The effect of ankle and hindfoot malalignment on foot mechanics in patients suffering from post-traumatic ankle osteoarthritis.

BACKGROUND: Ankle and hindfoot malalignment is a common finding in patients suffering from post-traumatic ankle osteoarthritis. However, no studies have addressed the effect of concomitant foot deformities on intrinsic foot kinematics and kinetics. Therefore, the objective of this study was to investigate the effect of ankle and hindfoot malalignment on the kinematics and kinetics of multiple joints in the foot and ankle complex in patients suffering from post-traumatic ankle osteoarthritis. METHODS: Twenty-nine subjects with post-traumatic ankle osteoarthritis participated in this study. Standardized weight-bearing radiographs were obtained preoperatively to categorize patients as having cavus, planus or neutral ankle and hindfoot alignment, based on 4 X-ray measurements. All patients underwent standard gait assessment. A 4-segment foot model was used to estimate intrinsic foot joint kinematics and kinetics during gait. Statistical parametric mapping was used to compare foot kinematics and kinetics between groups. FINDINGS: There were 3 key findings regarding overall foot function in the 3 groups of post-traumatic ankle osteoarthritis: (i) altered frontal and transverse plane inter-segmental angles and moments of the Shank-Calcaneus and Calcaneus-Midfoot joints in the cavus compared to the planus group; (ii) in cavus OA group, Midfoot-Metatarsus joint abduction sought to compensate the varus inclination of the ankle joint; (iii) there were no significant differences in inter-segmental angles and moments between the planus and neutral OA groups. INTERPRETATION: Future studies should integrate assessment of concomitant foot and ankle deformities in post-traumatic ankle osteoarthritis, to provide additional insight into associated mechanical deficits and compensation mechanisms during gait.

Clinical assessment of 115 cases of hindfoot fusion with two different types of graft: Allograft+DBM+bone marrow aspirate versus autograft+DBM.

INTRODUCTION: Nonunion is a common complication (15%) of hindfoot and ankle arthrodesis. Autograft can improve the fusion rate because of its osteoconductive, osteoinductive and osteogenic properties. However, autograft harvesting is a source of morbidity. One alternative is to combine allograft with demineralized bone matrix (DBM) and iliac bone marrow aspirate (BMA). This combination graft has similar biological properties to healthy bone. When used alone, allograft has osteoconductive and sometimes structural properties. DBM provides osteoinduction and improves the osteconductivity. BMA adds cells and thereby osteogenic potential. HYPOTHESIS: Given its intrinsic properties, allograft-DBM-BMA is as effective as autograft-DBM treatment while simplifying the clinical practice. MATERIAL AND METHODS: One hundred and fifteen cases of ankle and hindfoot arthrodesis were studied in 82 patients divided in two groups: autograft-DBM vs allograft-DBM-BMA. Treatment effectiveness was assessed using clinical (time to fusion, fusion rate) and radiological (trabecular bone bridge, disappearance of joint space) criteria. A CT scan was done in 60% of cases when fusion could not be confirmed using the clinical and radiological criteria. RESULTS: There was no significant difference between the two groups in terms of fusion rate, time to fusion, number of heterotopic ossifications, revision rate and quantity of DBM used. The nonunion rate was 18% in the autograft group and 13% in the allograft group. The infection rate was 11% in the autograft and 4% in the allograft group. DISCUSSION: Allograft-DBM-BMA is an alternative to autograft-DBM that provides similar effectiveness without increasing the number of nonunion or complications. Osteonecrosis and surgical revision are risk factors. LEVEL OF EVIDENCE: III retrospective study.

Scarf osteotomy without internal fixation to correct hallux valgus.

Scarf osteotomy of the first metatarsal bone to correct hallux valgus deformity has benefited from a number of improvements over the past two decades, most notably regarding the internal fixation method. Internal fixation was deemed mandatory by the authors of early case-series studies. Maestro suggested eliminating the proximal screw by locking the two fragments distally: a notch was created via a medial extension of the cephalic part of the osteotomy, the plantar fragment was displaced laterally, and the distal end of the proximal fragment was then fit into the notch (secondary cut and interlocking joint technique). To further develop this concept and to increase the potential range of translation, we developed an original technique involving distal locking without shortening and proximal stabilisation by impaction of a cortical-cancellous bone graft taken from the medial overhanging edge of the proximal fragment. This original technical variant has not been reported previously.

Posterior arthroscopic subtalar arthrodesis: ten cases at one-year follow-up.

BACKGROUND: Isolated subtalar arthrodesis is the treatment of choice for several conditions -mostly subtalar arthritis, tarsal coalition and posterior tibial tendon dysfunction- unresponsive to conservative treatment. Arthroscopic procedures are an interesting recent alternative, less invasive than conventional open techniques. Posterior arthroscopy, in prone position, could be more advantageous than the conventional lateral and/or anterior approach. PATIENTS AND METHODS: Ten cases, from 20 to 59-years-old, were prospectively followed up for minimum of one-year (range 12 to 31 months). Arthritis and tarsal coalition were the most common indications. RESULTS: Fusion was observed in all cases at a maximum of nine weeks. Mean average AOFAS score improved from 47 to 78. No complications were noted related to the technique. Only two patients, operated for a symptomatic subtalar coalition, complained of some residual pain due to a lateral submalleolar impingement. Interest of preservation of vascular talar supply and bone grafting are discussed. CONCLUSION: The good results using this innovative technique are encouraging. Long-term randomized studies remain necessary to confirm the reliability of the procedure in these different indications, and the type of bone graft to favour, if really needed. LEVEL OF EVIDENCE: Level IV therapeutic study.

Diabetic foot: the orthopedic surgery angle.

As diabetes takes on pandemic proportions, it is crucial for the orthopedic surgeon to be aware of the issues involved in diabetic foot. Ulceration is related to neuropathy and to arterial disease, a vital prognostic factor for healing; infection plays an aggravating role, increasing the risk of amputation. At-risk feet need to be screened for. Ulcer classification is essential, to set treatment strategy and determine prognosis. Before any treatment is decided on, neuropathy, vascular insufficiency and infection should individually be assessed by clinical examination and appropriate additional work-up. Despite the International Consensus on the Diabetic Foot recommendations, management of diabetic foot in Europe still varies greatly from country to country, very few of which have established reference centers. Management of diabetic foot remains multidisciplinary; but it has been shown that the orthopedic surgeon should play a central role, providing a biomechanical perspective so as to avoid complications recurrence. Strategy notably includes prevention of at-risk foot, revascularization surgery (which should systematically precede orthopedic surgery in case of critical vascular insufficiency), and treatment of ulcers, whether these latter are associated with osteitis or not. Indications for "minor" amputation should be adequate, and meticulously implemented. "Acute foot" is a medical emergency, entailing massive empirically selected I.V. antibiotics to "cool" the lesion. Prophylactic surgery to limit further risks of ulceration is to be indicated with caution and only when clearly justified. France urgently requires accredited specialized multidisciplinary centers to manage severe lesions: deep and infected ulceration, advanced arteriopathy, and Charcot foot arthropathy.

Plantar pressure relief using a forefoot offloading shoe.

AIM: To assess the effectiveness of the Barouk(®) second-generation postoperative forefoot relief shoes during appropriate use of the shoe on healthy subjects. MATERIALS AND METHODS: A convenience sample of 35 volunteer subjects (17 women, 18 men) was recruited to participate in this study. Dynamic foot loading was evaluated with inshoe plantar pressure measurements. Subjects were asked to walk two trials at a self-selected speed: (a) in their mass-produced shoes to assess baseline pressure values, defined as 100% and (b) with the Barouk(®) postoperative shoe on the right foot and their own shoe on the left side. Data analysis was tested for statistical differences with paired Student's t-tests (with p<0.05 as a significance level). RESULTS: The Barouk(®) second-generation postoperative forefoot relief shoes relieved forefoot pressure in all trials. For all 35 volunteers, there was a 79-96% mean peak pressure reduction (p<0.001) of the forefoot except for the fifth metatarsal head during appropriate use of the postoperative shoe. In contrast to the results for the forefoot, a significant increase of the peak pressure values was observed in the heel region. Similar findings were observed for the pressure-time integral values. CONCLUSION: The data of our study provide evidence that the second-generation Barouk(®) shoe relieve pressure of the forefoot with appropriate use.

Tarsal tunnel syndrome and flexor hallucis longus tendon hypertrophy.

Tarsal tunnel syndrome (TTS) defines an entrapment neuropathy of the posterior tibial nerve or one of its branches, within the tarsal tunnel. Numerous etiologies have been described explaining this entrapment, including trauma, space-occupying lesions, foot deformities, etc. We present an unreported cause of a space-occupying lesion in the etiology of TTS, namely the combination of a hypertrophic long distally extended muscle belly of the flexor hallucis longus and repetitive ankle motion. Surgical debulking of the muscle belly in the posterior ankle compartment resolved all symptoms.

Technique and early experience with posterior arthroscopic tibiotalocalcaneal arthrodesis.

Tibiotalocalcaneal arthrodesis is indicated for pain relief in patients with combined arthritis of the ankle and subtalar joint. An arthroscopic posterior approach was designed to improve upon traditional methods by using a minimally invasive technique. The technique involves prone positioning of the patient, one anterolateral and two posterolateral portals, and arthroscopic debridement of both the tibiotalar and posterior talocalcaneal joint. Stabilisation is obtained with a retrograde intramedullary nail, with static interlocking. This article presents illustrative cases and discusses some of the technical advantages and disadvantages over conventional open surgery. For surgeons familiar with posterior ankle or subtalar arthroscopy, this minimally invasive debridement and nailing appears to offer superior exposure, high patient satisfaction and lower postoperative morbidity than traditional methods; fusion is encouraged by preserving the medullary reaming material at the site of the fusion.

The effects of total ankle replacement on gait disability: analysis of energetic and mechanical variables.

PURPOSE: The goal was to evaluate the effect of total ankle replacement (TAR) on gait in terms of mechanical and energetic variables. METHODS: An observational, prospective study was undertaken in 20 patients before and approximately 7 months after unilateral mobile-bearing TAR. The clinical-functional level was assessed according to the American Orthopaedic Foot and Ankle Society 'AOFAS'. An instrumented motion analysis was used to assess spatiotemporal parameters, ankle kinematics, mechanical work, and electromyographic activity. Energy expenditure was analyzed using an ergospirometer. RESULTS: AOFAS score improved 1.5 times. The speed was also significantly improved. In order to limit the influence of speed and to highlight the effect of the surgery, all variables were normalized by z-score to isolate the effect of TAR. With normalized z-score, spatiotemporal parameters and ankle amplitude instance were significantly improved. The vertical center of mass displacement was significantly improved, showing a less flat-walking pattern, and decreasing energy expenditure. Our results show that TAR has a beneficial effect on locomotor function. CONCLUSIONS: Many studies have shown that improved clinical outcomes can be expected with the new generation of prostheses and this was as confirmed by our study. However, no previous study has investigated the effect of TAR on the functional limitations of gait as represented by mechanical and energetic variables.

[Hallux valgus surgery in 2005. Conventional, mini-invasive or percutaneous surgery? Uni- or bilateral? Hospitalisation or one-day surgery?]. / La chirurgie de l'hallux valgus en 2005. Chirurgie conventionnelle, mini-invasive ou percutanée ? Uni- ou bilatérale ? Hospitalisation ou ambulatoire ?

There remains a good deal of controversy concerning forefoot surgery. Certain concepts such as conventional procedures, minimally invasive surgery, or percutaneous surgery are promoted because of their specific advantages including rapid recovery and compatibility with a short hospital stay or even outpatient surgery. Nevertheless, in 2005 many questions remain unanswered and highly variable practices have been basically founded on personal experience rather than scientific evidence. In addition, financial and lobbying pressure appears to have an influence on our choices, affecting the freedom of our therapeutic decision-making. Developed over a long period, conventional surgery has proven reliability, reproducibility and adaptability. Procedures termed minimally invasive are defined by the limited incision. Percutaneous surgery is not less invasive than other procedures; the techniques are performed under indirect visual control and often assisted with more or less sophisticated radioscopic techniques depending on the surgeon's own experience. In our opinion, percutaneous surgery should be considered as a new concept based on rapid and functional results. Patients often raise the question of a bilateral procedure. For hallux valgus, there is no consensus on whether unilateral or bilateral procedures are better, the best solution depending on postoperative weight bearing and thus on the technique employed. From a cost expenditures point of view, bilateral procedures have an impact. For the advantages in terms of macroeconomy for professional incapacity, the question is less univocal for healthcare authorities. Advances in perioperative anesthesia and analgesia have enabled a broader approach to ambulatory surgery. Outpatient surgery appears to have benefits in terms of organization and economics. Variables studied were as follows: duration of hospital stay, postoperative edema, number of days of sick leave and preoperative and early and late postoperative pain. Patients who underwent minimally invasive procedures had a significantly shorter hospital stay compared with three other groups. For bilateral procedures, hospital stay on average was longer than in the two other groups. There was no correlation between postoperative edema and pain or between the degree of edema at 15 days and two months. Mean sick leave was 54.6 days. This was significantly shorter for percutaneous procedures compared with conventional surgery or minimally invasive techniques. Preoperative pain was noted four to five on the Visual Analogue Scale (VAS). There was no significant difference between the different groups as a function of the type of surgery performed. Statistically, there is very little difference in the short term between the different techniques. A much longer study would be necessary to obtain evidence to guide our practices. While there is certainly no reason to condemn one method or another, surgeons must be careful about the promises given to patients which are generally based on personal experience but not necessarily supported by rigorous scientific data.

[Tarsal osteoarthritis: a rare localisation of tuberculosis]. / Ostéoarthrite tarsienne: une localisation rare de la tuberculose.

We report the case of a 39-year-old woman with an uneventful medical history who presented an inflammatory left foot with no notion of trauma or fever. The plain x-ray and magnetic resonance imaging demonstrated talonavicular and subtalar osteoarthritis. A surgical biopsy with excision of inflammatory and necrotic tissue and removal of a fistular tract was performed. Histology revealed the presence of granulomas with caseous central necrosis suggesting tuberculosis of the bone. The diagnosis was confirmed when bacteriology samples grew Mycobacterium tuberculosis. Antituberculosis drugs were administered for twelve months. At 24 months, the patient presents a painful stiff rear foot after the development of secondary talonavicular degeneration. This case illustrates a particular clinical presentation of tuberculosis. This diagnosis should be considered in the presence of atypical bony lesions with a chronic course. Early diagnosis enables proper therapeutic management. Useful diagnostic imaging techniques include plain x-rays, computed tomography, and magnetic resonance imaging. Certain diagnosis is based on bacteriological and histological examinations.

[Congenital club foot: treatment in childhood, outcome and problems in adulthood]. / Le pied bot varus equin: traitement chez l'enfant et devenir a l'age adulte.

PURPOSE OF THE SYMPOSIUM: Treatment of idiopathic talipes varus, or congenital clubfoot, is designed to re-align the foot to alleviate pain and allow plantigrade weight bearing with adequate joint motion despite the subnormal radiographic presentation. This symposium was held to review current management practices for congenital clubfoot in children and to analyze outcome in adults in order to propose the most appropriate therapeutic solutions. MANAGEMENT OF CONGENITAL CLUBFOOT IN CHILDREN: Idiopathic talipes varus can be suspected from the fetal ultrasound. Parents should be given precise information concerning proposed treatment after birth. Deviations must be assessed in the newborn then revised regularly using objective scales during and after the end of treatment. This enables a better apprehension of the evolution in comparison with the severity of the initial deformation. Conservative treatment is proposed by many teams: a functional approach (rehabilitation and minimal use of orthetic material) or the Ponseti method (progressive correction using casts associated with percutaneous tenotomy of the calcaneal tendon) are currently preferred. If such methods are insufficient or unsuccessful, surgery may be performed as needed at about 8 to 11 months to achieve posteromedial release. Good results are obtained in 80% of patients who generally present minimal residual deformations (adduction of the forefoot, minimal calcaneal varus, residual medial rotation, limitation of dorsal flexion), which must be followed regularly through growth. The difficulty is to distinguish acceptable from non-acceptable deformation. At the end of the growth phase, severe articular sequelae are rare (stiff joint, recurrence of initial deformation, overcorrection) but difficult to correct surgically: osteotomy, tendon transfer, double arthrodesis, Ilizarov fixator. Gait analysis is essential to quantify function and obtain an objective assessment of the impact on higher joints, providing valuable guidance for surgical correction. OUTCOME IN ADULTHOOD: There have been very few studies evaluating the long-term functional outcome after treatment during childhood. According to two studies presented at this symposium (Brussels, Lausanne), results have been generally good but with subnormal radiographs irrespective of the type of treatment or how early treatment started in childhood. Hypoplasia of the talar dome is a constant finding and is correlated with limitation of dorsal flexion of the ankle joint. A small degree under-correction is often observed but well tolerated while overcorrection is generally less well tolerated. Functional outcome depends highly on preservation of subtalar joint motion. There have been no reports on the results of treatment of sequelae in adults. Most problems (pain, stiffness, osteoarthritis) are observed in the mid or rear foot. Indications for conservative surgery (osteotomy) of the mid or rear foot are rare compared with indications for combined arthrodesis. Talocrural decompensation is a turning point observed in the adult. Management at this point is difficult: fusion of the ankle worsens the situation by increasing the stress on the forefoot and aggravating the disability; implantation of an ankle prosthesis is technically difficult and remains to be fully developed. Treatment of the dorsal bunion of the great toe may require tendon transfer and/or fusion. CONCLUSION: A child born with clubfoot will never have a normal foot in adulthood. Sequelae present at the end of growth will intensify during adult life; under-correction is easier to treat in adulthood than overcorrection. The most difficult problems in adulthood are: neglected clubfoot, over correction, and degradation of the talocrural joint.

[Reconstruction of the loss of bone substance of the forearm by cubitalization of the radius (one bone forearm). Apropos of 6 cases]. / La reconstruction des pertes de substance osseuse de l'avant-bras par cubitalisation du radius (one bone forearm). A propos de six observations.

Extensive forearm bone loss, whatever its etiology, presents a difficult reconstruction problem. This is mainly the case in the presence of lesions of the interosseous membrane associated with the radio-ulnar joint. When preservation of forearm rotation is not possible, cubitalization of the radius and reconstruction of the forearm by creation of a "one bone forearm" seems to be an excellent salvage technique both functionally and cosmetically. Our experience concerns six clinical cases; two of these cases are original and give the authors the opportunity to describe a new reconstructive technique of the distal humerus and elbow by vascularized transfer of the radius onto the radial artery (with a cutaneo-osseous transfer in one case). The etiology of the bone defect included severe trauma in three cases, and a Volkman's syndrome complicated by osteomyelitis in one case. Two cases represent an original technique of reconstruction of the distal humerus by a vascularised transfer of the radius onto the radial artery. Forearm reconstruction is performed by cubitalization of the radius. The etiology was traumatic in one case and neoplastic in another, and a cutaneo-osseous transfer was performed in the latter case. In this difficult problem of bone reconstruction, a favorable functional and cosmetic result was obtained in our series.

[New metacarpal osteotomy: metacarpal cervicocapital shortening osteotomy of the rheumatoid hand]. / Nouvelle ostéotomie métacarpienne: l'ostéotomie cervico-capitale d'accourcissement métacarpien dans la main rhumatismale.

Volar dislocation of the four long fingers is a common situation in rheumatoid hands. Surgical reduction is rather difficult because of soft tissue retraction, especially interosseous muscles, and requires large releases. The authors propose the use of Weil's osteotomy, initially described in foot surgery. This is an oblique cervico-capital osteotomy which shortens the metacarpal bone, fixed by two screws. This makes soft tissue release less extensive and facilitates relocation of the extensor tendon. Two cases are reported.