Controlling posture using a plantar pressure-based,tongue-placed tactile biofeedback system

The present paper introduces an original biofeedback system for improving human balance control, whose underlying principle consists in providing additional sensory information related to foot sole pressure distribution to the user through a tongue-placed tactile output device. To assess the effect of this biofeedback system on postural control during quiet standing, ten young healthy adults were asked to stand as immobile as possible with their eyes closed in two conditions of No-biofeedback and Biofeedback. Centre of foot pressure (CoP) displacements were recorded using a force platform. Results showed reduced CoP displacements in the Biofeedback relative to the No-biofeedback condition. The present findings evidenced the ability of the central nervous system to efficiently integrate an artificial plantar-based, tongue-placed tactile biofeedback for controlling control posture during quiet standing.     

How a plantar pressure-based,tongue-placed tactile biofeedback modifies postural control mechanisms during quiet standing

The purpose of the present study was to determine the effects of a plantar pressure-based, tongue-placed tactile biofeedback on postural control mechanisms during quiet standing. To this aim, 16 young healthy adults were asked to stand as immobile as possible with their eyes closed in two conditions of No-biofeedback and Biofeedback. Centre of foot pressure (CoP) displacements, recorded using a force platform, were used to compute the horizontal displacements of the vertical projection of the centre of gravity (CoG _v ) and those of the difference between the CoP and the vertical projection of the CoG (CoP-CoG _v ). Analysis of the CoP-CoG _v displacements showed larger root mean square (RMS) and mean power frequencies (MPF) in the Biofeedback than in the No-biofeedback condition. Stabilogram-diffusion analysis further showed a concomitant increased spatial and reduced temporal transition point co-ordinates at which the corrective processes were initiated and an increased persistent behaviour of the CoP-CoG _v displacements over the short-term region. Analysis of the CoG _v displacements showed decreased RMS and increased MPF in the Biofeedback relative to the No-biofeedback condition. Stabilogram-diffusion analysis further indicated that these effects mainly stem from reduced spatio-temporal transition point co-ordinates at which the corrective process involving CoG _v displacements is initiated and an increased anti-persistent behaviour of the CoG _v displacements over the long-term region. Altogether, the present findings suggest that the main way the plantar pressure-based, tongue-placed tactile biofeedback improves postural control during quiet standing is via both a reduction of the correction thresholds and an increased efficiency of the corrective mechanism involving the CoG _v displacements.     

Percutaneous plantar fasciotomy: An anatomical study about its safety and efficacy

BackgroundPercutaneous plantar fasciotomy is one of the available options for recalcitrant cases of plantar fasciopathy, but there is a mismatch in the clinical results between different author’s experience, possibly due to variability when choosing the exact cutaneous entry point. The purpose of this study is to validate the plantar approach in the surgical treatment of plantar fasciopathy, describing a safe path and cutaneous entry point to perform a percutaneous plantar fasciotomy with a 2 mm incision testing the procedure on cadavers.Methodsa unicentric cross-sectional analytical study was conducted in 12 cadaveric feet to verify the accuracy of the percutaneous fasciotomy entry point. Independent variables analysed were: extent of fasciotomy, entry point location, spur resection, and soft tissues injuries. A double evaluation was performed: an indirect evaluation under fluoroscopic vision, and a direct evaluation after anatomical dissection.ResultsNo cases of plantar cortical lesion on the calcaneus was observed. Satisfactory fasciotomy was performed in 91.7% of the cases. An optimal entry point was noticed in all cases with a mean distance to the tip of tibial malleolus of 22.5 mm (±6.9; 35.1?12.1) and a mean distance to foot midline of 7.8 mm (±1.7; 11.8?5.1). No neurological nor vascular lesions were found. In all the feet, a laceration of the plantar part of flexor digitorum brevis muscle was noted.Conclusionthe plantar approach for percutaneous total plantar fasciotomy is a safe procedure. The current study provides an intraoperative guideline for minimising the possible risks.     

Gait analysis of foot compensation in symptomatic Hallux Rigidus patients

BackgroundCompensatory motion of foot joints in hallux rigidus (HR) are not fully known. This study aimed to clarify the kinematic compensation within the foot and to detect whether this affects plantar pressure distribution.MethodsGait characteristics were assessed in 16 patients (16 feet) with HR and compared with 15 healthy controls (30 feet) with three-dimensional gait analysis by using the multi-segment Oxford Foot Model, measuring spatio-temporal parameters, joint kinematics and plantar pressure.ResultsHR subjects showed less hallux plantar flexion during midstance and less hallux dorsiflexion during push-off, while increased forefoot supination was detected during push-off. No significant differences in plantar pressure were detected. Step length was significantly smaller in HR subjects, while gait velocity was comparable between groups.ConclusionsHR significantly affects sagittal hallux motion, and the forefoot compensates by an increased supination during push-off. Despite this kinematic compensatory mechanism, no significant differences in plantar loading were detected.     

Gait changes in persons with diabetes: Early risk marker for diabetic foot ulcer

Background Increasing prevalence of diabetic foot ulcer (DFU) and subsequent foot amputation in persons with type 2 diabetic neuropathy is a well known fact. The present study was aimed to identify the initial risk marker for DFU.Methods Dynamic plantar pressure analysis was done for persons with type 2 diabetes mellitus (T2DM) without neuropathy (D), patients with diabetic neuropathy (DN) with normal foot profile and healthy persons with normal foot profile (C).Results The data showed a significant difference in dynamic peak plantar pressure between C and DN (P = 0.035) and no significant difference between D and DN (P = 0.997). The dynamic segmental peak plantar pressure results showed significant difference only in the medial heel region (P = 0.009) among the three groups.Conclusions Gait variations and restrictions in subtalar and first metatarsophalangeal joint are found in persons with diabetic neuropathy even before the onset of foot deformity.     

Anatomical study of Lapidus arthrodesis using two different plantar plate systems

BackgroundFirst tarsometatarsal arthrodesis (modified Lapidus procedure) constitutes a sufficient treatment for moderate to severe hallux valgus deformity and first ray instability. The plantar plate arthrodesis was shown to provide superior mechanical stability and less postoperative complications than screw fixation or dorsal plating. Nevertheless, the in-brought hardware may cause irritation of the tibialis anterior or peroneus longus tendon requiring explantation of the material in some cases.The purpose of this study was to investigate the potential of tendon irritation after plantar first tarsometatarsal joint arthrodesis in a cadaver study.MethodsPlantar plate arthrodesis was performed as in real surgery on twelve pairs of fresh frozen cadaveric feet. Two different plate systems were randomly allocated to each pair of feet. After plate fixation careful dissection of the feet followed to analyze potential tendon irritation and to determine a “safe zone” for plantar plate placement.ResultsA “safe zone” between the insertion sties of tibialis anterior and peroneus longus tendon was found and proven to be sufficiently exposed using a standard medio-plantar approach. Both plates were fixed in this zone without compromising central tendon parts. Peripheral tendon parts were irritated in 42% using Darco Plantar Lapidus Plating System® (Wright Medical, Memphis, TN) and in 8% using the Plantar Lapidus Plate® (Arthrex, Naples, FL). Bending of the anatomically preshaped plates is often necessary to ensure optimal fit on the bone surface.ConclusionsModified Lapidus procedure with plantar plating of the first tarsometatarsal joint can be performed safely without compromising central tendon parts via standard medio-plantar approach.Level of clinical evidence5, Cadaver Study.     

Does the minimally invasive complete plantar fasciotomy result in deformity of the Plantar arch? A prospective study

BackgroundComplete plantar fasciotomy has been associated with changes in foot loading, leading to medial longitudinal arch collapse. The purpose of this study is to analyse our clinical experience with percutaneous complete plantar fasciotomy and quantify the possible changes in foot loading measured by the calcaneal pitch angle.MethodsA prospective case series study with patients operated between 2005–2012 was conducted, where AOFAS, Maryland Foot Score (MFS), VAS and radiological calcaneal pitch (CP) were recorded. Postoperative data were collected, where the surgeon evaluated the presence of complications, and an independent investigator performed radiological and scale evaluations follow-up: AOFAS, MFS, VAS and Benton-Weil questionnaire.ResultsA total of 60 patients, 62 feet, with a mean follow-up of 57 months (range 13–107) were studied. The MFS increased a mean of 21 points (p = .001), the AOFAS score a mean of 25 points (p = .001), and the VAS decreased a mean of 8.89 points (p = .001). A total of fifty-seven feet (91.9%) were pain-free at the end of follow-up. The mean CP dropped from 20.2° (range 11–34) preoperatively to 19.3° (range 11–34) at the end of follow-up (p = .05). In 25 feet (40.3%) there were no changes in the calcaneus pitch angle, in 21 feet dropped 1° (33.9%), in 11 dropped 2° (17.8%), 3 feet 3° (4.8%) and 2 feet (3.2%) 4°. Postoperative complications were noted in 4 feet (6.4%), with lateral column pain. The surgery meets the expectations of all patients.ConclusionsPercutaneous total fascia release is safe and does not produce a significant drop in arch height based on the radiological finding. Lack of success after surgery may be explained by other pathologies that might appear like plantar fasciitis. Further studies with gait analysis after total plantar fascia release in patients are needed.     

Impact of necrotising fasciitis on quality of life: A qualitative analysis

Mortality rates from severe necrotising soft tissue infections are improving progressively, therefore more emphasis should be placed on assessing and improving the quality of life of surviving patients. We investigated the functional and psychological issues, ability to social integration and self-perception of appearance in such patients presenting to our unit over 4 years. To conduct the study, we used the Short Form-36 and the Derriford Appearance Scale-24, which were distributed to those willing to participate. Ten patients have returned fully completed questionnaires. The overall quality of life and level of distress about the changed appearance were moderate (average SF-36 score of 65.8, DAS-24 score of 38). Statistical correlations between the scores and demographics were carried out using the Spearman rank correlation test. The capability of psychosocial adjustment was shown to improve with longer follow-up time and older age. However pain, physical limitations and energy levels were considerably more relevant in the older individuals and improved slower with time compared to psychological issues. Our results act as a good indicator of the quality of life in people dealing with the aftermath of necrotising soft tissue infections, but further, more extensive studies are required to achieve comprehensive and statistically significant results.