Purpose

To establish the early outcome, satisfaction and complications of sinus tarsi implants in the management of symptomatic flexible flatfeet for a paediatric population

Aim

Historically, surgeons have focused on isolated simple coalition resection in symptomatic tarsal coalition with concomitant rigid flat foot. However, recent evidence suggests that coalitions with severe preoperative planovalgus malposition treated with resection alone are associated with continued disability and deformity. We believe that concomitant severe flatfoot should be considered as much as a pathological component and pain generator as the coalition itself. Our primary hypothesis is that simple resection of middle facet tarsal coalitions and simultaneous flat foot reconstruction can improve clinical outcomes.

Introduction

Historically, surgeons have focused on isolated simple coalition resection in symptomatic tarsal coalition with concomitant rigid flat foot. However, a review of literature suggests that coalitions with severe preoperative planovalgus malposition treated with resection alone are associated with continued disability and deformity. We believe that concomittant severe flatfoot should be considered as much as a pathological component and pain generator as the coalition itself. Our primary hypothesis is that simple resection of middle facet tarsal coalitions and simultaneous flat foot reconstruction can improve clinical outcomes.

Background

Surgical resection of middle facet tarsal coalition is a well documented treatment option in symptomatic individuals that do not respond to conservative treatment. The ability to return to full recreational activity post resection may have implications on foot biomechanics and possibly degenerative changes in the subtalar and adjacent joints.

Painful peroneal spastic flatfeet without coalition or other known etiologies in adolescence, remains a difficult condition to treat. We present eight such cases with radiological and surgical evidence of bony abnormalities in the lateral subtalar region just anterior to the posterior facet.

All patients had presented as tertiary referrals with recalcitrant pain and had undergone a trial of orthotics and physiotherapy. Diagnostic workup included a clinical and radiographic evaluation. Clinical examination consisted of gait examination, foot alignment, range of motion, torsional profile of the lower limbs and marking of symptomatic foci. All patients had standing weightbearing anteroposterior and lateral projections of the foot and ankle, CT and/or MRI scans of the foot. Coalitions and other known intra-articular pathologies like subtalar arthritis were ruled out. All patients had bilateral flatfeet but unilateral peroneal spasm.

All patients had an accessory anterolateral talar facet (ATF) which was arising as an anterior and distal extension of the lateral process of the talus. This caused lateral impingement between the facet and the calcaneum, confirmed by bone edema around the sinus tarsi and marked at the apex of the angle of Gissane on MRI scans. All patients had stiff subtalar joints with very limited movement under anaesthesia, indicating peroneal muscle contracture. Patients were treated with a combination of facet excision, fractional peroneal and gastrosoleus lengthening and calcaneal lengthening to correct the flatfoot and prevent lateral impingement.

To assess healing pattern of Achilles tendons across the gap created by a percutaneous tenotomy and maintained by cast in club feet.

Twenty-one tenotomies in 16 patients (Age range 12 weeks-36 months) were monitored with dynamic and static ultrasonographic studies. Ultrasounds were performed before and immediately after tenotomy and at approximately 3, 6 and 12 weeks post tenotomy. Cast removal was done at three weeks. Two patients above age of two were casted for 6 weeks.

The healing pattern went through different phases although they were not distinctively exclusive from each other and did show considerable overlap. First phase showed formation of a bulbous mass with some continuity of scar tissue across tendon gap. The transition zone between new fibre and the original tend quite distinct. However dynamic ultrasound showed the Achilles tendon moved as a single unit. Second phase showed fibres resembling normal tendon crossing the gap and reduction of bulbous mass. The transition zone was still discernible. Final stage demonstrated more homogenous fibres of Achilles tendon with an indistinct transition zone.

Two older children showed a distinctly longer process of healing.

One child showed an irregular mass of fluid and soft tissue structures in the gap at six weeks.

The other child demonstrated a relative reduction in the proportion of tendon fibres across the gap.

At 12 weeks there was evidence of continuation of tendon fibres, but transition zone partly visible.

We present a case control comparison between two methods of fixation for 1st metatarsophalangeal (MTPJ) fusion. From 2007–2008 sixty patients were treated with either 4.0mm ACE (De Puy) screws or a Hallu-fix (Integra LifeSciences) plate fixation. We found no difference between the two groups in regard to age, ASA grade, smoking status and non-steroidal antiinflammatory use but there was a statistically significant difference in union rates. In the Hallu-fix group, nine patients went on to develop a non-union whereas one patient developed a non-union in the ACE screw fixation group, p = 0.01. Whilst there may be perceived advantages with the Hallu-fix system in regard to the accuracy of reduction, from our results we caution against it’s use, and have found a better outcome with cheaper 4.0mm ACE screws.

We performed a prospective ultrasonographic study of tendon healing following Ponseti-type Achilles tenotomy in 27 tendons (20 patients) with idiopathic congenital talipes equinovarus. Serial ultrasound examinations (both static and dynamic) were performed at 3, 6 and 12 weeks post-operatively. Casts were removed routinely 3 weeks post-tenotomy apart from two patients over 24 months of age who remained immobilised for 6 weeks. We observed three differing phases of healing apparent at 3, 6 and 12 weeks post tenotomy. We defined the end point of healing as the observation of tendon homogeneity across the gap zone on ultrasonography. This transition to normal ultra-structure was frequently seen by ultrasonography only at 12 weeks, when the divided ends of the tendon were indistinct. Though there is evidence of continuity of the tendon at the time of cast removal, it remains in the mid-phase of healing. The time taken for complete healing should be considered prior to planning a revision tenotomy.

In two children over the age of 2 years, who had repeat tenotomy, the completion of healing by our criteria took longer than 12 weeks. The tendon gap healing does not appear to occur as readily in children over two years and other Methods: may be preferable to percutaneous tenotomy.

Aim: Assess healing pattern of Achilles tendons across gap created by percutaneous tenotomy and maintained by cast in club feet.

Methods and Results: 21 tenotomies in 16 patients (Age range 12 weeks–36 months) were monitored with dynamic and static ultrasonographic studies. Ultrasounds performed before, immediately after and at approximately 3, 6, 12 weeks post tenotomy. Cast removal was done at 3 weeks. Two patients above age of two were casted for 6 weeks.

The healing pattern went through different phases although they were not distinctively exclusive from each other and did show considerable overlap. First phase showed formation of bulbous mass with some continuity of scar tissue across tendon gap. The transition zone between new fibre and the original tend quite distinct. However dynamic ultrasound showed the Achilles tendon moved as a single unit. Second phase showed fibres resembling normal tendon crossing the gap and reduction of bulbous mass. The transition zone was still discernible. Final stage demonstrated more homogenous fibres of Achilles tendon with an indistinct transition zone. Two older children showed a distinctly longer process of healing.

At 3 weeks there was no evidence of healing.

Conclusion: Young Child (< 1 Year): When cast immobilisation is discontinued, the tendon is in mid phase of healing. There may be a positive effect on continued improvement in dorsiflexion while using boots and bars.

Older Child-Safe to consider percutaneous tenotomy in children up to 3 years of ages provided the period of immobilisation is extended.

Purpose of study: To compare our practice of paediatric foot and ankle surgery with other hospitals in the UK and to assess the safety and patient satisfaction of day-case procedures on an afternoon list.

Methods and Results: A postal questionnaire was sent to 135 consultant members of BSCOS to identify which foot and ankle operations were being performed as inpatients (“Major surgery”) and day-cases (“Minor surgery”). We received 87 (64%) replies over 3 months. The survey revealed that certain procedures were being performed as a day-case in fewer than 35% of centres in the UK. These included excision of tarsal coalitions, tendon transfers, metatarsal osteotomies and open posterior releases for equinus. These same procedures are performed routinely as day-cases at Birmingham Children’s Hospital.

We focussed on a single surgeon series with a once weekly afternoon operating list. We identified 24 “major operations” on 19 patients that were performed as a day case over 21 months. The parents of each patient were contacted by telephone to complete a satisfaction survey. We demonstrate that there were no problems that should have warranted an inpatient stay.

Conclusions: Most paediatric foot and ankle surgery can be performed satisfactorily as a day case which has obvious cost implications for the NHS. Although this is an accepted practice among adults, the majority of paediatric orthopaedic units are yet to accept this protocol.

Aim: To assess the healing pattern of Achilles tendons across the gap created by a percutaneous tenotomy and maintained by cast in club feet.

Methods and Results: 21 tenotomies in 16 patients (Age range 12 weeks-36 months) were monitored with dynamic and static ultrasonographic studies Ultrasounds were performed before and immediately after tenotomy and at approximately 3, 6 and 12 weeks post tenotomy. Cast removal was done at three weeks. Two patients above age of two were casted for 6 weeks.

The healing pattern went through different phases although they were not distinctively exclusive from each other and did show considerable overlap. First phase showed formation of a bulbous mass with some continuity of scar tissue across tendon gap. The transition zone between new fibre and the original tend quite distinct. However dynamic ultrasound showed the Achilles tendon moved as a single unit. Second phase showed fibres resembling normal tendon crossing the gap and reduction of bulbous mass The transition zone was still discernible. Final stage demonstrated more homogenous fibres of Achilles tendon with an indistinct transition zone.

Two older children showed a distinctly longer process of healing. One child showed an irregular mass of fluid and soft tissue structures in the gap at six weeks The other child demonstrated a relative reduction in the proportion of tendon fibres across the gap At 12 weeks there was evidence of continuation of tendon fibres, but transition zone partly visible.

Conclusion: Ours study demonstrates when cast immobilisation is discontinued, the tendon is in mid phase of healing. This may have positive effect on continued improvement in dorsiflexion while using boots and bars. It is safe to consider percutaneous tenotomy in children up to 3 years of ages provided the period of immobilisation extended

Purpose: We evaluated the role of the Distal Tibial Line (DTL by Saltzman et al, 2005) in measuring the pre-operative and postoperative position of the talus on ‘lateral’ radiographs following a Total Ankle Replacement (TAR). Currently there is no validated measure of anteroposterior (AP) alignment of a TAR.

Arthritis in the ankle causes considerable malalignment in the anteroposterior plane. The DTL is not affected by the destruction of the tibiotalar joint and is independent of slight variations in the positioning of the foot and radiological magnification.

Method: DTL divides the talus into two sections and the proportionate length of the posterior segment is presented as a ratio. The size of the posterior segment and ratio decreases with anterior subluxation.

Radiographs of 200 cases of TAR were reviewed. The anterior and posterior outlines of the talus could not be seen in all cases (e.g. preoperative talonavicular fusion). As a result 49 cases of inflammatory arthritis (49 of 119) and 6 of osteoarthritis (6 of 81) could not be assessed.

Results: The osteoarthritic ankle (OA) in particular showed a tendency for anterior subluxation. The average ratio in OA cases increased from ‘34.8′ before surgery to ‘40.4’ after surgery, confirming a trend for this subluxation to reduce with a TAR.

There was a lesser tendency for subluxation in the inflammatory group of patients although the body of the talus itself was more deformed. The average preoperative value was ‘36.1’ and the post operative value was ‘38.9’.

Conclusion: We found the Distal Tibial line to be a reproducible parameter for measurement of AP alignment in TAR in the vast majority of OA cases. The change of anteroposterior alignment post surgery appears to be due to the restoration of soft tissue balance.

We describe the medium-term results of a prospective study of 200 total ankle replacements at a single-centre using the Scandinavian Total Ankle Replacement. A total of 24 ankles (12%) have been revised, 20 by fusion and four by further replacement and 27 patients (33 ankles) have died. All the surviving patients were seen at a minimum of five years after operation. The five-year survival was 93.3% (95% confidence interval (CI) 89.8 to 96.8) and the ten-year survival 80.3% (95% CI 71.0 to 89.6).

Anterior subluxation of the talus, often seen on the lateral radiograph in osteoarthritic ankles, was corrected and, in most instances, the anatomical alignment was restored by total ankle replacement. The orientation of the tibial component, as seen on the lateral radiograph, also affects the position of the talus and if not correct can hold the talus in an abnormal anterior position. Subtalar arthritis may continue to progress after total ankle replacement. Our results are similar to those published previously.

70 patients who underwent dynamic MRI scanning for chronic anterior knee pain were retrospectively evaluated. All patients had been symptomatic for over a year. 43 patients had been treated conservatively and 27 had undergone surgical procedures (arthroscopy -13, lateral release- 9, tibial tubercle transfer 5). The extent of subluxation, tilt and cartilage abnormalities on MRI scans, during resisted extension were assessed. Functional scoring (Oxford, Lysholm and Tegner scores) was done through questionnaires and correlated with the radiological findings.

54 (77%) patients were found to have some patellofemoral abnormality on the scans. Subluxation was the most common finding with mild subluxation in 30, moderate in 18 and severe in 17 knees. Mild tilt was seen in 26 knees and moderate to severe tilt in 14 knees. Tilt was found in association with subluxation except in 8 cases. Grade 1 and 2 cartilage wear were seen in 13 knees and Grade 3 and 4 in 21 knees.

The “Tibial Tubercle to Trochlear Groove distance” (TTD) was measured in all knees and correlated with subluxation. The average distance was 13.5mm, 13.6mm and 18.8mm for mild, moderate and severe subluxation respectively. All patients with a TTD _ 20mm had moderate or severe subluxation. The specificity of a TTD _ 20mm for severe maltracking was 100% but the sensitivity was only 42%.

The TTD appears to be the single most significant parameter determining patella tracking. We have proposed an algorithm for the surgical and non-surgical treatment of chronic anterior knee pain. We recommend lateral release for those with moderate and severe subluxation and a tibial tubercle transfer as well in those with a TTD _ 20mm. The functional scores did not zshow a significant correlation with the grading of subluxation.

Purpose of the study: To develop a new treatment algorithm for patients with chronic anterior knee pain based on kinematic patella tracking MR imaging.

Methods and Results: Patients with anterior knee pain of more than one year duration and not responding to non-operative treatment, underwent kinematic MRI study. The provocative test was performed with the conventional MRI scanner and the patient extending the knee against resistance, the resistance provided by inflated beach ball. A retrospective analysis was done of first seventy patients, who had undergone this scanning technique.

On the imaging films, four measurements were made. They were patella subluxation, tilt, cartilage thickness and the Tibial Tubercle Trochlear distance (TTD). Patellar subluxation was classified as mild, moderate and severe. We found that a Tibial Tubercle Trochlea distance of 18mm had a specifity of 100% and a sensitivity of 89% for severe maltracking.

Conclusion: Kinematic MR Imaging is a useful investigation before considering operative treatment for patients with chronic anterior knee pain. Based on our study, we conclude that those patients with moderate lateral maltracking with a TTD< 18 mm should be offered lateral release and those with severe maltracking and TTD> 18mm should have a tibial tubercle transfer, in addition to lateral release.

Purpose of the study: To develop a new treatment algorithm for patients with chronic anterior knee pain based on kinematic patella tracking MR imaging.

Methods and Results: Patients with anterior knee pain of more than one year duration and not responding to non-operative treatment, underwent kinematic MRI study. The provocative test was performed with the conventional MRI scanner and the patient extending the knee against resistance, the resistance provided by inflated beach ball. A retrospective analysis was done of first seventy patients, who had undergone this scanning technique.

On the imaging films, four measurements were made. They were patella subluxation, tilt, cartilage thickness and the Tibial Tubercle Trochlear distance (TTD). Patellar subluxation was classified as mild, moderate and severe. We found that a Tibial Tubercle Trochlea distance of 18mm had a specifity of 100% and a sensitivity of 89% for severe maltracking.

Conclusion: Kinematic MR Imaging is a useful investigation before considering operative treatment for patients with chronic anterior knee pain. Based on our study, we conclude that those patients with moderate lateral maltracking with a TTD< 18 mm should be offered lateral release and those with severe maltracking and TTD> 18mm should have a tibial tubercle transfer, in addition to lateral release.