Pronation Angle Research Articles

Effects of Gait Speed and Sole Adjustment on Shoe–Floor Angles: Measurement Using Shoe-Type Sensor

Background: Assessment of walking with shoes is important for understanding different types of walking in various environments. Methods: In this study, a shoe-type sensor was used to demonstrate the shoe–floor angle in fifteen participants who walked on a treadmill under varying gait speed and sole adjustments, lifting one side of the sole. The shoe–floor angle in the sagittal; the angle of toe-up (θTup) and toe-down (θTdown) and frontal planes; and the angle of pronation (θPro) and supination (θSup) were calculated, and angles at the initial contact and maximum angles were extracted. Results: The results showed that most angles significantly increased with an increase in the gait speed (θTup and θTdown; p < 0.01 both, θPro and θSup; p < 0.02 and 0.04). Conversely, only the supination angle at the initial contact changed significantly, owing to the tilt of the sole (p < 0.01). Conclusion: Shoe movements were more strongly affected by gait speed than by sole adjustment.

The Impact of Postural and Anthropometric Properties of Foot and Ankle on Physical Performance and Ambulation of Patients with Duchenne Muscular Dystrophy.

Abnormal foot anthropometry and posture of patients with Duchenne Muscular Dystrophy (DMD) can be considered as possible risk factors for performance and ambulation. It was aimed to examine the effects of foot posture and anthropometric characteristics, which deteriorated from the early period, on ambulation and performance of patients with DMD. The foot arch height (FAH), the metatarsal width (MW), subtalar pronation angle, and ankle limitation degree (ALD) were evaluated to determine the foot anthropometric characteristics of the patients. Foot Posture Index-6 (FPI-6) was used to evaluate foot posture. The performance of the patients was determined by the 6-minute walk test (6MWT), the 10-meter walk test (10MWT), and ascend/descend a standard 4-step test, and the ambulation was determined by the North Star Ambulatory Assessment (NSAA). Spearman's correlation coefficient was calculated to assess the relationship between foot anthropometric characteristics and posture, and performance and ambulation. The sample consisted of 48 patients with DMD aged 5.5 to 12 years. Both of the right and left foot FPI-6 scores were associated with all parameters, except descending 4-step. The left FAH was associated with 6MWT and NSAA, and the left MW was associated with 6MWT. The ALD of right foot was associated with 6MWT, ascending/descending 4 steps, and NSAA, and left ankle limitation was associated with NSAA (p<0.05). There was no relationship between other parameters. These findings suggest that postural disorders in the foot and ankle may contribute to the decrease in performance and ambulation in patients with DMD.

Lower limb kinematic changes during gait after hallux valgus surgery: A prospective observational study

BackgroundPatients with hallux valgus are known to alter lower limb joint kinematics during gait. However, little information is available about gait changes following hallux valgus surgery. We aimed to longitudinally investigate lower limb kinematic changes at the mid and terminal stances of gait after hallux valgus surgery. MethodsThis prospective observational study included 11 female patients (17 feet), who underwent first metatarsal osteotomy. Gait analyses were performed preoperatively and 1- and 2-year postoperatively using a three-dimensional motion capture system. Toe-out angle, ankle, knee, and hip joint angles during gait were calculated from the recorded data. The spatiotemporal parameters and these angles at the mid and terminal stances of gait were statistically compared between preoperative and postoperative periods. FindingsAll spatiotemporal parameters remained unchanged postoperatively. The toe-out angle was significantly greater at 1- and 2-year postoperatively. The ankle pronation angle, the knee abduction angle, and the hip adduction angle at the mid and terminal stances of gait were smaller postoperatively compared to the preoperative. These angular changes showed a similar trend at 1 and 2 years postoperatively. However, the postoperative changes of the sagittal joint angles were relatively small. InterpretationHallux valgus surgery can affect the toe-out angle and the lower limb coronal kinematics at the mid and terminal stances of gait in patients with hallux valgus. However, surgical correction of hallux valgus deformity did not directly improve the gait characteristics in patients with hallux valgus.

Radiologic and Clinical Outcomes of the Dovetailed Notch Scarf Osteotomy for Correcting the First Metatarsal Pronation in Moderate to Severe Hallux Valgus Deformity: A Comparative Study.

The traditional scarf osteotomy (TSO) has limited ability to correct the first metatarsal pronation. A novel modification that we refer to as a "dovetailed notch scarf osteotomy" (DNSO) has been developed to enhance the ability to correct coronal plane pronation. The study aimed to observe and compare TSO to DNSO in the treatment of moderate to severe hallux valgus deformity. This retrospective study included 78 feet that had a TSO and 105 feet that had a DNSO. Minimum follow-up was 24 months. Weightbearing computed tomography (WBCT) and weightbearing anterior-posterior (AP) radiographs were taken preoperatively and at the last follow-up. We measured the intermetatarsal angle (IMA), hallux valgus angle, distal metatarsal articular surface angle on AP radiographs and first metatarsal coronal pronation angle (α angle), tibial sesamoid coronal grading, and first metatarsal length on WBCT. Clinical assessment was done using visual analog scale (VAS), American Orthopaedic Foot & Ankle Society (AOFAS) ankle-hindfoot scale, Foot and Ankle Ability Measure (FAAM), and the 36-Item Short Form Health Survey (SF-36). The occurrence of postoperative complications was also documented. The DNSO group exhibited a significantly higher correction amount of α angle and IMA (14.3 ± 9.9 and 10.3 ± 4.6 degrees) than the TSO group (8.6 ± 5.9 and 5.4 ± 5.9 degrees) during the final follow-up assessment (P < .05).The DNSO group (10.1 [8.0-12.0] degrees and 4.8 [3.9-5.6] degrees) demonstrated significantly smaller α angle and IMA compared with the TSO group (4.8 [3.9-5.6] degrees and 9.5 [7.5-11.5] degrees) at 24 months postsurgery (P < .05). The postoperative FAAM activities of daily living and SF-36 physical functioning scores were significantly higher in the DNSO group (97.2 ± 3.3 and 95.7 ± 4.4 points) compared with the TSO group (92.3 ± 3.3 and 87.7 ± 8.7 points) (P < .05). Additionally, hallux varus occurred in 1 case in the DNSO group, whereas 4 cases were observed in the TSO group. Two osteotomy methods can effectively correct moderate to severe hallux valgus deformity. Compared with the TSO, the DNSO has stronger correction ability. The most crucial aspect lies in its controllability when correcting first metatarsal pronation and addressing IMA. Level III, retrospective comparative study.

Preoperative increased pronation angle of the first metatarsus associated with correction loss after hallux valgus surgery: A semi-weight-bearing computed tomography study

BackgroundThe effect of preoperative first metatarsal pronation on postoperative prognosis of hallux valgus (HV) surgery is under investigation. Utilizing semi-weight-bearing computed tomography, the preoperative pronation angle was assessed to quantify its impact on postoperative prognosis. MethodsIn a retrospective analysis of 31 feet, those with re-increased hallux valgus angle postoperatively were classified as the non-maintained group, and the remainder as the maintained group. Preoperative pronation angles were compared to establish a threshold. Subsequently, feet were re-classified into high or low-pronation categories. The relative risk of non-maintenance in high-pronation category was calculated. ResultsThe non-maintained group exhibited a significantly higher preoperative pronation angle (p = 0.021), with a 28.4º threshold. The high-pronation category had a relative risk of 2.34 for non-maintenance. ConclusionsIncreased preoperative first metatarsal pronation angle is associated with correction loss after HV surgery. Utilizing sWBCT to measure the pronation angle provides valuable insights into postoperative prognosis. Level of evidenceIII

Coxa pedis: can calcaneal pronation angle be considered a predictive sign of medial plantar arch overload?

PurposeTo assess whether a correlation between the calcaneal pronation angle and the presence of internal plantar arch overload signs (such as upper-medial spring ligament lesion, posterior tibial tendon tenosynovitis, etc.) could lead to a better understanding of coxa pedis pathology.Material and methodsOne hundred ankle MRIs of consecutive patients were retrospectively reviewed measuring the calcaneal pronation angle and either the presence or absence of internal plantar arch overload signs. Next, the association of overload signs with increasing pronation angle was evaluated to establish a cut-off point beyond which coxa pedis pathology could be defined.ResultsThe tibial-calcaneal angle values in patients with and without effusion proved to be significantly different (p < 0.0001). The tibial-calcaneal angle values in patients with and without oedema also demonstrated a significant difference (p < 0.0056). Regarding posterior tibial tendon, a significant difference was found between the two groups (p < 0.0001). For plantar fascia enthesopathy, the result was borderline significant (p < 0.054). A linear correlation was found between the value of pronation angle and the extent of spring ligament injury (p < 0.0001). In contrast, no correlation with age was found.ConclusionIn conclusion, the literature associates medial longitudinal plantar arch overload with posterior tibial tendinopathy and spring ligament complex injuries. Our data show that both injuries are highly correlated with increased calcaneal pronation angle, which could be considered a predictive sign of internal plantar arch overload, prior to the development of the associated signs.

Upper-limb joint kinematics analysis of accuracy dart throwing at different vertical targets between different level dart players

Darts has evolved from a traditional pub room game to a professional sport. More and more people worldwide are participating in the sport of dart throwing. In order to enhance throwing performance, it is important to understand the mechanics of precise dart throwing techniques. Therefore, the purpose of this study was to investigate the fine-tune control of joint kinematics with different vertical targets between different skill levels to understand how to increase the success rate and generate precise fine-tuning of the motor system. Eight advanced players and eight intermediate players participated in this study. A motion capture system measured the kinematic data of the arm during throwing. The results indicated a significant interaction in shoulder internal rotation velocity (p = .031) and elbow supination velocity (p = .047) between advanced and intermediate groups with the different vertical targets. When intermediate players threw darts at different vertical targets, changes in shoulder internal rotation velocity and elbow supination velocity were observed. Conversely, these phenomena were not present in the advanced group. Additionally, we found that dart accuracy or light weight throwing requires an more angle of elbow pronation and generate high angular velocity of wrist palmar flexion during the release process. Based on the findings of this study, these results could provide a reference guide for dart throwing to improve the throwing performance.

Thumb Pronation Angle in Thumb Opposition Evaluated by the Nail Tip Angle of Thumb-Ring Finger Opposition.

This study aimed to devise the method for the evaluation of the thumb pronation angle and calculate its reference value. The study was conducted from October 2021 to March 2022, and 600 hands of 300 healthy volunteers were included in this study. The participants were divided into 6 age groups with 50 participants each. In study 1, 12 participants from group 1 were randomly selected, which included 6 male and 6 female participants. We measured the thumb pronation angle using FASTRAK system and the nail tip angle of thumb-ring finger opposition (T-R angle) and also evaluated the relation between them. In study 2, we measured the T-R angle of 600 hands of 300 healthy volunteers. The T-R angle mean (SD) and 95% confidence interval (CI) of each age group were calculated as reference values. The thumb pronation angle was correlated with the T-R angle. The T-R angle mean (SD) and 95% CI of the 6 groups were as follows: group 1, 142.5° (12.4) and 117.7 to 167.3; group 2, 139.9° (10.1) and 119.7 to 160.1; group 3, 142.3° (9.7) and 122.9 to 160.5; group 4, 140.2° (12.6) and 115.0 to 165.4; group 5, 138.3° (11.9) and 114.5 to 162.1; and group 6, 135.4° (13.0) and 109.4 to 161.4. The 95% CI tended to decrease with an increasing age. The T-R angle was a suitable evaluation method for the thumb pronation angle, and it should be evaluated by age groups.

Long-term functional result of vascularized bone graft for kienbock disease: A case report

Introduction: Kienbock's disease, or lunatomalacia, was a condition of aseptic osteonecrosis of the os lunatum, which can be progressively developed with a state of lunatum collapse, followed by complete os carpal collapse. This disease has been known for a long time, but until now, the exact cause of this disease could not be explained. . Case Presentation: We reported a 32-year-old female patient with pain in the right wrist; the pain was felt for five years before the surgery and is getting worse. On physical examination, Phalen's and Reverse Phalen's tests found pain and limited movement in the right wrist area. A collapse of the os lunatum was found after a radiological examination. The evaluation using the DASH score was an improvement in clinical conditions with the absence of pain on the right wrist after surgery using a vascularized bone graft. The clinical evaluation using Phalen's and Reverse Phalen's tests showed normal flexion and wrist extension results with no movement limitation around 0-90° flexion-extension. The wrist pronation and supination also showed normal results with pronation angles around 0-75° and supination angles around 0-85°. Conclusion: There were clinical, functional, and radiographic improvements in younger female patients with Kienbock's Disease treated with vascularized bone graft surgery six years after surgery.

A modern approach to the treatment of scoliosis with skewed pelvic bones by correcting asymmetric mobile planovalgus deformity of the feet

Introduction. The treatment of combined pathology of posture and feet remains an urgent problem of the child population.Target. To study the effectiveness of using an individually made wedge-shaped corrective heel pad for each foot in the treatment of grade I-II scoliosis with pelvic bone distortion due to asymmetric mobile flat-valgus deformity of the feet for 3 years.Object and methods. A comparison group and a main group were formed from 39 children and adolescents aged 3 to 15 years with grade I-II scoliosis with skewed pelvic bones and mobile flat-valgus deformity of the feet; patients underwent orthopedic examination every 6 months, radiography of the spine with pelvic bones, photoplantography, measurement of the pronation angle of the calcaneus, the study of quality of life indicators.Results. There was a decrease in clinical symptoms in 54.2 % of patients of the main group with regression of the II degree of scoliosis to the I degree, the pronation angle of the calcaneal bones decreased by 4.25 ± 0.78 ° with the preservation of minimal asymmetry after 3 years, a decrease in the difference of the iliac crests by 3 .64 ± 1.59 mm and the angle of scoliotic deformity of the spine on radiographs by 5.22 ± 1.36°. Correlation analysis showed a statistically significant strong and moderate direct relationship between the pronation angle of the left calcaneus and the angle of scoliotic spinal deformity on radiographs in the 1st and 3rd years of the study, as well as with the difference in the iliac crests throughout the study. The quality of life of patients of the main group with correction of the asymmetry of foot hyperpronation improved by 15.5 %, in the comparison group by 2.9 %.Conclusions. The results of the study confirmed the effectiveness of the use of individual wedge-shaped corrective heel pads for each foot in the treatment of grade I-II scoliosis with skewed pelvic bones due to asymmetric mobile flat-valgus deformity of the feet.

Thumb pronation efficacy of Camitz tendon transfer with insertion on the ulnar capsule of the metacarpophalangeal joint: a cadaver study.

Several studies have indicated that Camitz transfer for severe carpal tunnel does not adequately restore thumb opposition. The aim of this study was to determine whether modification of the distal insertion of the transferred palmaris longus tendon could provide more effective opposition. We used 12 fresh-frozen upper extremity specimens. For spatial analysis, we used a three-dimensional motion-tracking device. At 0 N and 5 N of traction force, the pronation angle was significantly larger for the modified procedure than for the conventional procedure. There was no significant difference in the palmar abduction angle between the two groups. The modified palmaris longus tendon insertion on the ulnar side of the thumb metacarpophalangeal joint provides more effective thumb pronation than conventional Camitz opponensplasty in a cadaver model. .

Correlation between whole-blood serotonin level and flexible pes planovalgus deformity in children and adolescents

Introduction Timely diagnosis, etiopathogenesis, treatment and prevention of the progression of pediatric flexible pes planovalgus (FPPV) are essential to prevent irreversible complications.The objective was to determine a correlation between whole-blood serotonin level and flexible pes planovalgus in children and adolescents over a period of four years with progression of the condition.Material and methods The whole-blood serotonin level was measured in children and adolescents aged 5-15 years with FPPV and compared with data from photoplantograms, a pronation angle of the calcaneus and radiographs of the feet. Based on serotonin measurements and photoplantograms, two groups were identified according to the course of flexible pes planovalgus and measurements during the next four years.Results Normal serotonin levels were maintained in the non-progressive FPPV group throughout the study with a 9.2 % decrease in the pronation of the calcaneus at 4 years. Progressive FPPV patients showed higher serum serotonin at one year with a 38.3 % increase at 4 years, increased pronation of the calcaneus by 21.2% and radiologically decreased height of the arch by 18.7 %. A moderate correlation between whole-blood serotonin levels, pronation of the calcaneus and the height of the foot arch was radiologically revealed in patients with a different course of FPPV. Analysis of the diagnostic effectiveness of the whole-blood serotonin test in patients with FPPV showed high sensitivity and specificity in predicting the risk of progression of FPPV.Discussion Literature review showed a paucity of research on clinical and laboratory detection of the progression of FPPV and examination of neurotransmitter mechanisms in the foot pathology. Plantography, 3D scanning and radiography were the main methods for the diagnosis of the flat feet.Conclusion The correlation between whole-blood serotonin level and flexible pes planovalgus in children and adolescents was identified and suggested involvement of the serotoninergic system in the formation and progression of foot pathology.

Do Arch Supports Alter Foot Alignment in Patients with Metatarsalgia? A Weightbearing CT and x-ray Study

Category: Midfoot/Forefoot; Lesser Toes Introduction/Purpose: Arch-support insoles are frequently included in the treatment plans for common foot ailments including metatarsalgia. Literature has demonstrated that insoles with metatarsal and arch support could relieve walking pain and improve patient-reported measures of function in metatarsalgia. The purpose of this study was to examine alterations in foot alignment among metatarsalgia patients who used arch support insoles. Methods: A clinical trial was initiated after the approval by the institutional review board. Patients with metatarsalgia (age: 18-65 y/o) were included after they consented to participate. Individuals with open wounds, feet asymmetry, using assistive device or brace, and those with BMI more than 35 were excluded. Participants underwent weightbearing computed tomography (WBCT), and weight-bearing x-ray of their feet while standing barefoot or on the insoles (Good Feet™, Dr.’s Own, LLC). The radiological measurements on WBCT and X-rays conducted in these patients are shown in Table 1. The Wilcoxon-Signed Rank test was used for comparison of the continuous measurements, and the interobserver reliability was analyzed with Intraclass Correlation Coefficient (ICC). Results: Ten patients with a mean age of 46.9±13.06 years were included in the study. Observed changes on X-rays include decreased 4th-5th intermetatarsal angle (p=0.04), 2nd-4th/2nd-5th metatarsal tangent angles (p=0.003, p=0.001), and 1st metatarsal length on antroposterior (AP) view (p=0.02). Also, 1st metatarsal declination angle (p=0.002), and talo-first metatarsal angle on AP view (p=0.05) were increased. No significant changes on the WBCT were found, except for a decrease in the first metatarsal pronation angle (p=0.02). Conclusion: Arch support insoles can bring about anatomical changes especially in the forefoot area of patients with metatarsalgia. While the causal correlation between these changes and alleviation of the symptoms cannot be proven based on our data, these outcomes can guide future clinical trials comparing different treatment for metatarsalgia to determine contributing factors to the healing process of this condition.

Association between Postoperative Medial: Middle Intercuneiform Joint Gapping and Recurrence Rates in Hallux Valgus

Category: Bunion; Midfoot/Forefoot Introduction/Purpose: Hallux valgus (HV) is a triplanar deformity of the first metatarsal, which may extend beyond the first ray. Compared with normal feet, previous studies have found that HV patients have an increase in hypermobility of the joints along the medial column and at the medial – middle (MM) intercuneiform joint. Despite increased instability at the MM intercuneiform joint, no study has investigated its clinical significance. The primary purpose of this study was to determine if postoperative widening of the MM intercuneiform joint was associated with recurrence in HV patients who undergo a first tarsometatarsal fusion (modified Lapidus procedure). A secondary purpose was to investigate whether other HV imaging parameters were associated with a widening of the MM intercuneiform joint. Methods: This study included 52 consecutive HV patients who underwent a modified Lapidus procedure and had preoperative and at least 5-month postoperative weightbearing CT (WBCT) scans. Preoperative and postoperative measurements of HV deformity, including the intermetatarsal angle and hallux valgus angle (HVA) on plain radiographs and triplanar pronation angle and sesamoid station from WBCTs, were performed as previously described. MM intercuneiform distance was measured on the coronal multiplanar reconstructed WBCT scans after reorienting the axial and sagittal planes such that the coronal cuts were orthogonal to the intercuneiform joint (Figure 1A). Recurrence of the HV deformity was defined as a postoperative HVA ≥ 20°. Paired t-tests were used to compare preoperative and postoperative imaging parameters, and Mann-Whitney U tests were used to compare measurements between patients with and without HV recurrence. Pearson correlation coefficients were used to explore associations between preoperative and postoperative measurements and the change in MM intercuneiform distance. Results: Nine of 52 patients (17.3%) had recurrence of their HV deformity. For the entire cohort, the mean preoperative and postoperative MM intercuneiform distances were 0.73 mm (standard deviation (SD) 0.3) and 1.08 mm (SD 0.5), respectively. In patients with and without HV recurrence, the mean widening at the MM intercuneiform joint was 0.69 mm (95% confidence interval (CI) 0.52-0.86) and 0.27 mm (95% CI 0.17-0.38, P&lt; 0.001), respectively. Patients with recurrence had significantly greater widening of the MM intercuneiform joint than patients without recurrence (P=0.001, Figure 1B and Table 1). While no preoperative imaging parameters were associated with a change in the MM intercuneiform distance, increasing postoperative sesamoid position (r=0.32, P=0.022) and HVA (r=0.28, P=0.046) were correlated with a greater change MM intercuneiform joint gapping. Conclusion: In patients undergoing a modified Lapidus procedure for correction of their HV deformity, postoperative widening of the MM intercuneiform joint was associated with recurrence of the HV deformity. As understanding of the HV deformity continues to evolve, our study suggests that there is a complex interplay between deformity at the hallux metatarsophalangeal (MP) joint, reduction of the metatarsosesamoid joint complex, and the instability at the tarsometatarsal and intercuneiform joints. This may guide surgical correction as surgeons may need to address both intercuneiform instability and correction at the hallux MP joint in order to decrease HV recurrence rates.

Evaluate the Influencing Factors of Congruency of the First Metatarsophalangeal Joint in Hallux Valgus Based on Weightbearing CT

The purpose of this study was to explore the difference between congruency and incongruency of the first metatarsophalangeal (MTP) joint in hallux valgus using weightbearing CT (WBCT) and to identify the risk factors for incongruency. From January 2019 to January 2021, WBCT scans were retrospectively analyzed for 110 (191 feet) consecutive patients. According to whether the metatarsal articular surface and phalanx articular surface were parallel, they were divided into congruency (73 feet) and incongruency groups (118 feet). The age, intermetatarsal angle (IMA), hallux valgus angle (HVA), distal metatarsal articular surface angle (DMAA), first metatarsal coronal pronation angle (α angle), tibial sesamoid 7 positions (TSP), and tibial sesamoid coronal grading (TSCG) were compared between the 2 groups. Binary logistic regression was used to analyze the influencing factors of incongruency. Receiver operating characteristic (ROC) curve analysis was applied to determine the cutoff value. There were significant differences in IMA, HVA, DMAA, α angle, age, TSP, and TSCG between congruency and incongruency groups (p < .05). Binary logistic regression analysis showed that TSCG, HVA, α angle were the influencing factors of incongruency. ROC curve analysis demonstrated that the cutoff values for incongruency were 1 position for TSCG (sensitivity: 0.835; specificity: 0.884) with the area under curve (AUC) of 0.892, 30° (sensitivity: 0.795; specificity: 0.812) for HVA with the AUC of 0.878, and 24° (sensitivity: 0.530; specificity: 0.797) for α angle with the AUC of 0.686. Incongruency of the first MTP joint indicated a more severe hallux valgus, and was associated with increased HVA, α angle, and TSCG.

First Metatarsal Rotation After Scarf Osteotomy for Hallux Valgus.

Recurrence after surgical correction of hallux valgus may be related to coronal rotation of the first metatarsal. The scarf osteotomy is a commonly used procedure for correcting hallux valgus but has limited ability to correct rotation. Using weight-bearing computed tomography (WBCT), we aimed to measure the coronal rotation of the first metatarsal before and after a scarf osteotomy, and correlate these to clinical outcome scores. We retrospectively analyzed 16 feet (15 patients) who had a WBCT before and after scarf osteotomy for hallux valgus correction. On both scans, hallux valgus angle (HVA), intermetatarsal angle (IMA), and anteroposterior/lateral talus-first metatarsal angle were measured using digitally reconstructed radiographs. Metatarsal pronation angle (MPA), alpha angle, sesamoid rotation angle, and sesamoid position were measured on standardized coronal WBCT slices. Preoperative and postoperative (12 mo) clinical outcome scores (Manchester Oxford Foot Questionnaire and Visual Analogue Scores) were captured. Mean HVA was 28.6 ± 10.1° preoperatively and 12.1 ± 7.7° postoperatively (P < .001). Mean IMA was 13.7 ± 3.8° preoperatively and 7.5 ± 3.0° postoperatively (P < .001). Before and after surgery, there were no significant differences in MPA (11.4 ± 7.7 and 11.4 ± 9.9°, respectively; P = .75) or alpha angle (10.9 ± 8.0 and 10.7 ± 13.1°, respectively; P = .83). There were significant improvements in sesamoid rotation angle (SRA) (26.4 ± 10.2 and 15.7 ± 10.2°, respectively; P = .03) and sesamoid position (1.4 ± 1.0 and 0.6 ± 0.6, respectively; P = .04) after a scarf osteotomy. There were significant improvements in all outcome scores after surgery. Poorer outcome scores correlated with greater postoperative MPA and alpha angles (r = .76 (P = .02) and .67 (P = .03), respectively). A scarf osteotomy does not correct first metatarsal coronal rotation, and worse outcomes are linked to greater postoperative metatarsal rotation. Rotation of the metatarsal needs to be measured and considered when planning hallux valgus surgery. Further work was needed to compare postoperative outcomes with rotational osteotomies and modified Lapidus procedures when addressing rotation.Level of Evidence: 4.

Sesamoid View Weightbearing Radiography vs Weightbearing Computed Tomography in the Measurement of Metatarsal Pronation Angle.

First metatarsal pronation angle (MPA) is increasingly relevant in the management of hallux valgus and is assessed on weightbearing computed tomography (WBCT) and sesamoid-view weightbearing radiography (WBR). The purpose of this study is to compare MPA measured by WBCT against WBR to determine if any systematic discrepancy in MPA measurement exists between the 2 modalities. A total of 40 patients with 55 feet were included for study. MPA was measured in all patients by 2 independent readers on both WBCT and WBR with an appropriate washout period between measurement modalities. Mean MPA by WBCT and WBR were analyzed; interobserver reliability was calculated with an intraclass correlation coefficient (ICC) value. Mean MPA as measured by WBCT was 3.7 ± 7.9 degrees (95% CI, 1.6-5.9; range -11.7 to 20.5). Mean MPA measured on WBR was 3.6 ± 8.4 degrees, (95% CI, 1.4-5.8; range -12.6 to 21.4). There was no difference in MPA as measured by WBCT compared to WBR (P = .529). Interobserver reliability was excellent with an ICC of 0.994 for WBCT and 0.986 for WBR. Measurement of first MPA by WBCT and WBR was not significantly different. In our cohort of patients with and without forefoot pathology, we found that either sesamoid view weightbearing radiographs or weightbearing CT can be used reliably to measure first MPA and will generate similar values. Level IV, case series.

Does pronator quadratus repair affect functional outcome following volar plate fixation of distal radius fractures? A systematic review and meta-analysis.

The study aimed to evaluate the efficacy of pronator quadratus (PQ) repair versus no repair following volar plate fixation of distal radius fractures. A comprehensive search was performed in PubMed, CNKI, EMBASE, Web of Science, Ovid, and Cochrane Library databases. All randomized controlled trials comparing PQ repair with no repair in distal radius fractures before January 2023 were included. Two investigators independently screened eligible articles, assessed the study quality, and extracted data from included studies. Continuous variables used standardized mean difference and 95% confidence interval as efficacy statistics. The meta-analysis was performed using the Revman 5.4 software. A total of 430 patients in 7 RCT studies were included in this meta-analysis, of which 218 underwent PQ repair, while 212 patients underwent no repair. The results of the meta-analysis displayed statistically significant differences in grip strength (short-term), pronation angle (short-term), and pronation strength (short- and long-term) between the two groups. No significant difference in other outcomes was found between the two treatment arms. The repair of PQ may further increase grip strength and pronation function in the short-term and enhance long-term pronator muscle strength compared to no repair. However, due to the small number of articles included in the study, the above conclusions need to be verified by a larger sample and multi-center clinical study.

Stress radiographic assessment of collateral ligament constraints on the feline tarsocrural joint.

This cadaveric study describes the collateral ligament constraints on the feline tarsocrural joint using stress radiography. Thirty-six feline cadaveric hindlimbs free of orthopaedic disease were placed in a custom-made jig and controlled stress radiography was performed before and after transection of one, or both collateral ligaments. Changes in varus and valgus deviation and pronation and supination were measured at three limb angles (extension, 120o flexion and 90o flexion). There was a significant positive percentage change in the mean angle of varus deviation after transection of the fibulocalcaneal ligament at all limb positions (extension: 41%, 120°: 78%, 90°: 63%). There was a significant positive percentage change in the mean angle of varus deviation after transection of the fibulotalar ligament at extension (14%). There was a significant positive percentage change in the mean angle of varus deviation after transection of both fibulocalcaneal and fibulotalar ligaments at all limb positions (extension: 58%, 120°: 67%, 90°: 67%), and in the mean angle of valgus deviation (100%) and supination (89%) at 90 degrees flexion. There was a significant positive percentage change in the mean angle of valgus deviation after transection of the tibiocentral ligament at all limb positions (extension: mean 79%, 120°: 43%, 90°: 49%) and the mean angle of pronation at 120 degrees flexion (10%). There was a significant positive percentage change in the mean angle of varus deviation after transection of the tibiotalar ligament at extension (11%) and at 90 degrees flexion (54%) and in the mean angle of pronation at all limb positions (extension: 11%, 120°: 19%, 90°: 32%). There was a significant positive percentage change in the mean angle of valgus deviation (extension: 255%, 120°: 172%, 90°: 176%) and pronation (extension: 58%, 120°: 134%, 90°: 76%) after transection of the tibiocentral and tibiotalar ligaments at all limb positions and in the mean angle of varus deviation at extension (13%) and 90 degrees flexion (69%). The medial collateral ligaments prevent against excessive valgus deviation and pronation, and the lateral collateral ligaments prevent against excessive varus deviation and supination. At 90 degrees flexion subluxation of the talus occurs on the ipsilateral side of the ligament injury resulting in an additional direction of instability.

Mathematical model of distal radius orientation.

Distal radius orientation is important in evaluating Colles' fracture. In most cases, the wrist was protected by a bandage, splint, or cast. Therefore, it was difficult for the radiology technician to take perfect anteroposterior and lateral view radiographs. In this study, we build a mathematical model and calculate the pronation angle needed to produce dorsal tilt, which is a volar tilt in a perfect lateral view radiograph. The formulas are all incorporated into Excel to facilitate usage.