Fibular hemimelia: reconstruction of difficult cases with tibial lengthening and ankle arthrodesis.

PURPOSE: Management of fibular hemimelia includes either prosthetic care with or without a suitable amputation or tibial lengthening. Many studies have documented the success of both procedures. Most parents of these children refuse an amputation or have no access to good prosthetic care. The author presents a limb-salvage procedure with tibial lengthening and ankle stabilization. METHODS: Twelve children of fibular hemimelia with 14 extremities had been subjected to limb lengthening after lateral leg release. To correct the valgus procurvatum, double oblique diaphyseal osteotomy (DODO) of the tibia was performed in 11 extremities. The age of the patients ranged from two to 15 years with the median of five years. All were male. The proposed procedure included three stages of loosening, lengthening, and stabilization with ankle arthrodesis at a later stage. RESULTS: All patients returned for follow-up for the first four years and had been walking on their sensate feet. With DODO followed by fixator/traction could straighten and lengthen the tibia simultaneously and correct the valgus procurvatum. Ankle stabilization provided stability and a plantigrade foot. A follow-up of six to 30 years with a median of ten years has been reported. CONCLUSION: A new procedure of loosening, lengthening, and stabilization of the leg with ankle arthrodesis has been proposed. A follow-up of 30 years with a median of ten years of the said procedure has been reported. The procedure provides a long-lasting plantigrade and painless foot that has sensation and proprioception. An amputation at any level has not been recommended.

Outcomes of Total Ankle Replacement with Preoperative Varus Deformity.

Historically, coronal plane deformities of greater than 10° to 15° have been deemed contraindications for total ankle replacement (TAR). However, recent studies show satisfactory results in TAR with severe preoperative varus deformity. When correctly applying ancillary procedures, preoperative varus deformity can be structurally corrected, resulting in similar clinical scores to those obtained with "regular TAR." However, complications and revisions appear to increase with increasing deformity. Unfortunately, results of TAR in varus ankles consist of heterogeneous data (eg, with regards to prosthetic brands, bearing-types, duration of follow-up, and ancillary procedures) precluding strict conclusions. This could be solved by an international consensus group.

Rotura de la sindesmosis asociada a fracturas diafisarias de tibia de alta energía: serie de casos de una lesión habitualmente inadvertida / Syndesmosis injury associated with high-energy tibial shaft fractures: Case series of a misdiagnosis rupture

Introducción: Las fracturas diafisarias espiroideas de tibia pueden asociarse a lesiones sindesmales del tobillo. No tenemos conocimiento de que exista evidencia sobre la incidencia de lesiones sindesmales ipsilaterales asociadas a los mecanismos de fractura de tibia de alta energía con patrones oblicuos y transversos. Nuestro objetivo fue analizar retrospectivamente una serie de pacientes que presentaron rotura de la sindesmosis asociada a fracturas diafisarias de tibia con patrones oblicuos y transversos y evaluar la incidencia en nuestro medio. Métodos: Del total de 233 fracturas diafisarias de tibia operadas entre enero de 2007 y enero de 2017, se analizaron los patrones de fractura, se clasificaron según AO, se midió el ángulo talocrural, se analizaron los fracasos y reoperaciones y se describe un método poco conocido de fracaso. Resultados: De 234 fracturas que cumplieron los criterios de inclusión, 159 (64,96%) sufrieron fracturas cerradas y 75 (32,05%) expuestas. Según el sistema AO: 152 (64,10%) fueron patrones simples 42.A; 49 (20,94%) patrones tipo cuña 42.B, y 33 (14,10%) en patrones complejos 42.C. Diez pacientes presentaron acortamiento del peroné, evidenciado por el aumento del ángulo talocrural en las radiografías postoperatorias, suponiendo un 4,27% de la muestra. Nueve pacientes requirieron cirugía; el paciente restante se perdió en el seguimiento. Todos los pacientes presentaron restauración del ángulo talocrural normal. Conclusión: La incidencia de lesiones sindesmales inadvertidas asociadas a fracturas diafisarias de tibia oblicuas y transversas llega al 4,27% en nuestra serie. Consideramos necesaria la evaluación del tobillo y la sindesmosis en todas las fracturas diafisarias de tibia, aun con patrones de alta energía y no solo en patrones espiroideos, a fin de lograr mejores resultados y evitar secuelas e intervenciones futuras.(AU)

Introduction: Ankle syndesmosis injuries can be associated with a spiral mechanism on tibial shaft fractures. We are not aware if there is evidence of the incidence of ipsilateral syndesmotic lesson associated to high-energy tibial shaft fracture mechanisms. The aim of this study was to analyze the incidence of syndesmotic injuries associated with high-energy tibial shaft fractures. Methods: 233 diaphyseal tibial fractures operated between January 2007 and January 2017, the fracture patterns were analyzed, they were classified according to AO, the talocrural angle was measured, they analyzed failures and reoperations and described a novel failure method. Results: From a total of 234 fractures that met the inclusion criteria, 159 (64.96%) suffered closed fractures and 75 (32.05%) where open fractures. According to the AO classification system: 152 (64.10%) were simple patterns 42.A; 49 (20.94%) wedge type patterns 42.B and 33 (14.10%) complex patterns 42.C. Ten patients, a 4.27% of the sample, shown an increased talocrural angle in the postoperative radiographs, evidencing shortening of the fibula. Nine patients underwent surgery, the remaining patient was lost to follow-up. All the treated patients presented restoration of the normal talocrural angle. Conclusion: The incidence of syndesmotic injuries associated with high-energy tibial shaft fractures reaches 4.27%. We think that is necessary to evaluate the ankle and syndesmosis in all tibial shaft fractures, even with high-energy patterns, not only in spiral patterns.(AU)

Syndesmosis injury associated with high-energy tibial shaft fractures: Case series of a misdiagnosis rupture / Ruptura de la sindesmosis asociada a fracturas diafisarias de tibia de alta energía: serie de casos de una lesión habitualmente inadvertida

Introduction: Ankle syndesmosis injuries can be associated with a spiral mechanism on tibial shaft fractures. We are not aware if there is evidence of the incidence of ipsilateral syndesmotic lesson associated to high-energy tibial shaft fracture mechanisms. The aim of this study was to analyze the incidence of syndesmotic injuries associated with high-energy tibial shaft fractures. Methods: 233 diaphyseal tibial fractures operated between January 2007 and January 2017, the fracture patterns were analyzed, they were classified according to AO, the talocrural angle was measured, they analyzed failures and reoperations and described a novel failure method. Results: From a total of 234 fractures that met the inclusion criteria, 159 (64.96%) suffered closed fractures and 75 (32.05%) where open fractures. According to the AO classification system: 152 (64.10%) were simple patterns 42.A; 49 (20.94%) wedge type patterns 42.B and 33 (14.10%) complex patterns 42.C. Ten patients, a 4.27% of the sample, shown an increased talocrural angle in the postoperative radiographs, evidencing shortening of the fibula. Nine patients underwent surgery, the remaining patient was lost to follow-up. All the treated patients presented restoration of the normal talocrural angle. Conclusion: The incidence of syndesmotic injuries associated with high-energy tibial shaft fractures reaches 4.27%. We think that is necessary to evaluate the ankle and syndesmosis in all tibial shaft fractures, even with high-energy patterns, not only in spiral patterns.(AU)

Introducción: Las fracturas diafisarias espiroideas de tibia pueden asociarse a lesiones sindesmales del tobillo. No tenemos conocimiento de que exista evidencia sobre la incidencia de lesiones sindesmales ipsilaterales asociadas a los mecanismos de fractura de tibia de alta energía con patrones oblicuos y transversos. Nuestro objetivo fue analizar retrospectivamente una serie de pacientes que presentaron rotura de la sindesmosis asociada a fracturas diafisarias de tibia con patrones oblicuos y transversos y evaluar la incidencia en nuestro medio. Métodos: Del total de 233 fracturas diafisarias de tibia operadas entre enero de 2007 y enero de 2017, se analizaron los patrones de fractura, se clasificaron según AO, se midió el ángulo talocrural, se analizaron los fracasos y reoperaciones y se describe un método poco conocido de fracaso. Resultados: De 234 fracturas que cumplieron los criterios de inclusión, 159 (64,96%) sufrieron fracturas cerradas y 75 (32,05%) expuestas. Según el sistema AO: 152 (64,10%) fueron patrones simples 42.A; 49 (20,94%) patrones tipo cuña 42.B, y 33 (14,10%) en patrones complejos 42.C. Diez pacientes presentaron acortamiento del peroné, evidenciado por el aumento del ángulo talocrural en las radiografías postoperatorias, suponiendo un 4,27% de la muestra. Nueve pacientes requirieron cirugía; el paciente restante se perdió en el seguimiento. Todos los pacientes presentaron restauración del ángulo talocrural normal. Conclusión: La incidencia de lesiones sindesmales inadvertidas asociadas a fracturas diafisarias de tibia oblicuas y transversas llega al 4,27% en nuestra serie. Consideramos necesaria la evaluación del tobillo y la sindesmosis en todas las fracturas diafisarias de tibia, aun con patrones de alta energía y no solo en patrones espiroideos, a fin de lograr mejores resultados y evitar secuelas e intervenciones futuras.(AU)

Current Techniques in Total Ankle Arthroplasty.

Total ankle replacement (TAR) continues to increase in popularity as a motion-preserving option to ankle arthrodesis. TAR is indicated for primary, posttraumatic and inflammatory arthropathies as an alternative procedure to tibiotalar arthrodesis. Proper patient selection is paramount to a successful outcome in TAR. Contraindications to TAR include the presence of neuropathy, active infection, severe peripheral arterial disease, inadequate bone stock, and severe uncorrectable coronal plane deformity. This article is a brief overview of techniques and PEARLS on how to address a well-aligned ankle joint, varus deformity as well as valgus deformities as well as the authors' experience with single versus staging coronal plane deformities.

Triple Hemisection Percutaneous Achilles Tendon Lengthening for Severe Ankle Joint Deformity.

OBJECTIVE: To investigate the efficacy of modified percutaneous Achilles tendon lengthening for severe ankle joint deformity. METHODS: This retrospective case series study included 33 patients with an average age of 25.2 years who underwent surgery in our hospital from April 1, 2010 to March 1, 2018. Triple hemisection percutaneous Achilles tendon lengthening was performed. One stage surgery, other soft tissue surgery or bone correction surgery could be performed. After surgery, a plaster cast was used to fix the functional position, and rehabilitation training was carried out as planned. Complications during the perioperative period were recorded. Statistical analysis of the patients' visual analogue scale (VAS) and American Orthopedic Foot and Ankle Society (AOFAS) score before and at the last follow-up was performed. The recurrence rate of Achilles tendon contracture at the last follow-up and the patients' satisfaction rate were investigated. RESULTS: All patients were followed up, with an average follow-up period of 56.31 months (8-104 months). All achieved good ankle joint function and appearance improvement And there were no infection or skin necrosis complications. In two cases, the incision was poorly healed at non-Achilles tendon site and was cured by change of dressing. The average VAS score at the last follow-up was reduced from (2 ± 1.48) points before surgery to (0.26 ± 0.51) points (P = 0.001), and the average AOFAS score was increased from (64.97 ± 13.56) points before surgery to (90.06 ± 10.06) points (P = 0.001). During the follow-up period, there was no chronic rupture of Achilles tendon. There were two cases of recurrence of foot drop (5.7%), and the patients' satisfaction rate was 93.9%. CONCLUSION: In the surgical treatment of severe ankle joint deformity, the application of triple hemisection percutaneous Achilles tendon lengthening for Achilles tendon contracture has the advantages of less trauma, beautiful incision, and reliable efficacy. The satisfaction rate of patients with this treatment is high, and it is worth promoting in the clinic.

Consideration for Total Ankle Replacement in the Varus Ankle and Cavovarus Foot Type.

The varus ankle and cavus foot pose challenges in surgical correction with regard to total ankle replacement surgery. Etiology of cavus foot type and varus ankle must be evaluated and confirmed. Pes cavus is increased height of the arch with metatarsus adductus and increased calcaneal inclination angle. There often is intrinsic musculature irregularity leading to imbalance of the foot. Although not all cavus foot types and varus ankle deformities are sequelae of neuromuscular disorder, neurologic etiology must be considered. Attaining neutral alignment of ankle joint articular surface is paramount to longevity and functionality of ankle joint replacement implant.

Osteotomy combined with lateral ligament reconstruction in treating osteochondral lesion in patients with talar injury and varus ankle.

ABSTRACT: This study aimed to investigate the therapeutic effects of osteotomy combined with lateral ligament reconstruction on the osteochondral lesion of patients with talar injuries and varus ankles.Seventy five patients with talar injuries and varus ankles who received osteotomy combined with lateral ligament reconstruction for the osteochondral lesions from June 2008 to December 2014 were retrospectively reviewed. Patients were followed up for 32.4 ±â€Š15.3 months after surgeries, and the AOFAS-AH score, VAS score and SF36 score were determined preoperatively and postoperatively. The iconographic data were compared preoperatively and postoperatively, including tibial anterior surface angle (TAS), TTS, TT, and tibial lateral surface angle (TLS) angles.After surgeries, the AOFAS-AF score increased from 43.2 ±â€Š8.1 to 82.1 ±â€Š5.6, the VAS score decreased from 6.9 ±â€Š2.3 to 1.8 ±â€Š1.5, and the SF36 score increased from 48.7 ±â€Š9.4 to 83.5 ±â€Š6.2. TAS increased from 83.3 ±â€Š5.1 to 90.3 ±â€Š6.1, TTS increased from 70.3 ±â€Š6.1 to 82.5 ±â€Š5.4, TT decreased from 12.9 ±â€Š6.1 to 6.9 ±â€Š5.7, and TLS increased from 76.5 ±â€Š4.1 to 81.2 ±â€Š3.3 (P < .05).Osteotomy combined with lateral ligament reconstruction is effective for the treatment of talar osteochondral lesion with varus ankle, which could relieve the arthritic symptoms induced by cartilage lesions. By correcting the force line on lower limbs and metapedes with osteotomy completely, the treatments on talar osteochondral lesion and lateral ligament reconstruction are the critical factors with better results.

Alignment of the hindfoot in total knee arthroplasty: a systematic review of clinical and radiological outcomes.

AIMS: Patients with a deformity of the hindfoot present a particular challenge when performing total knee arthroplasty (TKA). The literature contains little information about the relationship between TKA and hindfoot alignment. This systematic review aimed to determine from both clinical and radiological studies whether TKA would alter a preoperative hindfoot deformity and whether the outcome of TKA is affected by the presence of a postoperative hindfoot deformity. METHODS: A systematic literature search was performed in the databases PubMed, EMBASE, Cochrane Library, and Web of Science. Search terms consisted of "total knee arthroplasty/replacement" combined with "hindfoot/ankle alignment". Inclusion criteria were all English language studies analyzing the association between TKA and the alignment of the hindfoot, including the clinical or radiological outcomes. Exclusion criteria consisted of TKA performed with a concomitant extra-articular osteotomy and case reports or expert opinions. An assessment of quality was conducted using the modified Methodological Index for Non-Randomized Studies (MINORS). The review was performed according to the Preferred Reporting Items for Systematic Reviews and Meta-analyses (PRISMA) guidelines and registered in the PROSPERO database (CRD42019106980). RESULTS: A total of 17 studies were found to be eligible for review. They included six prospective and ten retrospective studies, and one case-control study. The effects of TKA showed a clinical improvement in the hindfoot deformity in three studies, but did not if there was osteoarthritis (OA) of the ankle (one study) or a persistent deformity of the knee (one study). The radiological alignment of the hindfoot corrected in 11 studies, but did not in the presence of a rigid hindfoot varus deformity (in two studies). The effects of a hindfoot deformity on TKA included a clinical association with instability of the knee in one study, and a shift in the radiological weightbearing axis in two studies. The mean MINORS score was 9.4 out of 16 (7 to 12). CONCLUSION: TKA improves both the function and alignment of the hindfoot in patients with a preoperative deformity of the hindfoot. This may not apply if there is a persistent deformity of the knee, a rigid hindfoot varus deformity, or OA of the ankle. Moreover, a persistent deformity of the hindfoot may adversely affect the stability and longevity of a TKA. These findings should be interpreted with caution due to the moderate methodological quality of the studies which were included. Therefore, further prospective studies are needed in order to determine at which stage correction of a hindfoot deformity is required to optimize the outcome of a TKA. Cite this article: Bone Joint J 2021;103-B(1):87-97.

Time-frequency analysis of muscle activation patterns in people with chronic ankle instability during Landing and cutting tasks.

BACKGROUND: People with chronic ankle instability (CAI) exhibit neuromuscular deficits. Previous studies, however, only investigated magnitudes of muscle activation and not the time-frequency domain. RESEARCH QUESTION: Do people with CAI exhibit differences in muscle activation patterns in the time-frequency domain during landing, anticipated cutting, and unanticipated cutting compared to matched controls? METHODS: Eleven people with CAI and eleven healthy matched controls (CON) performed landing, anticipated cutting, and unanticipated cutting as surface EMG of the lateral gastrocnemius, medial gastrocnemius, fibularis longus, soleus, and tibialis anterior were recorded. The time-frequency domain of surface EMG data was analyzed with wavelet transformations and principal component analysis (PCA), PC scores were compared across group, task, and muscle with three-way ANOVAs. RESULTS: The PCA extracted two PCs that captured the overall magnitude (PC1) of wavelet intensities across the time-frequency domain and a shift among the range of frequencies (PC2) where wavelet intensities were most prominent. A main effect for group indicated that people with CAI demonstrated smaller (p = 0.009) PC1 scores than people in the CON group across all muscles and tasks. An interaction between group and task indicated that people in the CAI group exhibited smaller (p = 0.041) PC2 scores than people in the CON group during only anticipated cutting. SIGNIFICANCE: People with CAI exhibited neuromuscular deficits in the time-frequency domain of EMG during dynamic tasks. These deficits appear to reflect a neuromuscular strategy characterized by the recruitment of fewer motor units in ankle muscles regardless of task, and an inability to scale the recruitment of motor units in the frequency domain in response to different task demands. Rehabilitation for people with CAI should consider that this population exhibits differences in neuromuscular control that exist not only in the overall magnitudes, but also in the time-frequency domain, of muscle activation patterns.

Comparison of suture-button and screw fixation in the treatment of ankle syndesmotic injuries: Cohort study protocol.

BACKGROUND: Syndesmotic injuries account for a significant number of ankle injuries. There is no consensus regarding the recommended method of treatment. The purpose of this study was to evaluate: METHODS:: This study was performed and reported in accordance with the Strengthening the Reporting of Observational studies in Epidemiology checklist. The records of 200 patients with ankle fractures who had undergone surgical treatment in our clinics between January 2014 and January 2018 were retrospectively investigated. This retrospective cohort study was approved by the institutional review board in the 2nd Hospital of Jilin University. The primary outcome measure was the American Orthopaedic Foot and Ankle Society ankle-hindfoot scale and the Foot Function Index. Secondary outcome measures included visual analog scale score, complications, range of movement of ankle, reoperations, and radiologic outcomes. For statistical comparison of the clinical and radiologic findings between the 2 groups, we used SPSS, version 21.0 (SPSS, Chicago, IL), statistical software. P Values of < .05 were considered statistically significant. CONCLUSION: The hypothesis was that the SB technique would achieve better functional outcomes as compared to the syndesmotic screw technique after surgery. TRIAL REGISTRATION: This study protocol was registered in Research Registry (researchregistry5793).

The "Ball in Basket" Technique for Tibiotalocalcaneal Fusion.

Tibiotalocalcaneal arthrodesis (TTCA) in severe bone deficit represents a complex challenge for expert orthopedic surgeons also. This study aims to illustrate a surgical technique, defined as "ball in basket", that facilitates the fitting of the structural bone graft (femoral head from bone bank) and its placement, in order to fill the bone gap during instrumented arthrodesis. The proposed technique includes the preparation of the recipient bone surfaces with acetabular convex reamers and of concave reamers to shape the bone graft from bone bank. This preparation guarantees a maximum congruence of the bone surfaces and a greater stability of the bone graft during the placement of the fixation devices to optimize the bone fusion and to provide a good patient clinical outcome. The preliminary results obtained for two patients, initially presenting with severe anatomical deformity associated with severe bone gap, are described. Patients underwent clinical and radiographic follow-up evaluations (respectively at 4 and 30 months of follow-up) showing radiographic healing and good functional recovery. The results are encouraging, although long-term studies and a wider cohort of patients are necessary to consider this technique a reliable aid in case of severe bone deficit. (www.actabiomedica.it).

Foot and ankle abnormalities among a cohort of Nigerian school children: an epidemiological study.

PURPOSE: Foot and ankle problems in children are a common cause for paediatric orthopaedic referrals. There is a variation in the reported epidemiology of foot and ankle abnormalities across the globe. The prevalence in our locality was unknown. The objective of this study was to determine the prevalence pattern of foot and ankle problems in our locality as well as compare with patterns from other geographical locations to determine the presence or otherwise, of differences among varying populations. METHODS: One thousand seven hundred and fifty-eight Nigerian primary school children aged between five and 13 years were clinically evaluated, checking for weight, height and calculation of BMI. The heel axis angle and hallux angle were measured clinically while determination of flatfeet or high arched feet was made from analysis of foot imprints. RESULTS: Hindfoot valgus was the commonest abnormality of the foot and ankle in this population with a prevalence of 34.2% and predominantly in females and older children, while hallux valgus and a high arched foot were the least common abnormalities at 0.6 and 0.7% prevalence rates, respectively. We found no statistically significant relationship between BMI and hindfoot valgus. CONCLUSION: Hindfoot valgus is the commonest foot and ankle abnormality among primary school children in our locality.

Quantitative assessments of static and dynamic balance performance in patients with chronic ankle instability.

Patients with chronic ankle instability (CAI) have postural-control deficits during center-of-pressure excursions than do healthy individuals. While an external analysis of center-of-pressure excursions in CAI has been performed, a quantitative analysis of center-of-gravity movements, to detect the balance deficits associated with CAI, has yet to be performed. Therefore, the aim of the study is to quantify the balance deficits in patients with unilateral CAI.Forty-four patients with unilateral CAI (24 men; age, 31.7 ±â€Š5.5 years) and 26 uninjured volunteers (12 men; age, 28.6 ±â€Š5.9 years) underwent Neurocom Balance Manager assessments of dynamic and static balance responses in limits of stability, unilateral stance, and forward lunge tests.In the limits of stability test, there were no significant group differences in the forward direction; however, reaction times were longer in the CAI group than in the control group in the backward (P = .037, effect size [ES] = 0.49) and rightward directions (P = .032, ES  = 0.47). Furthermore, the CAI group showed more excursions in the rightward (P = .046, ES = 0.50) and leftward directions (P = .002, ES = 0.80), and less directional control in the leftward direction (P = .036, ES = 0.59). In the unilateral stance test, the center of gravity sway velocity was faster in the CAI group than in the control group, whether eyes were opened or closed (P < .05). There were no significant group differences in forward lunge-test outcomes.Patients with CAI have poor static and dynamic balance performance compared to that in healthy counterparts. Thus, balance retraining should be an essential component of rehabilitation programs for patients with CAI.

Accessory anterolateral talar facet: analysis of the morphologic features on MRI.

PURPOSE: To analyze the morphologic features of accessory anterolateral talar facet (AALTF) on MRI that can assist in detecting this entity, identify any associated structural changes and also define its MRI prevalence. METHODS: Two radiologists retrospectively evaluated 140 ankle MRI scans for the presence of AALTF, complimentary anterior calcaneal extension facet and angle of Gissane measurement. One observer evaluated the scans for other structural details including AALTF length, cartilage thickness, bone marrow edema, hind foot coalition and talar beaking. RESULTS: There was a good inter-observer agreement for the detection of AALTF on MRI (Kappa = 0.64). AALTF was present in 33 out of 140 (23.6%) scans. There was no significant difference in the prevalence of AALTF between male and female subjects (P = 0.71). No significant difference in age between those with and those without AALTF (P = 0.96). Angle of Gissane was significantly smaller in ankles with AALTF (P = 0.0367, observer 1 and 0.0003, observer 2). AALTF had a mean length of 7 mm and was covered with cartilage in 25/33 (75.8%) with mean cartilage thickness of 1.4 mm. Complimentary cartilage covered anterior calcaneal facet was demonstrated in 10/33 (30.3%) and had a mean cartilage thickness of 2.5 mm. Talar beaking was more prevalent in ankles with AALTF showing an anterior calcaneal extension facet than those without the latter feature (P = 0.02). CONCLUSION: AALTF is a frequently observed feature on ankle MRI, with good inter-observer reliability for its detection. When present, it is often opposed by a cartilage covered anterior calcaneal extension facet, which can be associated with talar beaking.

Morphological features of the deep component of the posterior inferior tibiofibular ligament.

PURPOSE: The deep component of the posterior inferior tibiofibular ligament (PITFL) was classified by type in this large-scale cadaveric study to provide basic information that will help elucidate the mechanisms underlying ankle joint posterior impingement syndrome. METHODS: This investigation examined 100 legs from 49 Japanese cadavers (mean age at death, 79 ± 11 years; 58 sides from men, 42 from women). In classification, absence of an independent fiber of the deep component of the PITFL were classified as Type I, an independent fiber of the deep component of the PITFL was classified as Type II-a, an independent fiber of the deep component of the PITFL with bundles of fibers connected to the posterior intermalleolar ligament (PIML) was classified as Type II-b, and an independent fiber of the deep component of PITFL with a band shape connected to the PIML was classified as Type III. RESULTS: A deep component of the PITFL was present in all specimens. An independent fiber of the deep component of the PITFL was present in 37 legs (37%), connecting to the deep component of the PITFL and PIML in 26 (70.3%). Several types of deep component of the PITFL were identified: Type I in 63 legs (63%); Type II-a in 11 (11%); Type IIb in 12 (12%); and Type III in 14 (14%). No significant differences were seen between the right and left legs. Type I male were significantly more than Type I female (p < 0.05). Type III female were significantly more than Type III male (p < 0.05). CONCLUSIONS: Strong relationships exist between the PITFL and PIML.

Configuration design and correction ability evaluation of a novel external fixator for foot and ankle deformity treated by U osteotomy.

As a basic osteotomy technique, U osteotomy can be applied for certain complex foot and ankle deformities. Gradual correction cases using Ilizarov apparatus and Taylor Spatial Frame have been reported. This paper proposes a novel parallel distraction apparatus for U osteotomy (PDA-Uos) to supplement the correction equipment for surgeon. Designed with an adjustable structure, the PDA-Uos can adopt different assembly shapes (joint connection points). However, the influence of the change in assembly shape on interference-free workspace and self-structural performance of the external fixator have received little attention. To address this issue and enhance the selection of the most suitable assembly shape for patient, an algorithm to obtain the interference-free workspace of different assembly shapes is proposed based on the inverse position solution of the PDA-Uos. Additionally, correction ability indices are defined according to the requirements of accurately controlled motion and high structural stiffness of the external fixator along the correction path. The results of simulation cases indicate that the interference-free workspace and the correction ability vary according to the assembly shape and thus the proposed method can be used to select an assembly shape with sufficient workspace and the best correction ability before performing correction for a given patient. Graphical abstract.

Outcomes of Total Ankle Arthroplasty in Ankles with >20° of Coronal Plane Deformity.

BACKGROUND: A preoperative severe coronal plane deformity of >20° has been considered a contraindication for total ankle arthroplasty. We aimed to evaluate whether outcomes of total ankle arthroplasty in ankles with severe coronal plane deformity (20° to 35° of varus or valgus) are comparable with those with moderate deformity (5° to 15° of varus or valgus). METHODS: A total of 148 consecutive ankles (142 patients) that underwent primary total ankle arthroplasty using the HINTEGRA prosthesis were included. The overall mean follow-up duration was 74 months (range, 24 to 160 months). We divided all patients into 2 groups according to the preoperative coronal plane tibiotalar angle: the severe group (36 patients, 41 ankles) and the moderate group (106 patients, 107 ankles). Clinical and radiographic outcomes were analyzed for intergroup differences, and multivariable regression was used to adjust for baseline characteristics. Patients in each group showed similar characteristics in mean age, sex, mean body mass index, and median follow-up duration. RESULTS: At a mean follow-up of 74 months, we found no significant intergroup difference in the Ankle Osteoarthritis Scale pain and disability score, American Orthopaedic Foot & Ankle Society ankle-hindfoot score, Short Form-36 Physical Component Summary score, visual analog scale pain score, or ankle range of motion (p > 0.05). However, the final tibiotalar angle, talar tilt angle, and number of outliers were greater in the severe group (p < 0.05). Complication rates did not show a significant difference between the 2 groups (p > 0.05). The overall survival probability of the implant was 91.3% (92.3% in the severe group and 90.7% in the moderate group) (p = 0.354). CONCLUSIONS: Total ankle arthroplasty in ankles with preoperative severe coronal plane deformity showed satisfactory and comparable clinical outcomes without increasing complication rates relative to those with moderate deformity in the intermediate-term follow-up. Our results suggested that total ankle arthroplasty may be considered in ankles with deformity of >20°. LEVEL OF EVIDENCE: Prognostic Level III. See Instructions for Authors for a complete description of levels of evidence.

Incidence of symptomatic os trigonum among nonathletic patients with ankle sprain.

PURPOSE: Os trigonum syndrome is a rare condition, often affecting athletes. A paucity of data exists on the incidence of os trigonum syndrome in nonathletic population. The study aimed to determine the incidence and clinical characteristics of os trigonum syndrome in nonathletic patients with sprained ankles. METHODS: The sample consisted of 798 adolescent and adult patients that attended the emergency department or Foot and Ankle Clinic with acute ankle sprain. Lateral and/or oblique lateral radiographs of the feet were screened for the presence of os trigonum in relation to age and gender. A cohort of 163 patients with os trigonum was followed up prospectively over a 48-month period to correlate the presence of the os trigonum with patient symptomatology. RESULTS: Os trigonum was found in 20.4% (163/798) of sprained ankles. Patients aged 18-35 exhibited most os trigonum [42.3% (69/163)], with higher incidence in females. 5.5% (9/163) of the os trigonum patients developed an os trigonum syndrome after a standard treatment of an ankle sprain [3.8% (3/78) of males and 7.1% (6/85) of females]. Females aged between 18 and 35 years had higher incidence of os trigonum syndrome compared to males of a similar age. CONCLUSION: Os trigonum syndrome should be suspected in nonathletic patients with an ankle sprain unresponsive to standard treatment. About 1.1% of acute ankle sprain patients develop an os trigonum syndrome. This finding can help identify the source of a patient's symptoms, leading to an accurate diagnosis, appropriate treatment and reducing the potential chronic symptoms.