A novel device for preoperative skin preparation to reduce the risk of injury and surgical site infection during lower limb surgery.

Surgical site infection (SSI) continues to be a feared complication of surgery but especially orthopaedic surgery where a superficial SSI has been estimated to add nine days to the hospital stay and an average of £2500 to the cost. Despite the efficacy of all skin preparation agents being maximal at around 10 minutes no current system, apart from the double prep method attributed to Sir John Charnley, allows adequate control of bacteria. Current techniques of skin preparation require lifting of the limb with an associated risk of injury to theatre operatives. In order to provide for longer duration of contact, potentially better antisepsis and to remove the dangers inherent in lifting the limb we developed a novel system for limb antisepsis prior to surgery. To demonstrate efficacy we performed a single blind randomised controlled trial powered to demonstrate non-inferiority. We demonstrated a significant benefit of the device in terms of bactericidal effect. Whilst only recently entering full production, we would recommend the system as a significant improvement over current techniques of limb antisepsis.

Wrist denervation in isolation: a prospective outcome study with patient selection by wrist blockade.

Surgical wrist denervation involves division of the anterior and posterior interosseous nerves and articular branches of the superficial radial nerve. In this outcome study, 37 patients were individually assessed and deemed suitable for denervation surgery due to appreciable symptom resolution following a local anesthetic wrist block. At a mean of 18 months following denervation surgery, median activity pain scores had decreased by 60% (p < 0.001) from initial assessment levels, and more than three quarters (30/37) of patients reported continued improvement in their activity pain (p < 0.001). More than two thirds of patients had a satisfaction VAS of greater than 50, with less postoperative resting pain and a greater reduction in postoperative activity pain as the important predictors of patient satisfaction. Thirty-one out of the 37 patients had not represented to our department for revision wrist surgery by a mean of 10.3 years follow-up. We have found this procedure useful in ameliorating symptoms for some patients who would conventionally have required partial or total wrist fusions with greater residual functional limitation.

Operative treatment of Linburg-Comstock syndrome.

Linburg-Comstock syndrome is characterised by an anomalous tendon slip from the flexor pollicis longus to the flexor digitorum profundus, usually of the index finger. An incidence as high as 60% to 70% has been reported. Post-traumatic inflammation of inter-tendinous connections between the flexor pollicis longus and flexor digitorum profundus, usually of the index finger, may cause unexplained chronic pain in the distal forearm. A total of 11 patients (eight females, three males), mean age 29.1 years (14 to 47) with a clinical diagnosis of Linburg-Comstock syndrome underwent surgical release of the inter-tendinous connection. The mean follow-up was for 27 months (2 to 48). Ten patients reported excellent relief of pain in the forearm, with independent flexion of flexor pollicis longus and flexor digitorum profundus to the index finger. Surgical release was an effective treatment for the Linburg-Comstock syndrome in this series.

Analysis of rewarming curves in Raynaud's phenomenon of various aetiologies.

This study investigated whether a modified Cold Provocation Test could distinguish between 86 normal subjects and 31 patients with Raynaud's phenomenon or 59 with hand arm vibration syndrome (HAVS). Of the HAVS subjects, 56 were seen for medical reports as they were involved in litigation. Their assessments were done in a different location but the same protocol was used. A standardised cold stress was used to reduce the finger temperature to 15 degrees C or less without inducing reflex hyperaemia. This test had acceptable repeatability for subjects without HAVS with an intra-class correlation of 0.7. Baseline temperature, temperature rise in the first 30 seconds and the time taken to rewarm by 5 degrees C were measured. Patients with Raynaud's phenomenon and HAVS had cooler hands than controls. HAVS patients rewarmed most in the first 30 seconds. Patients with Raynaud's phenomenon take longer to rewarm by 5 degrees C than controls or those with HAVS (P<0.001). A baseline difference of >7.5 degrees C between the temperature of the digit and that of the room is unlikely to occur in patients with Raynaud's phenomenon or HAVS. A temperature gain of > or =2.2 degrees C in the first 30 seconds on rewarming combined with a low baseline temperature strongly suggests HAVS. This modified cold provocation test may differentiate between patients with Raynaud's phenomenon, HAVS and controls but this observation requires independent verification in subjects not involved in litigation and tested in the same facility.

Risk factors in carpal tunnel syndrome.

We have undertaken a large case-control study using the UK General Practice Research Database to quantify the relative contributions of the common risk factors for carpal tunnel syndrome (CTS) in the community. Cases were patients with a diagnosis of CTS and, for each, four controls were individually matched by age, sex and general practice. Our dataset included 3,391 cases, of which 2,444 (72%) were women, with a mean age at diagnosis of 46 (range 16-96) years. Multivariate analysis showed that the risk factors associated with CTS were previous wrist fracture (OR=2.29), rheumatoid arthritis (OR=2.23), osteoarthritis of the wrist and carpus (OR=1.89), obesity (OR=2.06), diabetes (OR=1.51), and the use of insulin (OR=1.52), sulphonylureas (OR=1.45), metformin (OR=1.20) and thyroxine (OR=1.36). Smoking, hormone replacement therapy, the combined oral contraceptive pill and oral corticosteroids were not associated with CTS. The results were similar when cases were restricted to those who had undergone carpal tunnel decompression.

Extracorporeal shock-wave treatment for tennis elbow. A randomised double-blind study.

The efficacy of extracorporeal shock-wave therapy for tennis elbow was investigated using a single fractionated dosage in a randomised, double-blind study. Outcomes were assessed using the Disabilities of Arm, Shoulder and Hand questionnaire, measurements of grip strength, levels of pain, analgesic usage and the rate of progression to surgery. Informed consent was obtained before patients were randomised to either the treatment or placebo group. In the final assessment, 74 patients (31 men and 43 women) with a mean age of 43.4 years (35 to 71), were included. None of the outcome measures showed a statistically significant difference between the treatment and control groups (p > 0.05). All patients improved significantly over time, regardless of treatment. Our study showed no evidence that extracorporeal shock-wave therapy for tennis elbow is better than placebo.

The rhomboid flap: a simple technique to cover the skin defect produced by excision of a mucous cyst of a digit.

Rhomboid flaps were used rather than rotation flaps for skin cover after excision of mucous cysts of the finger in six patients. The rhomboid flap is a safe, reliable technique which is more easily taught and applied than the rotation flap.

Clinical diagnosis of triquetrolunate ligament injuries.

The clinical diagnosis of peritriquetral injuries is difficult. We describe our diagnostic technique based on specific questions and three clinical tests. The accuracy of our diagnostic technique was compared prospectively with the definitive diagnosis made at arthroscopy. Preoperatively, 19 patients were diagnosed as having triquetrolunate dissociation. This was confirmed at arthroscopy in 17. Another five patients not diagnosed preoperatively were also diagnosed at arthroscopy as having mainly triquetrolunate dissociation. The sensitivity of our diagnostic protocol was 0.77 and the positive predictive value was 0.89.

Carpal tunnel syndrome after distal release of the flexor digitorum profundus and subsequent retraction of the lumbrical muscle into the carpal tunnel.

We present three patients who had traumatic amputation of a finger or fingers with subsequent retraction of the flexor digitorum profundus and lumbrical muscle leading to the development of carpal tunnel syndrome.

The thermal effects of Kirschner wire fixation on small bones.

The aim of this study was to assess bone heating caused by the passage of fine (<2 mm) K-wires of different types. Stainless steel K-wires of trocar and diamond point configurations (0.8-2.0 mm) were drilled into the metatarsal bones from a freshly amputated lower limb at a constant force. Temperature measurements were made by miniature thermocouples inserted into the bones, at 3 second intervals over a period of 3 minutes while each K-wire was drilled three times. The temperature reached varied with the tip configurations and the diameter of the K-wires. Regardless of point configuration, thinner wires generated more heat than thicker ones.

Radial tunnel syndrome: diagnosis and management.

This study presents a review of 26 cases of radial tunnel syndrome in 25 patients seen in a single hand consultant's practice over a period of 2.5 years. The protocol for diagnosis was the reproduction of patient's symptoms on pressure over a palpable tender spot along the course of the radial tunnel, painful resisted supination or resisted middle finger extension, all of which were abolished on infiltration of the tender area with a local anaesthetic solution. The presence of at least two out of three objective signs was necessary for the diagnosis. Initially all cases were treated conservatively, by steroid injection in 25 and physiotherapy in one, with long-term relief of pain in 16. Nine failures were treated surgically, with complete relief of pain in seven. Radial tunnel syndrome should be considered in the differential diagnosis of pain around the hand and or elbow.

Late secondary rupture of flexor pollicis longus masquerading as primary trauma.

Two cases of loss of function of the flexor pollicis longus tendon are presented. Initial assumptions that these were cases of primary tendon rupture proved to be wrong when unexpected intraoperative findings suggestive of previous long standing tendon rupture were later matched with a history of previous trauma. Spontaneous subcutaneous rupture is rare in otherwise healthy tendons.

A comparison of post-operative mobilization of flexor tendon repairs with "passive flexion-active extension" and "controlled active motion" techniques.

We report a comparative study of the outcome of flexor tendon repairs mobilized by either a "passive flexion-active extension" or a "controlled active motion" regimen. We show that the controlled active motion regimen conferred significant benefits on the final range of motion and extensor lag. The rupture rate was raised with "controlled active motion" but this was not greater than levels reported by other authors using "passive flexion-active extension" regimens.

Can a simple test of visual-motor skill predict the performance of microsurgeons?

A new test of manual dexterity and a test of spatial ability were administered to 37 participants of a microsurgery training course. Performance on microsurgical tasks undertaken by the trainees to assess their surgical skill correlated significantly (rho = -0.54, P < or = 0.01) with manual dexterity and (rho = 0.36, P < or = 0.05) spatial ability. The first of these findings is contrary to those of studies concerned with general surgery whereas the second confirms the results of reported research. Explanation for the results is given in terms of the specific nature of microsurgical skill compared with general surgery.

Double V-Y advancement flaps in the reconstruction of skin defects of the anterior lower limb.

A double V-Y advancement flap based upon a vertical subcutaneous pedicle was assessed for reconstruction of moderate sized defects of the anterior lower leg. The technique is described and the results of a retrospective analysis of thirteen cases are given. The procedure has proven to be a reliable alternative means of providing skin cover in this area.