American Orthopedic Foot and Ankle Society Hallux Metatarsophalangeal-Interphalangeal Joint Scale: A Cross-Cultural Adaptation and Validation Study in the Persian Language

Evaluating the Validity and Reliability of the Persian Version of American Orthopedic Foot and Ankle Society Midfoot Scale

BACKGROUND

The use of a valid and reliable outcome scoring system is crucial for evaluating the result of different treatment interventions. The aims of this study were to translate and culturally adapt the American Orthopaedic Foot and Ankle Society (AOFAS) midfoot scoring system into the Persian language and assess its validity and reliability.

METHOD

In total, 57 patients with midfoot injuries were enrolled. Forward-backward translation and cultural adaptation methods were used to develop the Persian version of AOFAS midfoot scoring system. Reliability and internal consistency were assessed using intraclass correlation coefficient (ICC) and Cronbach's alpha. The discriminant and convergent validities of the scoring system were assessed using the total score of the mental and physical component of SF-36.

RESULTS

The mean age of the participants was 46.2 ± 16.3 years. The intra-observer reliability of the totals core of the Persian version of AOFAS midfoot scoring system was 0.96 (confidence interval [CI]: 0.92-0.97) and the inter-observer reliability of the scoring system was 0.90 (CI: 0.86-0.95). The Persian version of AOFAS midfoot scoring system had acceptable convergence with physical component scoring system of SF-36 and its subscales (0.57); moreover, it had acceptable discriminant validity with the mental component of SF-36 and its subscales (0.36).

CONCLUSION

The Persian version of AOFAS midfoot is a reliable and valid instrument and could be used by Persian language clinicians and researchers.

LEVEL OF CLINICAL EVIDENCE

3.

Validity and Reliability of the American Orthopaedic Foot and Ankle Society Score for the English-Literate Singapore Population With Hallux Valgus

BACKGROUND

This study aimed to evaluate the reliability and validity of the American Orthopaedic Foot and Ankle Society Metatarsophalangeal-Interphalangeal (AOFAS MTP-IP) score in patients with hallux valgus in Singapore.

METHOD

A total of 121 English-literate patients with hallux valgus identified between October 2017 and May 2020 were analyzed. Reliability was assessed via Cronbach α. Construct validity was evaluated through 20 a priori hypotheses by correlating the AOFAS MTP-IP score for hallux and lesser toes with other patient-reported outcome measures (PROMs). Standardized response means (SRMs) were calculated to evaluate responsiveness at 6 months postoperative. Structural validity was evaluated via confirmatory factor analysis (CFA) whereby a good fit was indicated when comparative fit index (CFI) is >0.95, Tucker-Lewis index (TLI) is >0.95 and standardized root mean residual (SRMR) is <0.08.

RESULTS

The AOFAS MTP-IP score demonstrated reliability with a Cronbach α of 0.837. Convergent construct validity was confirmed when all a priori hypotheses were fulfilled. Structural validity was established with our AOFAS MTP-IP score model that displayed good fit for a 1-factor structure (CFI = 0.988, TLI = 0.960, SRMR = 0.034). Responsiveness of the AOFAS MTP-IP score for hallux was demonstrated by an SRM score of 1.28.

CONCLUSION

The AOFAS MTP-IP score displayed adequate reliability and validity among English-literate patients in Singapore with an operatively managed hallux valgus.

LEVEL OF EVIDENCE

Level III: Retrospective cohort study.

Reliability and Validity of the Turkish Version of the American Orthopaedic Foot and Ankle Society Hallux Metatarsophalangeal-Interphalangeal Joint Scale

BACKGROUND

The American Orthopaedic Foot and Ankle Society Hallux Metatarsophalangeal-Interphalangeal (AOFAS Hallux MTP-IP) scale is one of the most widely used outcome measures to evaluate hallux pathologies. This study aimed to translate the AOFAS Hallux MTP-IP scale into Turkish and investigate its psychometric properties.

METHODS

The psychometric properties of the Turkish version of the AOFAS Hallux MTP-IP (AOFAS Hallux MTP-IP-T) scale were tested in 66 patients with hallux pathologies (52 women; mean age, 47.64 ± 12.75 years). Cronbach's alpha was used to assess internal consistency. The intraclass correlation coefficient (ICC) was used to estimate test-retest. Construct validity was analyzed with the Turkish version of the Manchester-Oxford Foot Questionnaire (MOXFQ), Visual Analogue Scale (VAS), and 12-item Short-Form Health Survey(SF-12).

RESULTS

The AOFAS Hallux MTP-IP-T scale had adequate internal consistency (α = 0.71) and test-retest reliability (ICC2,1 = 0.93 for pain, ICC2,1 = 0.97 for function, and ICC2,1 = 0.97 for total score). The AOFAS Hallux MTP-IP-T total score has a moderate to strong correlation with VAS-activity and MOXFQ (ρ = -0.77, P = .001; ρ = -0.69, P = .001, respectively). The weakest correlation was found between the AOFAS Hallux MTP-IP-T and the SF-12 mental component scale (ρ = 0.31, P = .01).

CONCLUSION

AOFAS Hallux MTP-IP-T has sufficient reliability and validity to evaluate Turkish-speaking individuals with a variety of forefoot pathologies including the hallux.

LEVELS OF EVIDENCE

Level II.

Translation, Cultural Adaptation, and Validation of the American Orthopedic Foot and Ankle Society Scale in Patients With Hallux Valgus in Colombia

The American Orthopedic Foot and Ankle Society (AOFAS) scale for hallux metatarsophalangeal (MTP) and interphalangeal (IP) joints is used throughout the world for the clinical assessment of patients with hallux valgus, and it has 3 subscales: pain, function, and alignment. The objective of this prospective, observational study was to perform translation, cultural adaptation, and validation of this scale for Colombian Spanish. The Foot Function Index and Short Form-36 (SF-36) questionnaires were also used in the validation process. Patients who were 18 years or older, resided in the city of Bogota, were able to read and write in Spanish, and were within 4 years of corrective surgery for hallux valgus were included. A total of 79 patients were included in the study, 25 of whom were involved in the translation process and all of whom were involved in the validation process. Construct validity was demonstrated by significant positive Spearman's correlations between the AOFAS pain subscale and the AOFAS function subscale (r_s = 0.483), total AOFAS scale (r_s = 0.795), and SF-36 physical summary subscale (r_s = 0.364); and between the AOFAS function subscale and the total AOFAS scale (r_s = 0.894) and SF-36 physical summary subscale (r_s = 0.310). The test-retest process for reliability yielded intraclass correlation coefficients between the AOFAS pain, function, and alignment subscales that were all 0.70 or higher. The AOFAS scale for hallux MTP and IP joints was successfully translated and adapted into Colombian Spanish, and this version demonstrated construct validity and reliability, rendering it suitable for clinical use in Colombian patients with hallux valgus.

Clinical and radiological outcomes after arthrodesis of the first metatarsophalangeal joint

PURPOSE

The main aim of this study was to investigate the correlation between radiographic findings and clinical outcomes following the first metatarsophalangeal (MTP) joint arthrodesis.

METHODS

In a comparative retrospective study, on 46 patients (48 ft), the correlation between post-operative radiographic findings including hallux valgus angle (HVA) and first MTP dorsiflexion angle (MTPDA) and clinical outcomes including VAS pain, modified AOFAS hallux score, and FFI questionnaire were evaluated. Moreover, clinical outcomes were compared between cases with pre-operative diagnosis of first MTP inflammatory arthritis, hallux valgus, hallux varus, and grade 3 and 4 of hallux rigidus. The effect of first MTP arthrodesis on Meary's angle and intermetatarsal angle (IMA) were found out.

RESULTS

The mean age of the patients was 56.3 ± 9.1 (range, 29-69) years, including 42 (91.3%) females and 4 (8.7%) males. We had fusion rate of 97.9%, one asymptomatic nonunion case (2.1%). Totally, mean scores of modified AOFAS hallux score, FFI percentage, and VAS pain were 88.9 ± 12.6, 9.4 ± 16.5, and 1.23 ± 2.24, respectively. Hallux varus was associated with the most favourable outcomes; whereas, patients with first MTP arthritis got the worst outcome. Regression analysis test between clinical outcomes and HVA > 15° and first MTPDA >15° showed correlation coefficient of almost zero. No statistically significant differences were found between the clinical outcomes of grade 3 and 4 of hallux rigidus (p value of modified AOFAS hallux score, FFI percentage, and VAS pain: 0.879, 0.906, and 0.298, respectively). Mean of HVA and IMA reduction in 15 hallux valgus underwent first MTP fusion were 34.4° and 8.4°, respectively. Meary's angle increased about 4° with statistically significant difference (p value 0.001).

CONCLUSION

Patients with first MTP fusion > 15° in coronal and transverse plans could have acceptable clinical outcomes. The clinical outcome of first MTP arthrodesis for grade 3 hallux rigidus is comparable with grade 4. First MTP fusion would have positive effect on IMA and Meary's angle.