Introduction

Peroneal tendon subluxation & dislocation is a rare phenomenon. It is a commonly misdiagnosed cause of lateral ankle pain and instability.

Introduction

The exact action of the Peroneus Longus muscle on the foot is not fully understood. It is involved in a number of pathological processes like tendonitis, tenosynovitis, chronic rupture and neurological conditions. It is described as having a consistent insertion to the base of the first metatarsal, but there have also been reports of significant variations and additional slips. Our aim was to further clarify the anatomy of the main insertion of the Peroneus Longus tendon and to describe the site and frequency of other variable insertion slips.

The patella is a complex sesamoid bone within the quadriceps enhancing mechanical advantage of the extensor mechanism. Depending on activity, the patella magnifies either force or displacement; behaving as a lever, by redirecting quadriceps force it also acts as a pulley.

Peroneal tendon subluxation although rare, is a commonly misdiagnosed cause of lateral ankle pain and instability. The orientation and depth of the lateral retromalleolar groove is a major contributor to peroneal stability, but is little understood. We attempt to quantify the groove using three directional mapping techniques.

Eight age and sex matched embalmed cadaveric feet were dissected to expose the peroneal tendons and the retromalleolar groove. A hand held digitiser was used to map the version and inclination of the groove in a 3D virtual environment. The length and depth of the groove and its orientation were calculated using the cartilage boundary and the centroid of the curved surface.

Four male and four female specimens (mean age 80 Yrs) were studied. The groove was noted to be concave in 62%, flat in 25 % and concave in 12.5 %. Flatter groove were more commonly noted in (2/4) females. There was a significant difference in length and width of the groove between male and female feet. The mean length of the groove in male specimens was 6.2cm (5.4–6.7cm), and in female specimens 5.5cm (4.4–5.9cm). The mean width in males was 5.3mm (5.0–6.1mm) and in females 4.5mm (3.7–5.3mm). There was no significant difference noted in the depth of the groove between male and female feet. The mean depth in males was 2.3mm (0.8–3.1) and in female 2.2mm (0–2.4mm).

Knowledge of peroneal groove geometry in treatment of peroneal tendon instability is important. There appears to be a consistent difference in the anatomy of the groove between the sexes. Although men have longer and wider grooves than woman, the depth is the same in both sexes.

Introduction

There is a need for a standardised guideline to assist in optimal decision-making in diabetics who have acquired an ankle fracture. Through a critical analysis of the literature, a diagnostic and management algorithm that incorporates a quantitative scoring system is proposed and presented for consideration.

Our unit has pursued a policy of using donor nerves from the same limb for grafting. Nerves which have already been affected by the primary injury are selected where possible, thus avoiding any new sensory deficit.

36 of the 41 brachial plexus repairs were available for outcome data collected prospectively over 2 years. Over a nine year period, donor nerves used for the 41 brachial plexus repairs included the lateral cutaneous nerve of the forearm, superficial radial, medial cutaneous of the forearm, ulnar and sural nerves. Patients were grouped into having injured nerve grafts only (A), injured and uninjured nerve grafts (B) and uninjured nerve grafts. The repaired brachial plexus nerves were assessed by measuring the MRC grading of the power of movement of the muscle innervated by that nerve (i.e. elbow flexion for musculocutaneous nerve). These were graded as good (MRC grading 3 or better), fair (MRC grade 1 or 2), or poor (MRC 0).

The greatest success for nerve grafting was elbow flexion with good results in 22 out of 27 assessments. Using Mann-Whitney test, Group A had significantly better results (p=0.025) than group C. However, ignoring the poorer results of shoulder abduction there was no significant difference between all 3 groups of patients.

We conclude that using injured nerve grafts taken distal to the lesion in the brachial plexus is as effective as using nerve material from an uninjured limb.

Our unit has pursued a policy of using donor nerves from the same limb for grafting. Nerves which have already been affected by the primary injury are selected where possible, thus avoiding any new sensory deficit.

The exact action of the Peroneus Longus muscle on the foot is not fully understood. It is involved in a number of pathological processes like tendonitis, tenosynovitis, chronic rupture and neurological conditions. It is described as having a consistent insertion to the base of the first metatarsal, but there have also been reports of significant variations and additional slips.

Our aim was to further clarify the anatomy of the main insertion of the Peroneus Longus tendon and to describe the site and frequency of other variable insertion slips.

The course of the distal peroneus longus tendon and its variable insertion was dissected in 20 embalmed, cadaveric specimens. The surface area of the main insertion footprint was measured using an Immersion Digital Microscibe and 3D mapping software. The site and frequency of the other variable insertion slips is presented.

There was a consistent, main insertion to the infero-lateral aspect of the first metatarsal in all specimens. The surface area of this insertion was found to be proportional to the length of the foot. The insertion in males was found to be significantly larger than females. The most frequent additional slip was to the medial cuneiform. Other less frequent insertion slips were present to the lesser metatarsals.

The main footprint of the Peroneus Longus tendon is on the first metatarsal. There appears to an additional slip to the medial cuneiform frequently. Although we are unsure about the significance of these additional slips, we hope it will lead to a better understanding of the mechanism of action of this muscle and its role both in the normal and pathological foot.

Regional anaesthetic for foot surgery has been discussed as a method of post operative analgesia. Ankle block as the sole anaesthetic for foot surgery has not been extensively reviewed in the literature. We aimed to describe our experience of forefoot surgery under ankle block.

Sixty-six consecutive forefoot procedures (59 patients) were carried out under ankle block. Patients were contacted post operatively and completed a standardised questionnaire including an incremental pain assessment ranging from 0-10 (0 no pain, 10 severe pain).

Forty nine female and 10 male patients (age range 20-85y) were included. Procedures included 33 first metatarsal osteotomies, 15 cheilectomies, 3 first MTP joint replacements, 5 fusions, 4 excision of neuroma and 6 other procedures. 22 patients (33% of cases) reported discomfort during the block procedure (average pain score 1.5). 6 patients reported pain during their operation(s), average score 0.26. Average pain scores at 6, 12, 24 and 48 hours following surgery were 2.0, 3.2, 2.7 and 2.1 respectively. All patients were discharged home and walking on the same day. There were no readmissions. Each patient confirmed they would have surgery under regional block rather than general anaesthesia and would recommend this technique to family and friends.

There are many advantages in being able to perform these relatively small procedures under regional anaesthesia. The anaesthesia obtained permits the majority of forefoot procedures and provides lasting post-operative analgesia. Combined with intra-operative sedation, use of ankle tourniquet and same day discharge; it has very high patient acceptance and satisfaction.

Background

Talar neck fractures occur infrequently and are associated with high complication rates. Anatomical restoration of articular congruity is important. Adequate exposure and stable internal fixation of these fractures are challenging.

Regional anaesthetic for foot surgery has been discussed as a method of post operative analgesia. Ankle block as the sole anaesthetic for foot surgery has not been extensively reviewed in the literature.

Advantages of arthroscopic surgery in orthopaedic practice are well documented. The use and scope of ankle arthroscopy has evolved in the last decade. Its role in both the evaluation and treatment of chronic ankle pain has become more important with identification of newer pathologies. We aimed to identify the indications and complications of ankle arthroscopy in chronic ankle pain and to correlate the arthroscopic findings with pre-operative MRI/CT.

A retrospective analysis of all procedures done in our unit from 2005-2009. Patient records, X- rays and scans were reviewed. 77 patients were included in the study (46 male/31 female). The commonest age group was the 4^th decade. There was a male preponderance in the younger age group (<50y), and a female preponderance in the older age groups (>50y). The commonest indication was impingement syndrome (44%/mean age 38y), followed by osteochondral lesions of the talus (23%/mean age 36y) and Osteoarthritis (22%/mean age56y). Other pathology included synovitis, Rheumatoid Arthritis, instability, AVN and combined pathologies. Pre-op MRI scans correlated with arthroscopic findings in 59%. The pathology most missed by MRI was impingement. 1 patient developed wound infection and another iatrogenic tendon rupture. 78% reported improvement in their symptoms following the procedure.

Ankle arthroscopy is a safe and effective procedure. It is particularly useful in the diagnosis and treatment of impingement syndromes and osteochondral lesions. Although there are serious recognised complications, their incidence is low. Patients with chronic symptoms and normal MRI/CT may have treatable pathology on arthroscopy.

Bizarre parosteal osteochondromatous proliferation (BPOP) is a benign lesion of bone originally described by Nora et al in 1983. To date there are no UK-based case series in the literature. Here we present the Scottish Bone Tumour Registry (SBTR) experience of this rare lesion.

A retrospective analysis of SBTR records was performed. Histological specimens were re-examined by a consultant musculoskeletal oncology pathologist. Radiographs were re-reported by a consultant musculoskeletal radiologist. From 1983-2009, 13 cases were identified; 6 male, 7 female. Age ranged from 13-65. All patients presented with localised swelling. Pain was present in 5 and trauma in 2. 9 lesions affected the hand, 3 the foot, and 1 the tibial tuberosity. 12 lesions were excised and 1 curetted. There were 7 recurrences of which 6 were excised. 1 patients' recurrence was not treated. 1 lesion recurred a second time. This was excised. There were no metastases. Radiographs typically showed densely mineralised lesions contiguous with an uninvolved cortex. Cortical breakthrough was present in 1 case and scalloping in another. Histology characteristically showed hypercellular cartilage with pleomorphism and calcification/ossification without atypia; bone undergoing maturation; and a spindle-cell stroma.

SBTR records indicate that BPOP is a rare lesion with no sex predilection that affects patients over a wide age range. Minor antecedent trauma was present in only 2 cases. In agreement with Nora et al. we feel that trauma is unlikely to represent an aetiological factor. Recurrence was over 50% in this series. Although this is similar to that found in other reports, it may indicate that more extensive resection is required for this aggressive lesion. Finally, although radiological/histological findings are often bizarre there have been no reported metastases and so it is important that BPOP is not mistaken for, or treated as, a malignant process such as chondrosarcoma.

Regional anaesthetic for foot surgery has been discussed as a method of post operative analgesia. Ankle block as the sole anaesthetic for foot surgery has not been extensively reviewed in the literature.

We aimed to describe our experience of forefoot surgery under ankle block alone. 21 consecutive forefoot procedures (18 patients) were carried out under ankle block. The blocks were performed by the senior authors. A mixture of 10ml 2% Lidocaine with 10ml 0.5 % Bupivacaine was administered to the superficial peroneal, deep peroneal, sural and saphenous nerves. Ankle tourniquet was employed in all procedures. The patients were contacted post operatively and completed a standardised questionnaire including an incremented pain assessment ranging from 0-10 (0 no pain, 10 severe pain). 17 female and 1 male patients were contacted (age range 33-67y). Procedures included 13 first metatarsal osteotomies, 3 cheilectomies, 2 first MTP joint replacements, and 5 fusions. 14 patients requested a short acting sedative (midazolam). 5 patients (27 %) reported some discomfort during the block procedure (average pain score 1.2). No patients reported any pain during their operation(s). 4 patients (22%) required supplementation of the block. Average pain score at 6, 12, 24 and 48 hours following surgery were 0.66, 2.9, 2.4 and 1.3 respectively. All patients were discharged home and walking on the same day. None complained of nausea or required parenteral analgesia; there were no readmissions. Each patient confirmed they would have surgery under local block rather than general anaesthesia and would recommend this technique to family and friends.

Forefoot surgery under ankle block alone is safe and effective. Anaesthesia obtained permits the majority of forefoot procedures and provides lasting post-operative analgesia. Combined with intraoperative sedation, use of ankle tourniquet and same day discharge, it has very high patient acceptance and satisfaction.

The extended lateral approach offers a safe surgical approach in the fixation of calcaneal fractures. Lateral plating of the calcaneum could put structures on the medial side at risk. The aim was to identify structures at risk on the medial side of the calcaneum from wires, drills or screws passed from lateral to medial.

Ten embalmed cadaveric feet were dissected. A standard extended lateral approach was performed. The DePuy perimeter plate was first applied and 2mm K-wires were drilled through each of the holes. The medial side was now examined to determine the structures at risk through each hole. The process was repeated with the Stryker plate. The calcaneum was divided into 6 zones, by two vertical lines, from the margins of the posterior facet and a transverse line along the axis of the bone through the highest point of the peroneal tubercle.

The DePuy and the Stryker plates have 12 screw positions, 5 of which are common. With both systems, screw positions in zone 1 risk injury to the medial plantar nerve and zone 3 the lateral plantar nerve. A screw through zone 2 compromises the medial plantar in both. Screws through zone 4 risk the lateral plantar nerve with the DePuy plate. Screws through zone 5 of the DePuy plate risk the medial calcaneal nerve. Zone 5 of the Stryker plate and Zone 6 of both are safe.

There is significant risk to medial structures from laterally placed wires, drills or screws. Subtalar screws have the highest risk and have to be carefully measured and placed. The Stryker plating system is relatively safer than the DePuy perimeter plate with three safe zones out of six.

A consensus regarding management of calcaneal fractures eludes orthopaedic surgeons. While operative treatment has gained more acceptance, surgical morbidity remains high. We undertook a retrospective review of early complications and radiological outcomes following internal fixation of calcaneal fractures in our unit over 15 months.

A consecutive series of 33 patients who underwent fixation of the Calcaneus was selected. Patient records, X-rays and scans were reviewed.

37 fractures in 33 patients underwent fixation. 81 % were male. Mean age at surgery was 37yrs (19 -59yrs). 35 % were operated within 1 wk of injury and 13% after 2 wks of injury. 43% were Sanders' type III, 18% type II and 13% tuberosity avulsion fractures. 63% had a reversed/zero Bohler's angle. Mean post-op Bohler's angle was 32 degrees. Overall complication rate was 32%, with a combined deep infection rate of 8%. All patients with infection were male, and 70% were smokers. 86% were above 40yrs of age (mean 47yrs). The deep infection rate for intra-articular fractures was 3% and for tuberosity avulsion fractures 40%. Majority of patients with wound complications had been operated within 7 days of injury.

Males over 40yrs and smokers seem to be at most risk of wound complications. Time to surgery/delay in surgery up to 2 wks did not seem to have any adverse consequences. Complications increase with fracture complexity and avulsion fractures have highest risk of wound breakdown. Near anatomical restoration of the articular surface is possible in most.

Talar neck fractures are associated with high complication rates with significant associated morbidity. Adequate exposure and stable internal fixation remains challenging. We investigated the anterior extensile approach for exposure of these fractures and their fixation by screws introduced through the talo-navicular articulation. We also compared the quality and quantity of exposure of the talar neck obtained by this approach, with the classically described medial/lateral approaches.

An anterior approach to the talus between the tibialis anterior and the extensor hallucis tendons protecting both the superficial and deep peroneal nerves was performed on 5 fresh frozen cadaveric ankles . The surface area of talar neck accessible was measured using an Immersion Digital Microscribe and analysed with Rhinoceros 3D graphics package. Standard antero-medial and antero –lateral approaches were also carried out on the same ankles, and similar measurements taken. Seven talar neck fractures underwent operative fixation using the anterior approach with parallel cannulated screws inserted through the talo-navicular joint.

3D mapping demonstrated that the talar surface area visible by the anterior approach (mean 1200sqmm) is consistently superior to that visible by either the medial or lateral approaches in isolation or in combination. Medial malleolar osteotomy does not offer any additional visualisation of the talar neck. 3D reconstruction of the area visualised by the three approaches confirms that the anterior approach provides superior access to the entirety of the talar neck. 5 male and 2 female patients were reviewed. All had anatomical articular restoration, and no wound problems. None developed non union or AVN.

The anterior extensile approach offers superior visualisation of the talar neck in comparison to other approaches for anatomical articular restoration. We argue that this approach is safe, adequate and causes less vascular disruption.

The role of digital radiography has evolved in recent years. In many hospitals, radiographs have been completely digitised and moved to Picture Archiving and Communications System (PACS). Pre-operative templating for arthroplasty has been a major problem as a result.

We investigate the accuracy of Orthoview™ software in templating for hip and knee arthroplasty. A retrospective review of 20 Stryker-Exter hip and 20 Biomet-Vanguard knee arthroplasties was conducted. Anonymised preoperative radiographs were reviewed by experienced orthopaedic surgeons. Templated component sizes were compared with actual implanted component sizes. All radiographs were digitised on Kodak Carestream PACS. Five surgeons were asked to separately review the radiographs to avoid intra-observer error.

In templating for hip arthroplasty, Orthoview™ was 80% accurate in predicting the femoral stem size within one size of the actual component used. It predicted the offset with 100% accuracy. In 90% of patients, the actual head implant was within one size of the templated head. The system was able to predict the acetabular component size in only 30%. In knee arthroplasty, Orthoview™ was 80% accurate within one size of the actual component used for the femur and 90% for the tibia.

Orthoview™ enables the flexibility of digitised films to be used for pre-operative templating. It is reasonably accurate in prediction of femoral sizing in both hip and knee arthroplasty and tibial size in knee arthroplasty. It is considerably less useful for acetabular sizing. Surgeons should keep this variability in mind until more accurate systems are available.

Background: The role of digital radiography has evolved consistently over the last decade. In many European hospitals, radiographs have been completely digitised and have moved to Picture Archiving and Communications System (PACS). Pre-operative templating for arthroplasty has been a major problem with using the system.

Aims: We investigate the accuracy of the OrthoviewTM software in templating for hip and knee arthroplasty.

Methods: A retrospective review of 20 Stryker-Exter hip and 20 Biomet- Vanguard knee arthroplasties were carried out. Anonymised preoperative radiographs were reviewed by experienced orthopaedic surgeons blinded to the purpose of the study. Templated component sizes were compared with actual implant sizes used at surgery. All radiographs were digitised on Kodak Car-estream PACS. Five surgeons were asked to separately review the radiographs to avoid intra-observer error.

Results: In templating for hip arthroplasty, Orthoview TM was 80% accurate in predicting the femoral stem size within one size of the actual component used. It also predicted the offset with 100% accuracy. In 90% of the patients, the actual head implant was within one size of the templated head. The system was able to predict the acetabular component size in only 30%. In knee arthroplasty, OrthoviewTM was 80% accurate within one size of the actual component used for the femur and 90% for the tibia.

Discussion: Digital radiographs have several well documented advantages over traditional radiographs. Orthoview TM enables the flexibility of digitised films to be used for pre-operative templating. It is reasonably accurate in prediction of femoral component size in both hip and knee arthroplasty and tibial size in knee arthroplasty. It is considerably less useful for acetabular sizing. Surgeons have to keep this variability in mind until more accurate systems are available.

Background: The Calcaneus is the largest of the tarsal bones. 2% of all adult and 60 % of all tarsal fractures involve the Calcaneus. A true consensus regarding the management of these fractures still eludes orthopaedic surgeons. While operative treatment for displaced fractures has gained more acceptance in the last decade, surgical morbidity still remains high.

Aim: A retrospective review of the early complications and radiological outcomes following open reduction and internal fixation of displaced calcaneal fractures in our unit over the last 15 months.

Methods: A consecutive series of 33 patients who underwent surgical fixation of the Calcaneus was selected. Patient records, X rays and scans were reviewed. Mode and nature of injury, life style factors, surgical complications and Bohler’s angles were analysed.

Results: 37 fractures in 33 patients underwent operative fixation. 81 % were male. Mean age at surgery was 37yrs (range19–59). 35 % were operated within 1 week of the injury and 13% after 2 weeks of injury. 43% were Sanders’ type III, 18% type II and 13% tuberosity avulsion fractures. 63% of patients had a reversed or zero Bohler’s angle. Mean post-op Bohler’s angle was 32 degrees. Overall complication rate was 32%, with a combined deep infection rate of 8%. All patients with infection were male, and 70% were smokers. 86% were above 40yrs of age (mean 47yrs). The deep infection rate for intra-articular fractures was 3% and for tuberosity avulsion fractures 40%. Majority of patients with wound complications had been operated within 7 days of injury. 4 patients had persisting pain requiring removal of metal work.

Discussion: Our study highlights that there are significant risks associated with operative management of calcaneal fractures. Male patients over the age of 40yrs who are smokers seem to be at most risk of wound complications. Time to surgery or delay in surgery up to 2 weeks did not seem to have any adverse consequences. Complications increase with fracture complexity, and avulsion fractures have a high risk of wound breakdown. Near anatomical restoration of the articular surface is possible in most cases.