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Biomedical subjects

P E Allen

Publications and source records attributed to P E Allen.

16 recordsLinked to original sources
PubMed2005

Arthroscopic ankle arthrodesis.

We reviewed 116 patients who underwent 118 arthroscopic ankle arthrodeses. The mean age at operation was 57 years, 2 months (20 to 86 years). The indication for operation was post-traumatic osteoarthritis in 67, primary osteoarthritis in 36, inflammatory arthropathy in 13 and avascular necrosis in two. The mean follow-up was 65 months (18 to 144). Nine patients (10 ankles) died before final review and three were lost to follow-up, leaving 104 patients (105 ankles) who were assessed by a standard telephone interview. The preoperative talocrural deformity was between 22 degrees valgus and 28 degrees varus, 94 cases were within 10 degrees varus/valgus. The mean time to union was 12 weeks (6 to 20). Nonunion occurred in nine cases (7.6%). Other complications included 22 cases requiring removal of a screw for prominence, three superficial infections, two deep vein thromboses/pulmonary emboli, one revision of fixation, one stress fracture and one deep infection. Six patients had a subtalar fusion at a mean of 48 months after ankle fusion. There were 48 patients with excellent, 35 with good, 10 with fair and 11 with poor clinical results.

Adult↗
PubMed2001

Fractures of the tuberosity of the calcaneus.

We describe 24 fractures of the tuberosity of the calcaneus in 22 patients. Three were similar to the type of avulsion fracture which has been well-defined but the remainder represent a group which has been unrecognised previously. Using CT and operative findings we have defined the different patterns of fracture of the calcaneal tuberosity. Ten fractures extended into the subtalar joint, but did not fit the pattern of the common intra-articular fracture as described classically. We have defined a new pattern which consists of a fracture of the medial calcaneal process with a further fracture which separates the upper part of the tuberosity in the semicoronal plane. Non-operative treatment of displaced fractures resulted in a mis-shapen heel and a poor functional outcome. Open reduction and internal fixation with either a plate or compression screw did not give satisfactory fixation. We prefer to use an oblique lateral tension-band wire. This technique gave excellent fixation and we recommend it for the treatment of displaced fractures of the tuberosity of the calcaneus.

Adolescent↗
PubMed1999

Management of the radial composite donor site: an orthopaedic opinion.

Maxillofacial and plastic surgeons have reported on the management of radial composite flap donor sites, but little reference is made to orthopaedic advice. Orthopaedic surgeons manage forearm injuries more often than other specialties and we thought that an orthopaedic consensus was long overdue. The composite radial donor site subsequently fractures in up to 43% of cases. There is no agreement on the optimal management of these difficult injuries and the patient is often referred for orthopaedic advice. Options include plaster-cast immobilization, internal fixation with either a plate or intramedullary nail, and external fixation. Bone grafting may also be required. A postal questionnaire, using two case histories including radiographs, was sent to 100 consultant orthopaedic surgeons in the UK asking how they would manage the donor site primarily and how they would manage a fracture at this site. Fifty-nine adequate replies were received. Generally, six weeks of immobilization in a plaster of Paris (POP) cast was considered sufficient for the initial management of the donor site. In the event of a fracture, internal fixation with a dynamic compression plate with or without a cancellous bone graft was the most common choice.

Bone Transplantation↗
PubMed1998

The extended lateral approach to the hindfoot. Anatomical basis and surgical implications.

We have recently described an extended lateral approach to the hindfoot for the operative treatment of displaced intra-articular fractures of the calcaneum. It has the advantage of avoiding damage to the sural nerve and preserving blood supply to allow prompt healing. We dissected 15 formalin-preserved cadavers, taking photographs to show the structures of the posterolateral aspect of the hindfoot and ankle. We describe a superficial and a deep triangle: the deep triangle contains a constant posterior peroneal artery which supplies the skin of the posterolateral heel. An approach designed to expose the sural nerve will divide this important artery and cause ischaemia of the posterior skin. The extended lateral approach elevates the sural nerve in a thick flap and preserves the blood supply of the skin. We have reviewed 150 consecutive patients after the use of this approach to study the indications for operation, the quality of wound healing, any damage to the sural nerve and other complications. We recommend the careful use of this approach. Our understanding of its anatomical basis has allowed us to widen the indications for its use.

Cadaver↗
PubMed1996

Routine post-traumatic radiographic screening of midfacial injuries: is one view sufficient?

Midfacial injuries are a common reason for attendance at Accident and Emergency (A&E) departments. A&E staff find these injuries difficult to assess due to limited undergraduate training in maxillofacial examination and early tissue oedema which may mask asymmetry. Patients are therefore referred for 'facial views' radiographs and commonly three views (OM15, OM30, lateral face) are taken for screening. We reviewed prospectively 137 consecutive patients over a 5-month period to determine whether one view (OM15) was sufficient to make a diagnosis in addition to clinical examination. Eighty-three per cent of patients had an accurate diagnosis from just the one view, representing a potential saving of 55 per cent of films taken. There were no fractures missed. The sensitivity was 87.5 per cent and the specificity was 83 per cent. We would suggest the introduction of a single-view facial radiograph as a safe method of screening for midfacial fracture in A&E patients where the clinical diagnosis is uncertain and provided there is no cervical injury. This would reduce costs by reducing films taken by over 50 per cent and patients' exposure to radiation.

Cost-Benefit Analysis↗
PubMed1996

A modified approach to the flexor surface of the distal radius.

Twenty-three preserved cadaver upper limbs were dissected to show the level of the nerve supply to flexor carpi radialis and the extent of exposure of a new approach to the flexor surface of the distal radius. We describe a new approach to the flexor surface of the distal radius in which both the radial artery and the median nerve are protected by muscles or tendons.

Cadaver↗
PubMed1996

The omega lateral approach to the hip.

We describe a modified lateral approach to the hip which exploits the function continuity of gluteus medius and vastus lateralis and their dense crescentic attachment to the greater trochanter. The gluteus medius is not incised or split, but is detached and mobilised with gluteus minimus as one unit. This facilitates reattachment of the glutei and helps to preserve abductor function.

Fascia Lata↗
PubMed1995

A tide of change in the management of an old fracture?

Colles' fractures are manipulated under a variety of anaesthetic techniques. An increasing awareness of cost and time within the National Health Service contributes to a marked change in the anaesthetic management of Colles' fractures. This paper presents the results of a survey of the anaesthetic techniques used in the larger accident and emergency (A&E) departments of the UK, and demonstrates the increasing popularity of the haematoma block compared with 5 years ago (7% in 1989 vs. 33% in 1994), at the expense of the general anesthetic (44% in 1989 vs 24% in 1994). The popularity of the Bier's block has remained unchanged (33% in 1989 and 1994). Local and regional anaesthetic techniques can be safely performed by A&E doctors, with appropriate monitoring, and this has beneficial resource implications for the anaesthetic department and the hospital.

Anesthesia, Conduction↗
PubMed1994

Influence of compression stockings on lower-limb venous haemodynamics during laparoscopic cholecystectomy.

Lower-limb venous haemodynamics were studied prospectively in 40 patients (24 women, 16 men of median age 52 years) undergoing laparoscopic cholecystectomy. Patients were randomized to wear compression stockings during surgery or no stockings. All received subcutaneous heparin prophylaxis. Venous capacitance and outflow were measured non-invasively before, during and after pneumoperitoneum. In the group without compression stockings (20 patients) venous capacitance and outflow decreased during pneumoperitoneum in most patients. In the group wearing stockings (20 patients) the changes were less pronounced or abolished. There was a significant difference between the groups in venous capacitance and outflow ratios at mid-operation: median (interquartile range) 0.89 (0.56-1.16) and 0.89 (0.56-1.15) respectively in the group without stockings versus 1.48 (1.09-2.19) and 1.71 (1.20-2.19) respectively in that with stockings (P < 0.001). Pneumoperitoneum creates a significant resistance to venous return. Compression stockings counteract the changes observed.

Adult↗
PubMedDate not supplied

Abnormalities in the uninvolved lower limb in children with spastic hemiplegia: the effect of actual and functional leg-length discrepancy.

We assessed the pattern of gait in children with spastic hemiplegia and a leg-length discrepancy, particularly in relation to the uninvolved limb. The kinematics of the uninvolved limbs were compared with the pattern in normal children. The uninvolved limbs in children with hemiplegia and a significant leg-length discrepancy were compared with the uninvolved limb in those children who did not have a leg-length discrepancy. We found that the involved and uninvolved legs in patients with hemiplegia had characteristic patterns that were significantly different from normal. The kinematics of the involved leg were not affected by the presence of a leg-length discrepancy. The abnormal pattern in the uninvolved limb was more exaggerated in children with a leg-length discrepancy. The abnormal sagittal plane kinematics in the uninvolved lower limb in hemiplegic children appears to be related to the presence of an actual or functional leg-length discrepancy and have not previously been described. Our findings suggest that attention be paid to the functional and actual leg-length discrepancy that exists in these children, and early consideration be given to epiphysiodesis of the uninvolved limb.

Adolescent↗