Soft Tissue Radiological Knee (SToRK) Index: An observational cohort study to produce an index that quantifies the magnitude of soft tissue around the knee using standard radiographs.

INTRODUCTION: The soft tissue envelope around the knee can have an impact on the ease of performing surgery such as total knee replacement (TKR). BMI is often used in planning theatre time but may be a poor indicator of the soft tissue around the knee due to varying distribution of adipose tissue. Radiological images directly show the soft tissue. We therefore aim to develop a method of quantifying the soft tissue envelope around the knee using radiographs. METHOD: Plain weight-bearing radiographs were used to measure the total knee (soft tissue and bony) width at the level of the epicondyles of the knee and the bony epicondylar width of the femur. The ratio of the two widths was defined as the Soft Tissue Radiological Knee (SToRK) Index. The validity of the index as a true measure of soft tissue envelope was assessed using cross sectional areas on axial MRI cuts at the level of the epicondyles. The inter-observer reliability was assessed using the intra-class correlation coefficient. SToRK Index values were correlated with patients' BMI, gender and operative time. RESULTS: The results show there is a close correlation between the ratio of cross sectional area of MRI axial cuts at the level of epicondyles and the ratio of linear widths measured on plain radiographs, validating the SToRK Index as a measure of soft tissue envelope. There was also good to excellent inter-rater reliability of measurements of these widths. There was a close correlation between BMI and SToRK Index with differences between men and women. DISCUSSION: We believe the SToRK Index is a validated method of quantifying soft tissue distribution around the knee and gives surgeons a better descriptor of the knee envelope than BMI. It is easy to use, needs simple investigations and is reproducible.

The Avocado Hand - the UK Experience of the Management of Avocado Hand Injuries.

Background: Avocados are increasingly being consumed due to the nutritional benefits they provide. Avocado related hand injuries reflect their increasing popularity. Most injuries occur in attempting to de-stone the fruit. This is a prospective cohort study reviewing hand injuries sustained from preparing the fruit. Methods: Data was prospectively collected from three centres across United Kingdom (UK) over a 4-year period. The data was analysed for patient demographics, nature and zone of injury and management required. Results: A total of 35 patients and 42 injuries were included in the study. The median age of patients presenting with these injuries was 33 years, with majority of injuries occurring in the 21-30 age group. Most (88%, n = 31) of patients were male. Majority (85%, n = 36) of injuries happened during the de-stoning of the fruit. All injuries occurred in the non-dominant hand, with 70%, (n = 30) of wounds being sustained in zone 3. All injuries required surgical management and needed between 1 to 6 follow up outpatient visits. Vital structures such as tendons, digital nerves, pulleys and joint capsule were frequently implicated and required exploration or repair. Conclusions: Avocado related hand wounds are serious injuries with an associated morbidity. They frequently sustained by young patients. They usually require surgical management and may need numerous outpatient attendances. Caution and public education should be advocated on the preparation of avocados. This is the largest study to date that has reviewed the surgical management of avocado hand injuries.

Biomechanical Evaluation Comparing Pulvertaft Weave and Side-to-Side Tenorrhaphy Using Porcine Tendons.

Background: Pulvertaft Weave (PTW) is an established method of tenorrhapy in tendon transfers. Previous studies have suggested that a Side-to-Side (STS) tenorrhapy is easier to perform has the same advantages and has greater load to failure, ultimate load and stiffness compared to PTW. However, there is insufficient data comparing behaviour of STS and PTW during cyclical loading. The aim of this study is to compare these two methods in terms of creep after cyclic landing. Methods: Fresh porcine flexor digitorum tendons were used. Ten tendon PTW and ten STS repairs were performed. Cross sectional diameter was measured. The tendon repairs were tested by applying tension up to 25N for 100 cycles, followed by tension up to 75N for 100 cycles, followed by loading to failure. Force-displacement data was used to determine the creep of the repaired tendon. Results: All tendons survived 100 cycles of loading at 25N. After 1 cycle of loading, the mean cyclic creep in the PTW group was almost 3 mm larger than in the STS group (p = 0.046). After 100 cycles, the mean cyclic creep in the PTW group was 4.4 mm larger (p = 0.008). The cyclic creep rate was significantly larger in the PTW group (p < 0.001). All STS but only four PTW repairs survived after cyclic loading at 75N (p = 0.01). After 1 cycle and 100 cycles, mean creep of the surviving PTW samples was almost 7 mm (p = 0.006) and almost 9 mm (p = 0.004) larger than the STS group. The mean load to failure was four times larger in the STS group than the PTW group (p = 0.004). Conclusions: STS repairs have a significantly smaller permanent elongation after cyclic loading at 25N and 75N, a significantly smaller cyclic creep rate, require a significantly larger load to fail. This implies that STS repairs are less likely to elongate after cyclic loading and can withstand greater loads. These properties can be valuable in allowing patients to commence mobilisation immediately after surgery.

Ultrasound scanning helped surgeons to locate the buried metal work: A case series.

Removal of metalwork in children can be a challenging procedure, particularly if the metalwork is deeply buried and not palpable. This article proposes a surgical tip to help locate the position of metalwork just before the operation using an ultrasound machine and methylene blue dye. The technique involves using the ultrasound machine to locate the position of metalwork and marking the tract by injection of methylene blue dye just before prepping and draping the skin. This allows the operation to be performed through a smaller wound with less trauma to the soft tissues and avoids radiation exposure to the patient and theatre personnel. Our experience in a case series of 5 patients have found this a useful technique for removing threaded wires following a Salters osteotomy, where the wires can end up being buried beneath the iliac apophysis. It could however, be used to aid removal of any metal work where difficulty finding it is anticipated. Study expanded to include case series of patients rather than just one example. We have tracked a further 4 patients who have had the same technique used to include them in the paper. Reviewer 2 wanted further examples.

Locking plates for displaced fractures of the lateral end of clavicle: Potential pitfalls.

Roughly a quarter of all clavicle fractures occur at the lateral end. Displaced fractures of the lateral clavicle have a higher rate of nonunion. The management of fractures of the lateral clavicle remains controversial. Open reduction internal fixation with a superiorly placed locking plate is a recently developed technique. However, there are no randomized controlled trials to evaluate the efficacy of this procedure. We present a series of four cases which highlight the technical drawbacks with this method of fixation for lateral clavicle fractures. Two cases show that failure of the plate to negate the displacing forces at the fracture site can lead to plate pullout. Two cases illustrate an unusual complication of an iatrogenic injury to the acromioclavicular joint capsule which led to joint instability and dislocation. We advise caution in using this method of fixation. Recent studies have described the success of lateral clavicle locking plate fixation augmented with a coracoclavicular sling. This augmentation accounts for the displacing forces at the fracture site. We would recommend that when performing lateral clavicle locking plate fixation, it should be reinforced with a coracoclavicular sling to prevent plate failure by lateral screw pullout.