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Mohammad R Pourahmadi - One of the best experts on this subject based on the ideXlab platform.
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the reliability and concurrent validity of a new Iphone Application for measuring active lumbar spine flexion and extension range of motion in patients with low back pain
Physiotherapy Theory and Practice, 2021Co-Authors: Mohammad R Pourahmadi, Elnaz Momeni, Negar Mohseni, Hamid Hesarikia, Ali Ghanjal, Alireza ShamsoddiniAbstract:Objective: To investigate the reliability and validity of an Iphone® Application (iHandy® Level) for measuring active lumbar flexion-extension range of motion (ROM) in chronic nonspecific low back pain (CNLBP) patients. Methods: Fifteen CNLBP patients were recruited. The participants stood in a relaxed position and the T12-L1 and S1-S2 spinal levels were identified through palpation and were marked on the skin. Two blinded examiners used a gravity-based inclinometer and the Application in order to measure ROM. The instruments were lined up appropriately and the participants were asked to perform maximum lumbar flexion following by maximum extension. First, each examiner placed the instruments over the T12-L1 level and then over the S1-S2 level during the movements. In order to calculate flexion-extension ROM, the measurement which was obtained from T12-L1 was subtracted from S1-S2. Intraclass correlation coefficient (ICC) models (3, k) and (2, k) were used in order to determine the intrarater and inter-rater reliability, respectively. The Spearman's correlation coefficients (rs ) and Bland-Altman plots were used in order to examine the validity. Results: Fair-to-excellent intrarater (ICC = 0.39-0.89) and moderate-to-good inter-rater reliability (ICC = 0.55-0.77) were observed using the inclinometer. Moreover, poor-to-good intrarater (ICC = 0.30-70) and inter-rater (ICC = 0.13-0.70) reliability were found with the Application. The Spearman's correlation coefficients demonstrated low-to-moderate associations between the measures of the two instruments (rs ≥ 0.22). The Bland-Altman plots indicated that there was a significant difference between the instruments for measuring flexion ROM. The difference was not significant for measuring extension ROM. Conclusion: The iHandy® Level Application does not have sufficient validity for measuring active lumbar flexion ROM in CNLBP patients.
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a new Iphone Application for the measurement of active craniocervical range of motion in patients with nonspecific neck pain a reliability and validity study
Annals of Physical and Rehabilitation Medicine, 2018Co-Authors: Mohammad R Pourahmadi, Rasool Bagheri, Morteza Taghipour, Ebrahimi I TakamjaniAbstract:Introduction/Background Measurement of cervical spine range of motion (ROM) is often considered to be an essential component of cervical spine physiotherapy assessment. This study aimed to investigate the reliability and validity of an Iphone Application (app) (Goniometer Pro) for measuring active craniocervical ROM (ACCROM) in patients with nonspecific neck pain. Material and method A cross-sectional study was conducted at the musculoskeletal biomechanics laboratory located at Iran University of Medical Sciences. Forty nonspecific neck pain patients participated in this study. The outcome measure was the ACCROM, including flexion, extension, lateral flexion, and rotation. Following the recruitment process, ACCROM was measured using a universal goniometer (UG) and Iphone 7 app. Two blinded examiners each used the UG and Iphone to measure ACCROM in the following sequences: flexion, extension, lateral flexion, and rotation. The second (2 hours later) and third (48 hours later) sessions were carried out in the same manner as the first session. Intraclass correlation coefficient (ICC) models were used to determine the intra-rater and inter-rater reliability. The Pearson correlation coefficients were used to establish concurrent validity of the Iphone app. Minimum detectable change at the 95% confidence level (MDC95) was also computed. Results Good intra-rater and inter-rater reliability was demonstrated for the goniometer with ICC values of ≥ 0.66 and ≥ 0.70 and the Iphone app with ICC values of ≥ 0.62 and ≥ 0.65, respectively. The MDC95 ranged from 2.21° to 12.50° for the intra-rater analysis and from 3.40° to 12.61° for the inter-rater analysis. The concurrent validity between the two instruments was high, with r values of ≥ 0.63. The magnitude of the differences between the UG and Iphone app values (effect sizes) was small, with Cohen d values of ≤ 0.17. Conclusion The Iphone app possesses good reliability and high validity. It seems that this app can be used for measuring ACCROM.
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a new Iphone Application for measuring active craniocervical range of motion in patients with non specific neck pain a reliability and validity study
The Spine Journal, 2017Co-Authors: Mohammad R Pourahmadi, Rasool Bagheri, Morteza Taghipour, Ismail Ebrahimi Takamjani, Javad Sarrafzadeh, Mohammad Ali MohsenibandpeiAbstract:Abstract Background Context Measurement of cervical spine range of motion (ROM) is often considered to be an essential component of cervical spine physiotherapy assessment. Purpose This study aimed to investigate the reliability and validity of an Iphone Application (app) (Goniometer Pro) for measuring active craniocervical ROM (ACCROM) in patients with non-specific neck pain. Study Design/Setting A cross-sectional study was conducted at the musculoskeletal biomechanics laboratory located at Iran University of Medical Sciences. Patient Sample Forty non-specific neck pain patients participated in this study. Outcome Measures The outcome measure was the ACCROM, including flexion, extension, lateral flexion, and rotation. Method Following the recruitment process, ACCROM was measured using a universal goniometer (UG) and Iphone 7 app. Two blinded examiners each used the UG and Iphone to measure ACCROM in the following sequences: flexion, extension, lateral flexion, and rotation. The second (2 hours later) and third (48 hours later) sessions were carried out in the same manner as the first session. Intraclass correlation coefficient (ICC) models were used to determine the intra-rater and inter-rater reliability. The Pearson correlation coefficients were used to establish concurrent validity of the Iphone app. Minimum detectable change at the 95% confidence level (MDC95) was also computed. Results Good intra-rater and inter-rater reliability was demonstrated for the goniometer with ICC values of ≥0.66 and ≥0.70 and the Iphone app with ICC values of ≥0.62 and ≥0.65, respectively. The MDC95 ranged from 2.21° to 12.50° for the intra-rater analysis and from 3.40° to 12.61° for the inter-rater analysis. The concurrent validity between the two instruments was high, with r valuesof ≥0.63. The magnitude of the differences between the UG and Iphone app values (effect sizes) was small, with Cohen d values of ≤0.17. Conclusions The Iphone app possesses good reliability and high validity. It seems that this app can be used for measuring ACCROM.
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reliability and validity of an Iphone Application for the measurement of lumbar spine flexion and extension range of motion
PeerJ, 2016Co-Authors: Mohammad R Pourahmadi, Morteza Taghipour, Ismail Ebrahimi Takamjani, Mohammad Ali Mohsenibandpei, Elham Jannati, Fatemeh RajabzadehAbstract:Background Measurement of lumbar spine range of motion (ROM) is often considered to be an essential component of lumbar spine physiotherapy and orthopedic assessment. The measurement can be carried out through various instruments such as inclinometers, goniometers, and etc. Recent smartphones have been equipped with accelerometers and magnetometers, which, through specific software Applications (apps) can be used for inclinometric functions. Purpose The main purpose was to investigate the reliability and validity of an Iphone(®) app (TiltMeter(©) -advanced level and inclinometer) for measuring standing lumbar spine flexion-extension ROM in asymptomatic subjects. Design A cross-sectional study was carried out. Setting This study was conducted in a physiotherapy clinic located at School of Rehabilitation Sciences, Iran University of Medical Science and Health Services, Tehran, Iran. Subjects A convenience sample of 30 asymptomatic adults (15 males; 15 females; age range = 18-55 years) was recruited between August 2015 and December 2015. Methods Following a 2-minute warm-up, the subjects were asked to stand in a relaxed position and their skin was marked at the T12-L1 and S1-S2 spinal levels. From this position, they were asked to perform maximum lumbar flexion followed by maximum lumbar extension with their knees straight. Two blinded raters each used an inclinometer and the Iphone (®) app to measure lumbar spine flexion-extension ROM. A third rater read the measured angles. To calculate total lumbar spine flexion-extension ROM, the measurement from S1-S2 was subtracted from T12-L1. The second (2 hours later) and third (48 hours later) sessions were carried out in the same manner as the first session. All of the measurements were conducted 3 times and the mean value of 3 repetitions for each measurement was used for analysis. Intraclass correlation coefficient (ICC) models (3, k) and (2, k) were used to determine the intra-rater and inter-rater reliability, respectively. The Pearson correlation coefficients were used to establish concurrent validity of the Iphone(®) app. Furthermore, minimum detectable change at the 95% confidence level (MDC95) was computed as 1.96 × standard error of measurement × [Formula: see text]. Results Good to excellent intra-rater and inter-rater reliability were demonstrated for both the gravity-based inclinometer with ICC values of ≥0.84 and ≥0.77 and the Iphone(®) app with ICC values of ≥0.85 and ≥0.85, respectively. The MDC95 ranged from 5.82°to 8.18°for the intra-rater analysis and from 7.38°to 8.66° for the inter-rater analysis. The concurrent validity for flexion and extension between the 2 instruments was 0.85 and 0.91, respectively. Conclusions The Iphone(®)app possesses good to excellent intra-rater and inter-rater reliability and concurrent validity. It seems that the Iphone(®) app can be used for the measurement of lumbar spine flexion-extension ROM. Level of evidence IIb.
Mohammad Ali Mohsenibandpei - One of the best experts on this subject based on the ideXlab platform.
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a new Iphone Application for measuring active craniocervical range of motion in patients with non specific neck pain a reliability and validity study
The Spine Journal, 2017Co-Authors: Mohammad R Pourahmadi, Rasool Bagheri, Morteza Taghipour, Ismail Ebrahimi Takamjani, Javad Sarrafzadeh, Mohammad Ali MohsenibandpeiAbstract:Abstract Background Context Measurement of cervical spine range of motion (ROM) is often considered to be an essential component of cervical spine physiotherapy assessment. Purpose This study aimed to investigate the reliability and validity of an Iphone Application (app) (Goniometer Pro) for measuring active craniocervical ROM (ACCROM) in patients with non-specific neck pain. Study Design/Setting A cross-sectional study was conducted at the musculoskeletal biomechanics laboratory located at Iran University of Medical Sciences. Patient Sample Forty non-specific neck pain patients participated in this study. Outcome Measures The outcome measure was the ACCROM, including flexion, extension, lateral flexion, and rotation. Method Following the recruitment process, ACCROM was measured using a universal goniometer (UG) and Iphone 7 app. Two blinded examiners each used the UG and Iphone to measure ACCROM in the following sequences: flexion, extension, lateral flexion, and rotation. The second (2 hours later) and third (48 hours later) sessions were carried out in the same manner as the first session. Intraclass correlation coefficient (ICC) models were used to determine the intra-rater and inter-rater reliability. The Pearson correlation coefficients were used to establish concurrent validity of the Iphone app. Minimum detectable change at the 95% confidence level (MDC95) was also computed. Results Good intra-rater and inter-rater reliability was demonstrated for the goniometer with ICC values of ≥0.66 and ≥0.70 and the Iphone app with ICC values of ≥0.62 and ≥0.65, respectively. The MDC95 ranged from 2.21° to 12.50° for the intra-rater analysis and from 3.40° to 12.61° for the inter-rater analysis. The concurrent validity between the two instruments was high, with r valuesof ≥0.63. The magnitude of the differences between the UG and Iphone app values (effect sizes) was small, with Cohen d values of ≤0.17. Conclusions The Iphone app possesses good reliability and high validity. It seems that this app can be used for measuring ACCROM.
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reliability and validity of an Iphone Application for the measurement of lumbar spine flexion and extension range of motion
PeerJ, 2016Co-Authors: Mohammad R Pourahmadi, Morteza Taghipour, Ismail Ebrahimi Takamjani, Mohammad Ali Mohsenibandpei, Elham Jannati, Fatemeh RajabzadehAbstract:Background Measurement of lumbar spine range of motion (ROM) is often considered to be an essential component of lumbar spine physiotherapy and orthopedic assessment. The measurement can be carried out through various instruments such as inclinometers, goniometers, and etc. Recent smartphones have been equipped with accelerometers and magnetometers, which, through specific software Applications (apps) can be used for inclinometric functions. Purpose The main purpose was to investigate the reliability and validity of an Iphone(®) app (TiltMeter(©) -advanced level and inclinometer) for measuring standing lumbar spine flexion-extension ROM in asymptomatic subjects. Design A cross-sectional study was carried out. Setting This study was conducted in a physiotherapy clinic located at School of Rehabilitation Sciences, Iran University of Medical Science and Health Services, Tehran, Iran. Subjects A convenience sample of 30 asymptomatic adults (15 males; 15 females; age range = 18-55 years) was recruited between August 2015 and December 2015. Methods Following a 2-minute warm-up, the subjects were asked to stand in a relaxed position and their skin was marked at the T12-L1 and S1-S2 spinal levels. From this position, they were asked to perform maximum lumbar flexion followed by maximum lumbar extension with their knees straight. Two blinded raters each used an inclinometer and the Iphone (®) app to measure lumbar spine flexion-extension ROM. A third rater read the measured angles. To calculate total lumbar spine flexion-extension ROM, the measurement from S1-S2 was subtracted from T12-L1. The second (2 hours later) and third (48 hours later) sessions were carried out in the same manner as the first session. All of the measurements were conducted 3 times and the mean value of 3 repetitions for each measurement was used for analysis. Intraclass correlation coefficient (ICC) models (3, k) and (2, k) were used to determine the intra-rater and inter-rater reliability, respectively. The Pearson correlation coefficients were used to establish concurrent validity of the Iphone(®) app. Furthermore, minimum detectable change at the 95% confidence level (MDC95) was computed as 1.96 × standard error of measurement × [Formula: see text]. Results Good to excellent intra-rater and inter-rater reliability were demonstrated for both the gravity-based inclinometer with ICC values of ≥0.84 and ≥0.77 and the Iphone(®) app with ICC values of ≥0.85 and ≥0.85, respectively. The MDC95 ranged from 5.82°to 8.18°for the intra-rater analysis and from 7.38°to 8.66° for the inter-rater analysis. The concurrent validity for flexion and extension between the 2 instruments was 0.85 and 0.91, respectively. Conclusions The Iphone(®)app possesses good to excellent intra-rater and inter-rater reliability and concurrent validity. It seems that the Iphone(®) app can be used for the measurement of lumbar spine flexion-extension ROM. Level of evidence IIb.
Morteza Taghipour - One of the best experts on this subject based on the ideXlab platform.
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a new Iphone Application for the measurement of active craniocervical range of motion in patients with nonspecific neck pain a reliability and validity study
Annals of Physical and Rehabilitation Medicine, 2018Co-Authors: Mohammad R Pourahmadi, Rasool Bagheri, Morteza Taghipour, Ebrahimi I TakamjaniAbstract:Introduction/Background Measurement of cervical spine range of motion (ROM) is often considered to be an essential component of cervical spine physiotherapy assessment. This study aimed to investigate the reliability and validity of an Iphone Application (app) (Goniometer Pro) for measuring active craniocervical ROM (ACCROM) in patients with nonspecific neck pain. Material and method A cross-sectional study was conducted at the musculoskeletal biomechanics laboratory located at Iran University of Medical Sciences. Forty nonspecific neck pain patients participated in this study. The outcome measure was the ACCROM, including flexion, extension, lateral flexion, and rotation. Following the recruitment process, ACCROM was measured using a universal goniometer (UG) and Iphone 7 app. Two blinded examiners each used the UG and Iphone to measure ACCROM in the following sequences: flexion, extension, lateral flexion, and rotation. The second (2 hours later) and third (48 hours later) sessions were carried out in the same manner as the first session. Intraclass correlation coefficient (ICC) models were used to determine the intra-rater and inter-rater reliability. The Pearson correlation coefficients were used to establish concurrent validity of the Iphone app. Minimum detectable change at the 95% confidence level (MDC95) was also computed. Results Good intra-rater and inter-rater reliability was demonstrated for the goniometer with ICC values of ≥ 0.66 and ≥ 0.70 and the Iphone app with ICC values of ≥ 0.62 and ≥ 0.65, respectively. The MDC95 ranged from 2.21° to 12.50° for the intra-rater analysis and from 3.40° to 12.61° for the inter-rater analysis. The concurrent validity between the two instruments was high, with r values of ≥ 0.63. The magnitude of the differences between the UG and Iphone app values (effect sizes) was small, with Cohen d values of ≤ 0.17. Conclusion The Iphone app possesses good reliability and high validity. It seems that this app can be used for measuring ACCROM.
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a new Iphone Application for measuring active craniocervical range of motion in patients with non specific neck pain a reliability and validity study
The Spine Journal, 2017Co-Authors: Mohammad R Pourahmadi, Rasool Bagheri, Morteza Taghipour, Ismail Ebrahimi Takamjani, Javad Sarrafzadeh, Mohammad Ali MohsenibandpeiAbstract:Abstract Background Context Measurement of cervical spine range of motion (ROM) is often considered to be an essential component of cervical spine physiotherapy assessment. Purpose This study aimed to investigate the reliability and validity of an Iphone Application (app) (Goniometer Pro) for measuring active craniocervical ROM (ACCROM) in patients with non-specific neck pain. Study Design/Setting A cross-sectional study was conducted at the musculoskeletal biomechanics laboratory located at Iran University of Medical Sciences. Patient Sample Forty non-specific neck pain patients participated in this study. Outcome Measures The outcome measure was the ACCROM, including flexion, extension, lateral flexion, and rotation. Method Following the recruitment process, ACCROM was measured using a universal goniometer (UG) and Iphone 7 app. Two blinded examiners each used the UG and Iphone to measure ACCROM in the following sequences: flexion, extension, lateral flexion, and rotation. The second (2 hours later) and third (48 hours later) sessions were carried out in the same manner as the first session. Intraclass correlation coefficient (ICC) models were used to determine the intra-rater and inter-rater reliability. The Pearson correlation coefficients were used to establish concurrent validity of the Iphone app. Minimum detectable change at the 95% confidence level (MDC95) was also computed. Results Good intra-rater and inter-rater reliability was demonstrated for the goniometer with ICC values of ≥0.66 and ≥0.70 and the Iphone app with ICC values of ≥0.62 and ≥0.65, respectively. The MDC95 ranged from 2.21° to 12.50° for the intra-rater analysis and from 3.40° to 12.61° for the inter-rater analysis. The concurrent validity between the two instruments was high, with r valuesof ≥0.63. The magnitude of the differences between the UG and Iphone app values (effect sizes) was small, with Cohen d values of ≤0.17. Conclusions The Iphone app possesses good reliability and high validity. It seems that this app can be used for measuring ACCROM.
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reliability and validity of an Iphone Application for the measurement of lumbar spine flexion and extension range of motion
PeerJ, 2016Co-Authors: Mohammad R Pourahmadi, Morteza Taghipour, Ismail Ebrahimi Takamjani, Mohammad Ali Mohsenibandpei, Elham Jannati, Fatemeh RajabzadehAbstract:Background Measurement of lumbar spine range of motion (ROM) is often considered to be an essential component of lumbar spine physiotherapy and orthopedic assessment. The measurement can be carried out through various instruments such as inclinometers, goniometers, and etc. Recent smartphones have been equipped with accelerometers and magnetometers, which, through specific software Applications (apps) can be used for inclinometric functions. Purpose The main purpose was to investigate the reliability and validity of an Iphone(®) app (TiltMeter(©) -advanced level and inclinometer) for measuring standing lumbar spine flexion-extension ROM in asymptomatic subjects. Design A cross-sectional study was carried out. Setting This study was conducted in a physiotherapy clinic located at School of Rehabilitation Sciences, Iran University of Medical Science and Health Services, Tehran, Iran. Subjects A convenience sample of 30 asymptomatic adults (15 males; 15 females; age range = 18-55 years) was recruited between August 2015 and December 2015. Methods Following a 2-minute warm-up, the subjects were asked to stand in a relaxed position and their skin was marked at the T12-L1 and S1-S2 spinal levels. From this position, they were asked to perform maximum lumbar flexion followed by maximum lumbar extension with their knees straight. Two blinded raters each used an inclinometer and the Iphone (®) app to measure lumbar spine flexion-extension ROM. A third rater read the measured angles. To calculate total lumbar spine flexion-extension ROM, the measurement from S1-S2 was subtracted from T12-L1. The second (2 hours later) and third (48 hours later) sessions were carried out in the same manner as the first session. All of the measurements were conducted 3 times and the mean value of 3 repetitions for each measurement was used for analysis. Intraclass correlation coefficient (ICC) models (3, k) and (2, k) were used to determine the intra-rater and inter-rater reliability, respectively. The Pearson correlation coefficients were used to establish concurrent validity of the Iphone(®) app. Furthermore, minimum detectable change at the 95% confidence level (MDC95) was computed as 1.96 × standard error of measurement × [Formula: see text]. Results Good to excellent intra-rater and inter-rater reliability were demonstrated for both the gravity-based inclinometer with ICC values of ≥0.84 and ≥0.77 and the Iphone(®) app with ICC values of ≥0.85 and ≥0.85, respectively. The MDC95 ranged from 5.82°to 8.18°for the intra-rater analysis and from 7.38°to 8.66° for the inter-rater analysis. The concurrent validity for flexion and extension between the 2 instruments was 0.85 and 0.91, respectively. Conclusions The Iphone(®)app possesses good to excellent intra-rater and inter-rater reliability and concurrent validity. It seems that the Iphone(®) app can be used for the measurement of lumbar spine flexion-extension ROM. Level of evidence IIb.
Michele Mason - One of the best experts on this subject based on the ideXlab platform.
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american board of family medicine abfm launches new exam prep Iphone Application
Journal of the American Board of Family Medicine, 2011Co-Authors: Michele MasonAbstract:The American Board of Family Medicine (ABFM) is pleased to announce the launch of its new Iphone Application: ABFM Examination Prep. This mobile Application provides family physicians with useful information that will assist with preparation for the ABFM Maintenance of Certification Examination.
Ismail Ebrahimi Takamjani - One of the best experts on this subject based on the ideXlab platform.
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a new Iphone Application for measuring active craniocervical range of motion in patients with non specific neck pain a reliability and validity study
The Spine Journal, 2017Co-Authors: Mohammad R Pourahmadi, Rasool Bagheri, Morteza Taghipour, Ismail Ebrahimi Takamjani, Javad Sarrafzadeh, Mohammad Ali MohsenibandpeiAbstract:Abstract Background Context Measurement of cervical spine range of motion (ROM) is often considered to be an essential component of cervical spine physiotherapy assessment. Purpose This study aimed to investigate the reliability and validity of an Iphone Application (app) (Goniometer Pro) for measuring active craniocervical ROM (ACCROM) in patients with non-specific neck pain. Study Design/Setting A cross-sectional study was conducted at the musculoskeletal biomechanics laboratory located at Iran University of Medical Sciences. Patient Sample Forty non-specific neck pain patients participated in this study. Outcome Measures The outcome measure was the ACCROM, including flexion, extension, lateral flexion, and rotation. Method Following the recruitment process, ACCROM was measured using a universal goniometer (UG) and Iphone 7 app. Two blinded examiners each used the UG and Iphone to measure ACCROM in the following sequences: flexion, extension, lateral flexion, and rotation. The second (2 hours later) and third (48 hours later) sessions were carried out in the same manner as the first session. Intraclass correlation coefficient (ICC) models were used to determine the intra-rater and inter-rater reliability. The Pearson correlation coefficients were used to establish concurrent validity of the Iphone app. Minimum detectable change at the 95% confidence level (MDC95) was also computed. Results Good intra-rater and inter-rater reliability was demonstrated for the goniometer with ICC values of ≥0.66 and ≥0.70 and the Iphone app with ICC values of ≥0.62 and ≥0.65, respectively. The MDC95 ranged from 2.21° to 12.50° for the intra-rater analysis and from 3.40° to 12.61° for the inter-rater analysis. The concurrent validity between the two instruments was high, with r valuesof ≥0.63. The magnitude of the differences between the UG and Iphone app values (effect sizes) was small, with Cohen d values of ≤0.17. Conclusions The Iphone app possesses good reliability and high validity. It seems that this app can be used for measuring ACCROM.
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reliability and validity of an Iphone Application for the measurement of lumbar spine flexion and extension range of motion
PeerJ, 2016Co-Authors: Mohammad R Pourahmadi, Morteza Taghipour, Ismail Ebrahimi Takamjani, Mohammad Ali Mohsenibandpei, Elham Jannati, Fatemeh RajabzadehAbstract:Background Measurement of lumbar spine range of motion (ROM) is often considered to be an essential component of lumbar spine physiotherapy and orthopedic assessment. The measurement can be carried out through various instruments such as inclinometers, goniometers, and etc. Recent smartphones have been equipped with accelerometers and magnetometers, which, through specific software Applications (apps) can be used for inclinometric functions. Purpose The main purpose was to investigate the reliability and validity of an Iphone(®) app (TiltMeter(©) -advanced level and inclinometer) for measuring standing lumbar spine flexion-extension ROM in asymptomatic subjects. Design A cross-sectional study was carried out. Setting This study was conducted in a physiotherapy clinic located at School of Rehabilitation Sciences, Iran University of Medical Science and Health Services, Tehran, Iran. Subjects A convenience sample of 30 asymptomatic adults (15 males; 15 females; age range = 18-55 years) was recruited between August 2015 and December 2015. Methods Following a 2-minute warm-up, the subjects were asked to stand in a relaxed position and their skin was marked at the T12-L1 and S1-S2 spinal levels. From this position, they were asked to perform maximum lumbar flexion followed by maximum lumbar extension with their knees straight. Two blinded raters each used an inclinometer and the Iphone (®) app to measure lumbar spine flexion-extension ROM. A third rater read the measured angles. To calculate total lumbar spine flexion-extension ROM, the measurement from S1-S2 was subtracted from T12-L1. The second (2 hours later) and third (48 hours later) sessions were carried out in the same manner as the first session. All of the measurements were conducted 3 times and the mean value of 3 repetitions for each measurement was used for analysis. Intraclass correlation coefficient (ICC) models (3, k) and (2, k) were used to determine the intra-rater and inter-rater reliability, respectively. The Pearson correlation coefficients were used to establish concurrent validity of the Iphone(®) app. Furthermore, minimum detectable change at the 95% confidence level (MDC95) was computed as 1.96 × standard error of measurement × [Formula: see text]. Results Good to excellent intra-rater and inter-rater reliability were demonstrated for both the gravity-based inclinometer with ICC values of ≥0.84 and ≥0.77 and the Iphone(®) app with ICC values of ≥0.85 and ≥0.85, respectively. The MDC95 ranged from 5.82°to 8.18°for the intra-rater analysis and from 7.38°to 8.66° for the inter-rater analysis. The concurrent validity for flexion and extension between the 2 instruments was 0.85 and 0.91, respectively. Conclusions The Iphone(®)app possesses good to excellent intra-rater and inter-rater reliability and concurrent validity. It seems that the Iphone(®) app can be used for the measurement of lumbar spine flexion-extension ROM. Level of evidence IIb.