Abstract

The aim of our study is to investigate the natural history of scaphoid non-union.

Factors affecting the outcome of scaphoid fracture non-union surgery were assessed using data collected retrospectively from 785 cases treated at 18 centres throughout the UK. All cases had undergone this surgery before October 2014, ensuring a minimum period of 2 years between surgery and data collection from the medical records.

Smoking status significantly influenced the union rate of 94 proximal pole (non-smokers = 71%, smokers = 44%, p < 0.05) but not waist (non-smokers = 73% non-unions.

Type of bone graft did not affect the union rate of the 282 waist nonunions (iliac crest = 69%; non-vascular distal radius = 75% and vascularised distal radius = 70%: P=0.35), but did influence the union rate of the 98 proximal pole nonunions (iliac crest = 58%; non-vascular distal radius = 58% and vascularised distal radius = 82%: P=0.004).

Time interval between fracture and non-union surgery did not affect the union rate of 121 proximal pole nonunions (3–6 months = 56%; 6–12 months = 76%; 1–2 years = 69%; 2+years = 54%: P=0.5), but did influence the union rate of 303 nonunions of the waist (3–6 months = 80%; 6–12 months = 82%; 1–2 years = 65%; 2+years = 55%: P=0.02).

Non-unions of the proximal pole appear to be influenced by smoking status and bone graft type, whereas non-unions of the scaphoid are influenced by the time to non-union surgery.

Heterotopic ossification (HO) is the formation of lamellar bone in extra-skeletal soft tissues. Its exact pathogenic mechanism remains elusive. Previous studies demonstrate observation only of HO at the microscopic scale. This study uses scanning electron microscopy (SEM), Back-scatter electron (BSE) imaging and mechanical testing to detail the organic and non-organic elements of HO, compared to normal bone, to guide stem cell and bio-modelling research into HO. Samples analysed were 5 military blast related HO patients, 5 control cadaveric samples (age and sex matched). Samples were imaged using SEM, BSE and the I13 beam Synchrotron x-ray diffraction scanner using validated quantitative and qualitative techniques of measurement. Appearances seen in HO compared to normal bone were characterised by the presence of a hyper-vascular network and high lacunae (osteocyte) counts, two distinct zones of bone mineral density distribution, with a tendency for hypermineralisation with kurtosis of the grey scale plots (mineral content as a weight percentage of Ca²⁺ was calibrated to atomic weight of C, Al and HA). Direction of dependence and collagen orientation in HO suggest isotropic properties. This research demonstrates that HO is bone, however its characteristics suggest a high metabolic turnover and disorganised ultra-structure consistent with an inflammatory origin.

Historically human and animal bites to the hand have resulted in significant morbidity in relation to the high risk of contamination and subsequent infection. Our study aimed to assess the outcomes following such injuries in terms of infection requiring further intervention through specialist referral to the hand surgery team at our hospital.

124 consecutive patients attending the A&E department over a three month period in 2011 were included in this retrospective study which provided 126 separate cases due to bilateral injuries (110 animal: 16 human). Data was obtained from the electronic patient management system. The demographics of each patient were recorded followed by type of bite sustained including number and size of lacerations.

79% of patients presented within 24 hours and the majority before 6 hours from injury. The majority of the forearm bites were documented as superficial abrasions and none of these went on to develop problems with infection, so the study concentrated on bite injuries to the hand of which there were 99 cases. Most hand injuries were a single puncture or laceration (64%) but in 9 cases there were greater than 3 separate wounds.

5 cases were directly referred to the Hand surgery team with 4 requiring admission and of these 3 required washout and debdridement in theatres. The remaining 94 cases were managed solely by A&E. Of these 94 cases 87 pts received Abx and 78 pts had a lavage. Overall 68% received both Abx and lavage. Subsequent to discharge from A&E only 3 developed problems with infection later (2 requiring specialist input) they were all dog bites and in keeping with the ‘typical’ bite pattern seen in other pts.

The study concluded that bites not involving joint, tendon or bone have only a small chance of causing infection provided good initial treatment.

Background

Scaphoid fracture malunion with flexion and shortening results in the ‘humpback deformity’. This is thought to be associated with poor clinical results when assessed with the lateral intra-scaphoid angle and the Green and O'Brien wrist evaluation scale. This method of deformity measurement is now considered unreliable and the functional score has not been validated in the setting of scaphoid fractures.

Background

It was hypothesised that preserving a layer of gliding tissue, the parietal layer of the ulnar bursa, between the contents of the carpal tunnel and the soft tissues incised during carpal tunnel surgery might reduce scar pain and improve grip strength and function following open carpal tunnel decompression.

Background

A randomised prospective study has already demonstrated that at 1-year follow-up, palmaris longus interposition or flexor carpi radialis (FCR) ligament reconstruction and tendon interposition do not improve the outcome of trapeziectomy for the treatment of painful osteoarthritis of the trapeziometacarpal joint. This study consisted of 183 thumbs in 162 women.

We aim to assess the AP distance and teardrop angles in a cohort of normal wrists and to assess their possible use as prognostic indicators in fractures of the distal radius.

Two hundred standardised PA and lateral wrist radiographs from uninjured wrists and 95 patients with fractures of the distal radius were assessed and anatomic parameters measured, including the Teardrop angle and AP distance. Clinical assessment at a mean of 6 years post fracture included an assessment of grip strength and range of motion along with the DASH score.

The mean teardrop angle in 200 normal wrists was 68 degrees (95%CI:67–69 degrees) and did not differ significantly between sexes (p=0.148). The average teardrop angle at presentation in 95 fractures of the distal radius was 47 degrees (95%CI:41–50 degrees), improving significantly to 58 degrees (95%CI:56–61 degrees, p< 0.0001) post-reduction, and this improvement was maintained at 56 degrees (95%CI:54–59 degrees) at union. The final position was significantly better than at presentation (p< 0.0001).

Loss of teardrop angle between the fractured and uninjured wrist was significantly related to reduced grip strength (p=0.04) and worse DASH score (p=0.03). The mean AP distance in 200 normal wrists was 19.6mm (95%CI:19.4–19.9mm) in males and 17.6mm (95%CI:17.2–18.0mm) in females, which is significantly different (p< 0.0001). The mean AP Distance at presentation in 95 fractures of the distal radius was 21.0mm (95%CI:20.4–21.7mm), which improved significantly to 19.6 (95%CI:19.1–20.2mm, p< 0.0001), but subsequently worsened to 20.8mm (95%CI:20.2–20.4mm) at union. This is not significantly better than at presentation (p=0.397). An increase in AP distance in the fractured wrist correlated to loss of range of motion (p< 0.01).

The value of these parameters is that they offer quite detailed assessment of the articular surface of the distal radius in the absence of more detailed imaging. They appear to be of prognostic value.

Carpometacarpal arthritis of the thumb is a common source of morbidity particularly in post-menopausal women. It is commonly and successfully treated by trapeziectomy with or without ligament reconstruction and tendon interposition. This randomised prospective study compared the results of trapeziectomy alone or combined with tendon interposition and ligament reconstruction in 125 patients. Each patient had subjective and objective assessment of thumb pain, stiffness and strength and were scored using the D.A.S.H. and P.E.M. scoring systems. Patients were assessed pre-operatively and at 3 months and 1 year after surgery. The results of the two procedures revealed statistically improved pain levels but there was no statistically significant difference between the two in terms of pain relief, stiffness, weakness, grip strength, keypinch and thumb key pinch as well as in the D.A.S.H. and P.E.M. scores. The study shows that in the short term soft tissue reconstruction in addition to a simple trapeziectomy provides no improved benefit to the patient.

We have assessed the results of 34 simple excisions of the trapezium, with no additional soft-tissue procedures, in 30 patients. At a median follow-up of five years (2 to 22), 16 thumbs (47%) were completely painfree and a further 10 (29%) were slightly painful after use. Nineteen thumbs (56%) had no functional disability, but thumb-pinch strength was reduced by about 20%. No patient had painful degeneration at the scaphotrapezial pseudarthrosis.

In a prospective study we assessed the causes of mechanical failure in a series of 230 intertrochanteric femoral fractures which had been internally fixed with either a sliding hip screw or a Kuntscher Y-nail. The overall rate of mechanical failure was 16.5%; cutting-out of the implant from the femoral head was the cause in three-quarters of the instances. Implants placed posteriorly in the femoral head cut out more often (27%) than those placed centrally (7%). The cut-out rate was also determined by the quality of the fracture reduction, but age, walking ability and bone density (assessed by the Singh grade and metacarpal indices) had no significant influence. We conclude that these fractures should be reduced as accurately as possible and it is imperative that the implant is placed centrally within the femoral head.