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[Association of flatfoot with pain, fatigue and obesity in Japanese over sixties].

PURPOSE: There is still uncertainty whether flatfoot, characterized by lower height of the medial longitudinal arch of the foot, is associated with foot symptoms in adults. Furthermore, few studies have been conducted to examine any association with obesity in older people. In this study, we therefore assessed the prevalence of flatfoot among community-dwelling older men and women using a footprint method, and analyzed relationships with foot symptoms and obesity. METHODS: The study sample consisted of 242 women and 98 men aged 60 years or older who were neither institutionalized nor disabled in activities of daily living. We collected footprints of both feet, data on weight and height, and information on foot symptoms and daily activity. From the footprints, we identified the H line by connecting the tip of the second toe and the intersection of the internal surface tangent of the foot and the external one. Then flatfoot was defined as concavity of the medial arch situated medial to the H line in either foot. Foot symptoms (pain and fatigue) were assessed using a 3-scale questionnaire: no pain (fatigue); present only when walking or standing; or present anytime. If present, the place of the pain or the fatigue was further identified. We analyzed associations with these symptoms and also with obesity assessed in terms of the body mass index (BMI). RESULTS: We identified flatfoot in 26.5% (95% Confidence Interval: 22.0-31.0) of the men and 25.7% (95% Confidence Interval: 20.2-31.2) of the women. In both sexes, the affected individuals had a higher prevalence of foot pain and fatigue than those unaffected. The association with the latter in women was particularly significant. There was a linear association between prevalence of flatfoot with the BMI category in women. In addition, the prevalence was lowest in the least obese category in men although this did not reach statistical significance. CONCLUSIONS: Flatfoot was significantly associated with the presence of pain and fatigue in women. Furthermore, a significant positive association with obesity was noted.

Aged↗

The relationship between the flexible flatfoot and plantar fasciitis: ultrasonographic evaluation.

BACKGROUND: The purpose of this study was to investigate the relationship between flexible flatfoot and plantar fasciitis. METHODS: Twenty-three subjects with flexible flatfoot and 23 subjects with normal arched feet were enrolled. Footprint analysis was used to evaluate the foot conditions in both groups to calculate the individual arch index. We compared the sonographic images of plantar fascia in the flexible flatfoot group with the normal arch group using high-frequency ultrasound. RESULTS: The analysis results indicated that the thickening of the plantar fascia in the flexible flatfoot group was significantly different from the normal arch group. In the flexible flatfoot group, 10 of 23 patients (43.4%) had plantar fasciitis, but only two subjects (8.7%) in the normal arch group had plantar fasciitis. CONCLUSIONS: There was a higher incidence of plantar fasciitis in the flexible flatfoot group than the normal arch control group in this study.

Adolescent↗

The C sign: more specific for flatfoot deformity than subtalar coalition.

OBJECTIVE: To assess the sensitivity and specificity of the C sign, a C-shaped line created by the outline of the talar dome and the inferior margin of the sustentaculum tali on lateral ankle radiographs, for patients with both flatfoot deformity and specifically talocalcaneal (TC) coalition. DESIGN AND PATIENTS: All patients in this retrospective study were under 35 years of age and had a lateral ankle radiograph and follow-up CT scan for a non-traumatic indication. Forty-eight cases over the past 5 years fulfilled these criteria. Two masked musculoskeletal radiologists determined the presence or absence of the C sign for each lateral radiograph by consensus. Each CT study was then assessed by a third musculoskeletal radiologist for the presence of tarsal coalition. Observations were correlated with clinical history regarding presence or absence of flatfoot deformity. RESULTS: Ten cases of TC coalition were diagnosed, four of which demonstrated a C sign (40%). Eight cases with a C sign were encountered, four of which had TC coalition (50%) and four did not. All patients with a positive C sign had a flatfoot clinically (100%), while only eight of 24 flatfooted patients had a C sign (33%). CONCLUSION: The C sign is specific, but not sensitive, for flatfoot deformity, and is neither sensitive nor specific for subtalar coalition.

Adolescent↗

Calcaneocuboid distraction arthrodesis for posterior tibial tendon dysfunction and flatfoot: a cadaveric study.

Nine fresh-frozen foot specimens were studied to determine the mechanical behavior of the foot using calcaneocuboid distraction arthrodesis, an operation designed for treatment of posterior tibial tendon dysfunction with flatfoot deformity. Flatfoot deformity was created in cadaveric specimens, and to simulate toe-off phase of gait, loads were applied to the plantar surface of the foot and six tendons. Three-dimensional tarsal bone positions were determined with a magnetic tracking system. With ligament sectioning, flatfoot deformity was observed and average arch height decreased 53 +/- 3.5 mm. Height arch increased after calcaneocuboid distraction arthrodesis an average of 3.2 +/- 3.6 mm and was less than normal arch at an average of 2.1 +/- 2.4 mm. Metatarsotalar alignment compared with flatfoot improved after calcaneocuboid distraction arthrodesis in adduction and inversion to the extent that these were not significantly different from intact foot positions. Calcaneotalar position improved after calcaneocuboid distraction arthrodesis in adduction and inversion. Calcaneocuboid alignment compared with flatfoot improved after calcaneocuboid distraction arthrodesis in adduction, plantar flexion, and eversion, but compared with an intact foot was overcorrected in all three planes of motion. Arch alignment in simulated toe-off phase of gait in cadaveric feet was improved significantly with calcaneocuboid distraction arthrodesis but was not reduced anatomically.

Aged↗

Alterations in talar morphology associated with adult flatfoot.

To gain a better understanding on the anatomy of the factors contributing to symptomatic flatfoot, we compared the shape of the talus in feet that were flat to that in control tali from feet with a normal arch. Computed tomographic (CT) scans were performed on 9 adult patients with 10 symptomatic flatfoot deformities. CT scans of 10 feet being evaluated for acute trauma not involving the talus were randomly selected as controls. Flatfoot tali tended to be of greater overall length than the control tali, and this difference was not statistically significant. Statistically significant differences were found when comparing ratios of talar length with talar width (P = 0.011), talar length with talar height (P = 0.001) (they were long relative to their height and width), and head length with head width (P = 0.001) for individual tali from the two groups. The tali from the flatfoot group were narrower in width and shorter in height when compared with overall length and had heads that were more elongated in the transverse plane than tali in feet with a normal appearance. CLINICAL CORRELATION: When performing surgical correction of a flatfoot in an adult, appearance of the foot rather than standard radiographic parameters should be used to judge the reduction. The altered shape of the bone may alter the standard radiographic parameters.

Adult↗

Effect of calcaneal osteotomy and plantar fasciotomy on arch configuration in a flatfoot model.

Seven fresh-frozen cadaver specimens had a calcaneal osteotomy performed obliquely through the posterior portion of the calcaneus. Angular relationships between the first metatarsal and talus were recorded with the use of a motion-analysis system in the transverse, sagittal, and coronal planes. The specimen was mounted in a testing machine and loaded via an intramedullary rod to 150, 350, and 550 N. A flatfoot model was created, and repeat measurements were obtained. The calcaneal osteotomy was then displaced 1 cm medially, and repeat measurements were made at each of the three load levels. The calcaneal osteotomy was then returned to its original position, the plantar fascia was divided, and the new angular measurements were obtained. The calcaneal osteotomy was again displaced 1 cm, and repeat angular measurements were obtained. A mild consistent flatfoot deformity was created in all three axes before the plantar fascia was cut. A statistically significant increase in deformity was noted after cutting the plantar fascia. A correction of the flatfoot deformity in all three planes occurred with the medial displacement of the calcaneal osteotomy, which was greater at the lower load levels. We noted that a medial displacement calcaneal osteotomy partially corrected a flatfoot deformity in all three planes. The correction occurred with or without an intact plantar fascia and, therefore, is independent of the structure. We also noted an increased deformity after dividing the plantar fascia. This study provides some biomechanical insight as to the corrective effect of a medial displacement calcaneal osteotomy in correcting a flatfoot deformity.

Cadaver↗

Three-dimensional analysis of flatfoot deformity: cadaver study.

Eleven fresh-frozen cadaver foot specimens were tested to define changes in tarsal alignment associated with flatfoot, or pes planus, a common clinical problem. The three-dimensional position of four bones (talus, calcaneus, navicular, and first metatarsal) relative to the fixed tibia was determined with a magnetic tracking system in the intact foot and flatfoot conditions. In the flatfoot, the average metatarsal-to-talar position difference was 11.7 degrees +/-4.4 degrees in abduction (P < 0.0001), 10.4 degrees +/-3.6 degrees in dorsiflexion (P < 0.0001), and 10.9 degrees +/-6.0 degrees in eversion (P < 0.0001) compared with the intact foot. The average calcaneal-to-talar position difference was 2.2 degrees +/-2.6 degrees in abduction (P=0.0171) and 2.7 degrees+/-2.0 degrees in eversion (P=0.0012) compared with the intact foot. The average navicular-to-talar position difference was 13.6 degrees +/-5.0 degrees in abduction (P < 0.0001), 10.5 degrees +/-6.6 degrees in dorsiflexion (P=0.0004), and 8.1 degrees +/-3.8 degrees in eversion (P < 0.0001) compared with normal. The average talar-to-tibial position difference was -8.2 degrees +/-3.2 degrees in dorsiflexion (P < 0.001) compared with the intact foot. The average arch height difference was 6.0+/-2.7 mm (P < 0.0001) less than the normal condition. The deformity associated with flatfoot is complex and occurs in multiple joints and in all three planes. An understanding of the normal and pathologic (flatfoot) conditions is necessary to surgically restore appropriate alignment and function in hindfoot reconstruction operations.

Adult↗

Pediatric flatfoot: evaluation and management.

Although the exact incidence of flatfoot in children is unknown, it is a common finding. All children have only a minimal arch at birth, and more than 30% of neonates have a calcaneovalgus deformity of both feet. This condition is not painful and generally resolves without treatment; very rarely is corrective casting necessary. Most children who present to an orthopaedist for evaluation of flatfoot will have a flexible flatfoot that does not require treatment. Nevertheless, the examining physician must rule out other conditions that do require treatment, such as congenital vertical talus, tarsal coalition, and skew-foot. Untreated, congenital vertical talus may result in an awkward gait; manipulation and casting have been tried, but most authors now agree that surgical treatment is required. Although tarsal coalitions can become asymptomatic in adulthood, the anatomy will never be normal. Resection and inter-position of the extensor digitorum brevis is the treatment of choice for calcaneonavicular coalitions; the results of treatment of talocalcaneal coalitions are less predictable. Skewfoot should be treated by manipulation and serial casting as soon as it is detected. In the older child, hindfoot stabilization and realignment of the midfoot may be necessary. Surgical management is rarely indicated for a true flexible flatfoot. A variety of tendon transfers and reconstructive procedures have been advocated, but none has proved uniformly successful. Nor has any of the various types of supports ever been shown to change the arch architecture. Although parents are often concerned about pediatric flatfoot, the child is usually found to be asymptomatic, and no treatment is indicated. In most instances, the best treatment is simply taking enough time to convince the family that no treatment is necessary.

Adolescent↗

[The acquired buckling-flatfoot. A foot deformity due to obesity?].

Flatfoot deformity is characterized by a multiplanar hindfoot malalignment. Although the etiology remains unclear, the deformity is mainly attributed to ligamentous laxity and dysfunction of the posterior tibial tendon. Obesity is thought to be a risk factor that additionally impairs hindfoot stability. Performing a retrospective clinical and radiological study, we compared two groups, each with 75 patients. One group included patients with a flatfoot deformity stage 2, while the other group showed no hindfoot malalignment. Reviewing the weight and calculating the body mass index revealed significantly increased values for those patients with flatfoot deformity (P=0.034 and P>0.001, respectively). This correlation should be considered during the decision-making process on surgical strategies. In obese patients with flatfoot deformity, stage 2 soft tissue reconstruction and hindfoot osteotomies should be combined with hindfoot arthrodeses, i.e. subtalar fusion, to maintain sufficient and durable stability.

Adult↗

Flexible flatfoot and related factors in primary school children: a report of a screening study.

The aim of this study was to analyze the longitudinal arch morphology and related factors in primary school children. Five hundred and seventy-nine primary school children were enrolled in the study. Generalized joint laxity, foot progression angle, frontal hindfoot alignment, and longitudinal arch height in dynamic position were evaluated. The footprints were recorded by Harris and Beath footprint mat and arch index of Staheli was calculated. The mean age was 9.23 +/- 1.66 years. Four hundred and fifty-six children (82.8%) were evaluated as normal and mild flexible flatfoot, and 95 children (17.2%) were evaluated as moderate and severe flexible flatfoot. The mean arch indices of the feet was 0.74 +/- 0.25. The percentage of flexible flatfoot in hypermobile and non-hypermobile children was found 27.6 and 13.4%, respectively. There was a statistically significant difference in dynamic arch evaluation between hypermobile and non-hypermobile children. There was a significant negative correlation between arch index and age, and a significant negative correlation between hypermobility score and age. Our study confirms that the flexible flatfoot and the hypermobility are developmental profiles.

Age Factors↗

Operative treatment of flatfoot with talocalcaneal coalition.

Rigid flatfoot or peroneal spastic flatfoot often is associated with a congenital fibrous, cartilaginous, or osseous union of two tarsal bones or more, potentially causing great difficulties in its treatment. Since 1996, 12 patients (14 feet) with painful flatfoot and restricted motion of the hindfoot attributable to talocalcaneal coalition, were treated by resection of the coalition and subtalar arthroereisis by a bioreabsorbable implant. The results were evaluated by the ankle hindfoot clinical rating system of the American Orthopaedic Foot and Ankle Society. These clinical results also were evaluated statistically. Radiographs and computed tomography scans were taken preoperatively and postoperatively. Eight (57.1% of patients) had excellent results, three (21.4% of patients) had good results, and three (21.4% of patients) had fair results. No poor results, or subjective or objective complications were reported. On the basis of these early results, arthroereisis by implanting a bioreabsorbable device after removal of the tarsal coalition, seems to be an effective procedure for the treatment of symptomatic flatfoot associated with talocalcaneal coalitions: correcting the relationship between talus and calcaneus, restoring the alignment of the hindfoot, and reducing pain.

Absorbable Implants↗

Effects of lower extremity rotation on prognosis of flexible flatfoot in children.

The aim of this study is to search the effects of tibial torsion on flexible flatfoot. For this purpose, 20 children with flexible flatfoot and external tibial torsion were determined as a study group. The control group which consisted of 10 children with flexible flatfoot without rotational problems was included in the study. Plantar flexion angle of talus, talo-1. metatarsal angle and dorsoplantar talocalcaneal angle were measured on standing foot radiographs. Tibial torsion was measured by computed tomography. Plantar flexion angle of talus and dorsoplantar talocalcaneal angle were found significantly lower in the study group (p<0.005 and p<0.005 respectively), although talo-1. metatarsal angle was not significantly different between the groups (p=.2917). Naviculocuneiform sag was prominent in all cases of study group. In conclusion, abnormal external tibial torsion may affect the foot deformity and this can change the benign nature of the flexible flatfoot.

Case-Control Studies↗

The effects of adult acquired flatfoot deformity on tibiotalar joint contact characteristics.

Changes in the tibiotalar contact characteristics were investigated using eight fresh frozen cadaver ankle specimens to further develop an established model of the acquired flatfoot deformity. The deformity was simulated by sectioning the tendons and ligaments of the ankle and foot that normally support the longitudinal arch. Axial loads of 1,350 N were applied to the foot in a neutral position in both the intact specimen and flatfoot model. The flatfoot condition resulted in significant lateral shifts of 5.28 mm in global contact area and 11.26 mm in the location of peak pressure, and in a small but significant posterior shift of 1.14 mm in global contact area. The flatfoot condition also resulted in a significant, 35%, reduction in contact area. Significant increases in mean pressure, 14%, and peak pressure, 13%, were also found, but were not in proportion to the relatively large decrease in contact area. This suggests a transfer of load off of the talar dome. Increased loading of the lateral facet and fibula are suspected. The lateral shift in the contact region created a local increase in mean contact pressure that may be responsible for long term degenerative changes in patients with this deformity.

Adult↗

Plantarflexion opening wedge medial cuneiform osteotomy for correction of fixed forefoot varus associated with flatfoot deformity.

BACKGROUND: Flatfoot presents as a wide spectrum of foot deformities that include varying degrees of hindfoot valgus, forefoot abduction, and forefoot varus. Medial displacement calcaneal osteotomy, lateral column lengthening, and subtalar fusion can correct heel valgus, but may not adequately correct the fixed forefoot varus component. The purpose of this study was to determine the effectiveness of plantarflexion opening wedge medial cuneiform (Cotton) osteotomy in the correction of forefoot varus. METHODS: Sixteen feet (15 patients) had plantarflexion opening wedge medial cuneiform osteotomies to correct forefoot varus associated with flatfoot deformities from several etiologies, including congenital flatfoot (six feet, average age 37 years), tarsal coalition (five feet, average age 15 years), overcorrected clubfoot deformity (two feet, ages 17 years and 18 years), skewfoot (one foot, age 15 years), chronic posterior tibial tendon insufficiency (one foot, 41 years), and rheumatoid arthritis (one foot, age 56 years). RESULTS: Standing radiographs showed an average improvement in the anterior-posterior talo-first metatarsal angle of 7 degrees (9 degrees preoperative, 2 degrees postoperative). The talonavicular coverage angle improved an average of 15 degrees (20 degrees preoperative, 5 degrees postoperative). The lateral talo-first metatarsal angle improved an average of 14 degrees (-13 degrees preoperative, 1 degree postoperative). Correcting for radiographic magnification, the distance from the mid-medial cuneiform to the floor on the lateral radiograph averaged 40 mm preoperatively and 47 mm postoperatively (average improvement 7 mm). All patients at followup described mild to no pain with ambulation. There were no nonunions or malunions. CONCLUSIONS: Opening wedge medial cuneiform osteotomy is an important adjunctive procedure to correct the forefoot varus component of a flatfoot deformity. Advantages of this technique in comparison to first tarsometatarsal arthrodesis include predictable union, preservation of first ray mobility, and the ability to easily vary the amount of correction. Because of the variety of hindfoot procedures done in these patients, the degree of hindfoot correction contributed by the cuneiform osteotomy alone could not be determined. We have had excellent results without major complications using this technique.

Adolescent↗

Fusion rate of first tarsometatarsal arthrodesis in the modified Lapidus procedure and flatfoot reconstruction.

BACKGROUND: The purpose of this study was to determine the overall first tarsometatarsal joint (TMTJ) union rate in patients after they had a modified Lapidus procedure or a TMTJ arthrodesis as part of a flatfoot reconstruction. METHODS: We retrospectively reviewed the charts of 182 patients (201 feet) who had a modified Lapidus procedure or a TMTJ arthrodesis as part of a flatfoot reconstruction between May, 1997, and May, 2001; all had at least a 6-month followup. The data collected included age, gender, tobacco use, diabetic status, complications, and radiographic evidence of union. There were 167 women and 15 men. The right foot was operated on in 106 patients and the left foot in 95. The average age was 53 (range 11 to 87) years. RESULTS: First TMTJ arthrodesis healed uneventfully in 193 (96%), and eight (4%) had nonunions. Of those eight patients with nonunions, five had previous bunion surgeries, two were smokers, and one had diabetes. There were 25 (12%) patients with previous bunion surgeries and five of these (20%) had nonunions. Four patients (2%) had symptomatic nonunions resulting in revision. Of the 21 patients undergoing flatfoot reconstruction, none had a nonunion. CONCLUSION: One criticism of the modified Lapidus procedure is the unacceptable nonunion rate (10 to 12%). Out of the 201 feet, we had a 4% nonunion rate and a 2% revision rate, which is well below the reported nonunion rates. We also have found that patients with previous bunion surgery and recurrent deformity were at a higher risk for a nonunion. CLINICAL RELEVANCE: We believe that the modified Lapidus procedure and first TMTJ arthrodesis can achieve acceptable union rates and be successful for correcting hallux valgus with a hypermobile first ray and can also be applied to certain patients undergoing flatfoot reconstruction.

Adult↗

Reconstruction operations for acquired flatfoot: biomechanical evaluation.

A major limitation of operations commonly performed for acquired flatfoot is inadequate correction of alignment. The authors defined the efficacy of two operations, deltoid ligament reconstruction and flexor digitorum longus tendon transfer, for treatment of posterior tibial tendon dysfunction with flatfoot deformity. Twelve fresh-frozen foot specimens were used. A flatfoot deformity was created, and, to simulate the midstance phase of gait, loads were applied axially to the plantar surface of the foot and to appropriate tendons. Foot position improved substantially after deltoid ligament reconstruction but not after flexor digitorum longus tendon transfer. The average increase in arch height after deltoid ligament reconstruction was 10.3 +/- 8.9 mm and after flexor digitorum longus tendon transfer, -0.6 +/- 2.0 mm. Mean arch height after deltoid ligament reconstruction was 2.2 +/- 1.7 mm less than intact arch height and, after flexor digitorum longus tendon transfer, 13.2 +/- 9.0 mm less than intact arch height. Improvement in metatarsal-talar, calcaneal-talar, and talar-tibial positions was significantly greater after deltoid ligament reconstruction than after flexor digitorum longus tendon transfer. Although the authors do not advocate clinical use, the deltoid ligament reconstruction was more effective than flexor digitorum longus tendon transfer in restoring arch alignment in flatfoot.

Adult↗

Talocalcaneal and subfibular impingement in symptomatic flatfoot in adults.

BACKGROUND: Patients with symptomatic flatfoot deformity often present with pain in the lateral part of the hindfoot. The cause of this pain has not been clearly established. Impingement between the talus and the calcaneus or between the calcaneus and the fibula has been suggested as a cause but has not been documented. METHODS: We examined the computed tomographic scans, performed with simulated weight-bearing, of nineteen adult patients with symptomatic flatfoot to determine the potential causes of pain in the lateral aspect of the foot. The scans were performed with use of a custom loading frame designed to simulate weight-bearing with the foot in a neutral position while a 75-N axial compressive load was applied. Four examiners independently examined the coronal images as well as sagittal plane reconstructions for direct (bone-on-bone contact) and indirect (subchondral sclerosis or cysts) evidence of (1) extra-articular contact between the talus and the calcaneus in the sinus tarsi and (2) contact between the calcaneus and the fibula. The data were compared with those from five scans of normal feet in neutral alignment. RESULTS: Overall, the prevalence of sinus tarsi impingement was 92% and the prevalence of calcaneofibular impingement was 66% in the flatfoot group versus 0% and 5%, respectively, in the control group. The study patients who had calcaneofibular impingement also had sinus tarsi impingement. There was substantial agreement among the examiners as to whether impingement was present. CONCLUSIONS: There appear to be two frequently occurring extra-articular sources of bone impingement in the lateral aspect of the hindfoot in adults with symptomatic severe flatfoot deformity. The impingement in the lateral aspect of the hindfoot may first occur within the sinus tarsi and then involve the calcaneofibular region. Cyst formation and/or sclerosis in this region that is visible on plain radiographs or on computed tomographic scans performed without weight-bearing should create suspicion of impingement.

Adult↗

Hypermobile flatfoot in children. Comprehension, evaluation, and treatment.

Comprehension of the hypermobile flatfoot deformity depends on an understanding of the three structural deformities of the foot associated with the condition: (1) abduction of the forefoot relative to the weight-bearing line; (2) supination of the forefoot; and (3) heel valgus. Evaluation of the hypermobile flatfoot deformity is by clinical examination to determine the position of the foot with the talonavicular joint in the congruous position: position and motion of these components are determined from this starting point. A standing lateral talometatarsal angle is used to evaluate the deformity roentgenographically. Treatment in the newborn or infant is by casting, inflare shoes, and Denis-Browne night splints for severe deformities. Support with shoes is used in children one to three years of age. Complete clinical and roentgenographic examinations should be performed when the child is three years of age. If a painful or grossly abnormal flatfoot deformity is present, custom-molded inserts are used during the period of growth. After growth has ceased flatfoot is treated only if it is painful or produces impairment. Treatment is then by shoes, inserts, or orthotics. Surgery is considered only if these devices do not alleviate the difficulty and the patient is incapacitated. Surgical procedures are designed to correct the structural abnormalities without fusing joints in an attempt to restore the normal position and motion of the components of the foot.

Adolescent↗