A comparison of hallux valgus angles assessed with computerised plantar pressure measurements, clinical examination and radiography in patients with diabetes.

BACKGROUND: Hallux valgus deformity is a common musculoskeletal foot disorder with a prevalence of 3.5% in adolescents to 35.7% in adults aged over 65 years. Radiographic measurements of hallux valgus angles (HVA) are considered to be the most reproducible and accurate assessment of HVA. However, in European countries, many podiatrists do not have direct access to radiographic facilities. Therefore, alternative measurements are desired. Such measurements are computerised plantar pressure measurement and clinical goniometry. The purpose of this study was to establish the agreement of these techniques and radiographic assessments. METHODS: HVA was determined in one hundred and eighty six participants suffering from diabetes. Radiographic measurements of HVA were performed with standardised static weight bearing dorsoplantar foot radiographs. The clinical goniometry for HVA was measured with a universal goniometer. Computerised plantar pressure measurement for HVA was executed with the EMED SF-4® pressure platform and Novel-Ortho-Geometry software. The intra-class correlation coefficients (ICC) and levels of agreement were analysed using Bland & Altman plots. RESULTS: Comparison of radiographic measurements to clinical goniometry for HVA showed an intraclass correlation coefficient (ICC) of 0.81 (95% confidence interval, 0.76 to 0.86; p<0.001). Radiographic measurement versus computerised plantar pressure measurement showed an ICC of 0.59 (95% confidence interval, 0.49 to 0.68; p<0.001). In addition, clinical goniometry versus computerised plantar pressure measurement showed an ICC of 0.77 (95% confidence interval, 0.70 to 0.82; p<0.001). The systematic difference of the computerised plantar pressure measurement compared with radiographic measurement and clinical goniometry was 7.0 degrees (SD 6.8) and 5.2 degrees (SD 5.0), respectively. The systemic difference of radiographic measurements compared with clinical goniometry was 1.8 degrees (SD 5.0). CONCLUSIONS: The agreement of computerised plantar pressure measurement and clinical goniometry for HVA compared to radiographic measurement of HVA is unsatisfactory. Radiographic measurements of HVA and clinical goniometry for HVA yield better agreement compared to radiographic measurements and computerised plantar pressure measurement. The traditional radiographic measurement techniques are strongly recommended for the assessment of HVA.

Patient and professional delay in the referral trajectory of patients with diabetic foot ulcers.

AIMS: A cohort study investigated referral and treatment trajectories of patients with diabetic foot ulceration consulting podiatrists. The study aims were to quantify patient, professional and treatment (=total) delay and to identify relationships between patient- or professional-related characteristics, delays or ulcer healing time. METHODS: Ten podiatrists specialising in diabetes care included 54 consecutive adults with diabetic foot ulceration. Assessments were performed retrospectively (e.g. delays) and prospectively (12 weeks). RESULTS: Median (SD; range) patient delay was 3.0 days (50.6; 0-243), professional delay 7.0 days (63.4; 0-279) and treatment delay 20.5 days (97.3; 0-522). 57% of patients took >2 weeks before visiting a podiatrist. Ulcers healed in 67% of patients in 49.0 days (90.2; 4-408). The number of health care professionals in the referral trajectory was positively related to treatment delay (p<0.01) and to ulcer healing time (p<0.01). Professional delay and treatment delay was positively correlated with the duration of the podiatric treatment (p<0.05). Patient awareness of ulceration risk tended to decrease the healing time. CONCLUSIONS: Patients with diabetic foot ulcers presented small median delays in the referral trajectory to podiatrists specialising in diabetes. The study results suggest that reducing the number of health care professionals in the referral trajectory might decrease treatment delay and ulcer healing time. Also improving patient awareness of ulceration risk might be beneficial for the healing time.

Prediction of peak pressure from clinical and radiological measurements in patients with diabetes.

BACKGROUND: Various structural and functional factors of foot function have been associated with high local plantar pressures. The therapist focuses on these features which are thought to be responsible for plantar ulceration in patients with diabetes. Risk assessment of the diabetic foot would be made easier if locally elevated plantar pressure could be indicated with a minimum set of clinical measures. METHODS: Ninety three patients were evaluated through vascular, orthopaedic, neurological and radiological assessment. A pressure platform was used to quantify the barefoot peak pressure for six forefoot regions: big toe (BT) and metatarsals one (MT-1) to five (MT-5). Stepwise regression modelling was performed to determine which set of the clinical and radiological measures explained most variability in local barefoot plantar peak pressure in each of the six forefoot regions. Comprehensive models were computed with independent variables from the clinical and radiological measurements. The difference between the actual plantar pressure and the predicted value was examined through Bland-Altman analysis. RESULTS: Forefoot pressures were significant higher in patients with neuropathy, compared to patients without neuropathy for the whole forefoot, the MT-1 region and the MT-5 region (respectively 138 kPa, 173 kPa and 88 kPa higher: mean difference). The clinical models explained up to 39 percent of the variance in local peak pressures. Callus formation and toe deformity were identified as relevant clinical predictors for all forefoot regions. Regression models with radiological variables explained about 26 percent of the variance in local peak pressures. For most regions the combination of clinical and radiological variables resulted in a higher explained variance. The Bland and Altman analysis showed a major discrepancy between the predicted and the actual peak pressure values. CONCLUSION: At best, clinical and radiological measurements could only explain about 34 percent of the variance in local barefoot peak pressure in this population of diabetic patients. The prediction models constructed with linear regression are not useful in clinical practice because of considerable underestimation of high plantar pressure values. Identification of elevated plantar pressure without equipment for quantification of plantar pressure is inadequate. The use of quantitative plantar pressure measurement for diabetic foot screening is therefore advocated.

Daily-life activities and in-shoe forefoot plantar pressure in patients with diabetes.

OBJECTIVE: To assess differences regarding in-shoe forefoot plantar pressure (PP) in patients with diabetes during various daily-life activities. RESEARCH DESIGN AND METHODS: In-shoe PP was measured in 93 patients during: level walking, ramp and stair walking, turning in different settings and while performing the Up & Go test. Separate PPs were determined for the big toe and metatarsal (mt) regions one to five. RESULTS: Across all activities, similar PPs were measured in the big toe and mt-1 to mt-3 region. Lower PPs were measured in mt-4 and mt-5 region. PPs during level walking were mostly higher when compared to the other activities (p

Testing the proficiency to distinguish locations with elevated plantar pressure within and between professional groups of foot therapists.

BACKGROUND: Identification of locations with elevated plantar pressures is important in daily foot care for patients with rheumatoid arthritis, metatarsalgia and diabetes. The purpose of the present study was to evaluate the proficiency of podiatrists, pedorthists and orthotists, to distinguish locations with elevated plantar pressure in patients with metatarsalgia. METHODS: Ten podiatrists, ten pedorthists and ten orthotists working in The Netherlands were asked to identify locations with excessively high plantar pressure in three patients with forefoot complaints. Therapists were instructed to examine the patients according to the methods used in their everyday clinical practice. Regions could be marked through hatching an illustration of a plantar aspect. A pressure sensitive platform was used to quantify the dynamic bare foot plantar pressures and was considered as 'Gold Standard' (GS). A pressure higher than 700 kPa was used as cut-off criterion for categorizing peak pressure into elevated or non-elevated pressure. This was done for both patient's feet and six separate forefoot regions: big toe and metatarsal one to five. Data were analysed by a mixed-model ANOVA and Generalizability Theory. RESULTS: The proportions elevated/non-elevated pressure regions, based on clinical ratings of the therapists, show important discrepancies with the criterion values obtained through quantitative plantar pressure measurement. In general, plantar pressures in the big toe region were underrated and those in the metatarsal regions were overrated. The estimated method agreement on clinical judgement of plantar pressures with the GS was below an acceptable level: i.e. all intraclass correlation coefficient's equal or smaller than .60. The inter-observer agreement for each discipline demonstrated worrisome results: all below .18. The estimated mutual agreements showed that there was virtually no mutual agreement between the professional groups studied. CONCLUSION: Identification of elevated plantar pressure through clinical evaluation is difficult, insufficient and may be potentially harmful. The process of clinical plantar pressure screening has to be re-evaluated. The results of this study point towards the merit of quantitative plantar pressure measurement for clinical practice.

Casting methods and plantar pressure: effects of custom-made foot orthoses on dynamic plantar pressure distribution.

Foot orthoses are widely used to treat various foot problems. A literature search revealed no publications on differences in plantar pressure distribution resulting from casting methods for foot orthoses. Four casting methods were used for construction of orthoses. Two foam box techniques were used: accommodative full weightbearing method (A) and functional semiweightbearing method (B). Also, two suspension plaster casting techniques were used: accommodative casting (C) and functional subtalar joint neutral position (Root) method (D). Their effects on contact area, plantar pressure, and walking convenience were evaluated. All orthoses increased the total contact area (mean, 17.4%) compared with shoes without orthoses. Differences in contact areas between orthoses for total plantar surface were statistically significant. Peak pressures for the total plantar surface were lower with orthoses than without orthoses (mean, 22.8%). Among orthoses, only the difference between orthoses A and B was statistically significant. Differences between orthoses for the forefoot were small and not statistically significant. The gait lines of the shoe without an insole and of the accommodative orthoses are more medially located than those of functional orthoses. Walking convenience in the shoe was better rated than that with orthoses. There were no differences in perception of walking convenience between orthoses A, B, and C. Orthosis D had the lowest convenience rating. The four casting methods resulted in differences between orthoses with respect to contact areas and walking convenience but only slight differences in peak pressures.

Comparison of foot orthoses made by podiatrists, pedorthists and orthotists regarding plantar pressure reduction in The Netherlands.

BACKGROUND: There is a need for evidence of clinical effectiveness of foot orthosis therapy. This study evaluated the effect of foot orthoses made by ten podiatrists, ten pedorthists and eleven orthotists on plantar pressure and walking convenience for three patients with metatarsalgia. Aims were to assess differences and variability between and within the disciplines. The relationship between the importance of pressure reduction and the effect on peak pressure was also evaluated. METHODS: Each therapist examined all three patients and was asked to rate the 'importance of pressure reduction' through a visual analogue scale. The orthoses were evaluated twice in two sessions while the patient walked on a treadmill. Plantar pressures were recorded with an in-sole measuring system. Patients scored walking convenience per orthosis. The effects of the orthoses on peak pressure reduction were calculated for the whole plantar surface of the forefoot and six regions: big toe and metatarsal one to five. RESULTS: Within each discipline there was an extensive variation in construction of the orthoses and achieved peak pressure reductions. Pedorthists and orthotists achieved greater maximal peak pressure reductions calculated over the whole forefoot than podiatrists: 960, 1020 and 750 kPa, respectively (p < .001). This was also true for the effect in the regions with the highest baseline peak pressures and walking convenience rated by patients A and B. There was a weak relationship between the 'importance of pressure reduction' and the achieved pressure reduction for orthotists, but no relationship for podiatrists and pedorthotists. CONCLUSION: The large variation for various aspects of foot orthoses therapy raises questions about a consistent use of concepts for pressures management within the professional groups.

Three-dimensional reconstruction of magnetic resonance images of a displaced flexor hallucis longus tendon in hallux valgus.

By using three-dimensional magnetic resonance image reconstruction, lateral displacement of the flexor hallucis longus tendon and sesamoid bones was made clearly visible in a living patient. This finding supports a biomechanical model related to disturbed muscle balance at the first metatarsophalangeal joint, which could play an important role in the pathogenesis of hallux valgus and metatarsus primus varus.

Total contact casting of the diabetic foot in daily practice: a prospective follow-up study.

OBJECTIVE: A limited number of clinical trials have shown that the total contact cast (TCC) is an effective treatment in neuropathic, noninfected, and nonischemic foot ulcers. In this prospective data collection study, we assessed outcome and complications of TCC treatment in neuropathic patients with and without peripheral arterial disease (PAD) or (superficial) infection. RESEARCH DESIGN AND METHODS: Ninety-eight consecutive patients selected for casting were followed until healing; all had polyneuropathy, 44% had PAD, and 29% had infection. Primary outcomes were percentage healed with a cast, time to heal, and number of complications. RESULTS: Ninety percent of all nonischemic ulcers without infection and 87% with infection healed in the cast (NS). In patients with PAD but without critical limb ischemia, 69% of the ulcers without infection and 36% with infection healed (P < 0.01). In multivariate analyses, PAD, infection, and heel ulcers were associated with a lower percentage healed (all P < 0.05). Median duration of cast treatment was 34 days. New ulcers, all superficial, developed in 9% and preulcerative lesions in 28% of the patients; these skin lesions healed in the cast within a maximum of 13 days. CONCLUSIONS: In comparison to pure neuropathic ulcers, ulcers with moderate ischemia or infection can be treated effectively with casting. However, when both PAD and infection are present or the patient has a heel ulcer, outcome is poor and alternative strategies should be sought. The high rate of preulcerative lesions stresses the importance of close monitoring during TCC treatment.