracture in a baby who is not yet walking should raise concern for physical abuse, because the explanation of a short fall rarely fits. Bruising in a non-mobile infant is uncommon, and bruises on the back and arms, in several colours, and a torn frenulum are recognised warning signs. NICE CG89 advises suspecting maltreatment in these situations. The medical team decides on investigations such as a skeletal survey and head imaging. My role is to notice, record and report, not to investigate or decide. Children under 6 months are often treated in a harness, so a spica is a common choice at this age.

Management: I would complete the spica safely, because the fracture needs treatment, while staying calm and kind with the father. I would inform the treating orthopaedic doctor and the paediatric team promptly and privately, describing exactly what I saw. I would record the bruises and the frenulum factually, with site, size and colour, on a body map if the facility uses one, and quote the father's explanation word for word. I would follow the facility child protection policy and confirm that the concern has been reported to the designated lead. I would not question the father about abuse, accuse him or promise confidentiality. The baby should not be discharged until the team has reviewed him. Spica care advice still goes to the carers.

Ethics and communication: Federal Law No. 3 of 2016 on Child Rights (Wadeema's Law) requires health professionals to report suspected abuse, and confidentiality does not override that duty. Raising a concern is not an accusation; the child's welfare comes first. Accurate notes made at the time matter if the case is reviewed later.

Reference: NICE CG89 Child maltreatment: when to suspect maltreatment in under 18s (2009, updated 2017); Federal Law No. 3 of 2016 on Child Rights (Wadeema's Law) (UAE)

Knowledge: Lower limb immobilisation in a cast is an important risk factor for venous thromboembolism, and her risk is raised further by the contraceptive pill, obesity and an Achilles rupture. NICE NG89 asks for a risk assessment of people with lower limb immobilisation and for prophylaxis to be considered when risk is raised. Calf ache with new breathlessness, a fast pulse, fast breathing and low saturation suggest deep vein thrombosis with pulmonary embolism, which can kill. Diagnosis and treatment, including imaging and anticoagulation, are medical decisions. The cast change is not the priority.

Management: I would stop the cast change, sit her upright, and call the doctor or emergency team at once. I would give oxygen if the facility protocol allows, and monitor her pulse, blood pressure, breathing and saturation. She should not walk. I would hand over clearly: who she is, her symptoms and observations, her risk factors and the cast date. I would not massage the calf or remove the cast without instruction. I would ask whether a risk assessment and prophylaxis were given at the first casting. Later, the cast change is done as the team directs, keeping the ankle in the prescribed equinus position.

Ethics and communication: I would explain calmly what I am worried about and why she needs urgent assessment. If no thrombosis risk assessment was done when the cast was applied, I would report the gap through the incident system so the pathway improves. I would document the times and my actions. Diagnosis and anticoagulation are outside my scope, so prompt escalation is the safe course.

Reference: NICE NG89 Venous thromboembolism in over 16s: reducing the risk of hospital-acquired deep vein thrombosis or pulmonary embolism (2018, updated 2019); ESC Guidelines for the diagnosis and management of acute pulmonary embolism (2019)

Knowledge: Wet padding macerates the skin and harbours bacteria, and K-wire sites are an entry point for infection. Discharge, odour, fever and increasing swelling suggest pin site infection that may be spreading into deeper tissue, with a risk of wire loosening, loss of fracture position and osteomyelitis. Decisions on swabs, antibiotics and wire removal belong to the doctor. Standard precautions, hand hygiene and an aseptic non-touch technique for pin sites reduce the risk of spread. The cast room equipment and couch can carry organisms between patients.

Management: I would perform hand hygiene and wear gloves and apron, and inform the orthopaedic doctor before removing the cast with their agreement. I would inspect the pin sites and skin, check sensation, movement and circulation in the hand, and record findings. If the doctor requests, I would take a swab. Once the doctor has decided on antibiotics or wire removal, I would apply sterile pin site dressings and a new, well-padded cast or backslab. I would clean the saw, couch and work area and dispose of waste correctly. I would give clear advice on keeping the cast dry with a waterproof cover and on returning early with pain, fever or discharge. I would not dry and re-wrap wet padding, or cover the problem with a fresh layer.

Ethics and communication: Construction work makes it hard to keep a cast dry and clean, so I would discuss realistic options and, if he needs it, a medical note for modified duties. I would explain the plan and gain his consent before removing the cast. I would document findings and advice, and report any lapse in equipment cleaning.

Reference: WHO Guidelines on Hand Hygiene in Health Care (2009); Royal College of Nursing, Guidance on pin site care (2011)