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Taniguchi S, Matsuura Y, Takehara T, Yamada A, Shiko Y, Nakagawa K, Ohtori S. Thumb Pronation Angle in Thumb Opposition Evaluated by the Nail Tip Angle of Thumb-Ring Finger Opposition. Hand (N Y) 2024:15589447241236249. [PMID: 38491921 DOI: 10.1177/15589447241236249] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 03/18/2024]
Abstract
BACKGROUND This study aimed to devise the method for the evaluation of the thumb pronation angle and calculate its reference value. METHODS 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. RESULTS 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. CONCLUSIONS The T-R angle was a suitable evaluation method for the thumb pronation angle, and it should be evaluated by age groups.
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Affiliation(s)
- Shinji Taniguchi
- Department of Orthopaedic Surgery, Graduate School of Medicine, Chiba University, Japan
- Department of Orthopaedic Surgery, Toho University School of Medicine, Sakura, Japan
| | - Yusuke Matsuura
- Department of Orthopaedic Surgery, Graduate School of Medicine, Chiba University, Japan
| | | | - Ayae Yamada
- Department of Rehabilitation, Chiba University Hospital, Japan
| | - Yuki Shiko
- Clinical Research Center, Graduate School of Medicine, Chiba University, Japan
| | - Koichi Nakagawa
- Department of Orthopaedic Surgery, Toho University School of Medicine, Sakura, Japan
| | - Seiji Ohtori
- Department of Orthopaedic Surgery, Graduate School of Medicine, Chiba University, Japan
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Kimura H, Furuhata R, Matsuo T, Suzuki T, Matsumura N, Sato K, Iwamoto T. Point of care ultrasound combined with CTS-6 to diagnose idiopathic carpal tunnel syndrome. J Orthop Sci 2024:S0949-2658(24)00008-3. [PMID: 38302310 DOI: 10.1016/j.jos.2024.01.007] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 11/02/2023] [Revised: 01/10/2024] [Accepted: 01/23/2024] [Indexed: 02/03/2024]
Abstract
BACKGROUND This study aimed to demonstrate the effectiveness of our new diagnostic chart using point of care ultrasound combined with CTS-6 for diagnosing idiopathic carpal tunnel syndrome. METHODS We conducted a retrospective analysis of the data of patients who visited our department and received point of care ultrasound combined with CTS-6 from 2020 to 2023. Data regarding age, sex, initial and final diagnosis, cross-sectional area of the median nerve, CTS-6 score, and electrodiagnostic severity were obtained and statistically analyzed. RESULTS Of the 177 wrists included in our study, 138 (78 %) were diagnosed with carpal tunnel syndrome, while 39 (22 %) were not (non-carpal tunnel syndrome). With our diagnostic method, 127 wrists (72 %) were diagnosed initially with carpal tunnel syndrome, 23 wrists (13 %) with non-carpal tunnel syndrome, and the rest 27 wrists (15 %) as borderline. Our initial diagnoses of carpal tunnel syndrome and non-carpal tunnel syndrome were maintained in all cases except for two. Cross-sectional area, CTS-6 score, and electrodiagnostic severity showed a positive correlation. A post hoc analysis showed that the new scoring system (CTS-6 score + 2 × cross-sectional area) with a cutoff value of 31.25 points showed a sensitivity as high as 95 % and a specificity of 100 %. CONCLUSIONS Our findings suggest that most suspected idiopathic carpal tunnel syndrome cases can be diagnosed correctly using the diagnostic chart. Although additional tools, including electrodiagnostic studies, may be needed for borderline cases, the use of point of care ultrasound combined with CTS-6 may be a recommendable first-line confirmatory test because point of care ultrasound and CTS-6 could be complementary tools, and this chart may be especially beneficial for atypical or outlier cases. LEVEL OF EVIDENCE Diagnostic III.
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Affiliation(s)
- Hiroo Kimura
- Department of Orthopaedic Surgery, Keio University School of Medicine, Tokyo, Japan; Department of Orthopaedic Surgery, Kitasato Institute Hospital, Tokyo, Japan.
| | - Ryogo Furuhata
- Department of Orthopaedic Surgery, Keio University School of Medicine, Tokyo, Japan.
| | - Tomoki Matsuo
- Department of Orthopaedic Surgery, Keio University School of Medicine, Tokyo, Japan.
| | - Taku Suzuki
- Department of Orthopaedic Surgery, Keio University School of Medicine, Tokyo, Japan.
| | - Noboru Matsumura
- Department of Orthopaedic Surgery, Keio University School of Medicine, Tokyo, Japan.
| | - Kazuki Sato
- Institute for Integrated Sports Medicine, Keio University School of Medicine, Tokyo, Japan.
| | - Takuji Iwamoto
- Department of Orthopaedic Surgery, Keio University School of Medicine, Tokyo, Japan.
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Iida N, Kuroiwa T, Amadio P. Analysis of the thenar muscles with ultrasound shear wave elastography: Reliability and preliminary findings. Muscle Nerve 2024; 69:72-77. [PMID: 37964671 DOI: 10.1002/mus.28004] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/13/2023] [Revised: 11/01/2023] [Accepted: 11/03/2023] [Indexed: 11/16/2023]
Abstract
INTRODUCTION/AIMS Ultrasound shear wave elastography (SWE) of the thenar muscles has the potential to provide a simple and noninvasive assessment of the severity of carpal tunnel syndrome (CTS), but its reliability is unknown. The purpose of this study was to assess the intra- and inter-rater reliability of SWE measurements of the elastic modulus of individual thenar muscles, to assess their suitability for clinical application. METHODS Fourteen healthy volunteers, seven male and seven female, participated in this study. The elastic modulus of the thenar muscles was measured with SWE, with two independent examiners to assess inter-rater reliability. The first examiner also performed a second measurement after an interval of least 1 day to assess intra-rater reliability. Reliability was evaluated using an intraclass correlation coefficient (ICC) and 95% confidence interval (CI). RESULTS For the abductor pollicis brevis (APB) and opponens pollicis (OPP), the CI of ICC in intra-rater reliability was 0.47-0.85 and 0.56-0.88, respectively. The CI of ICC in inter-rater reliability was 0.27-0.78 for the APB and 0.22-0.76 for the OPP. The ICCs of intra- and/or inter-rater reliability of other thenar muscles were less than 0.5. DISCUSSION In this study, SWE evaluations of thenar muscles were quite variable in terms of their reliability. A larger study will be needed to determine the source of this variability, improve reliability, and assess the value of SWE in the evaluation of the severity of CTS.
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Affiliation(s)
- Naoya Iida
- Department of Orthopedic Surgery, Mayo Clinic, Rochester, Minnesota, USA
| | - Tomoyuki Kuroiwa
- Department of Orthopedic Surgery, Mayo Clinic, Rochester, Minnesota, USA
| | - Peter Amadio
- Department of Orthopedic Surgery, Mayo Clinic, Rochester, Minnesota, USA
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Shin KJ, Yi J, Hahn S. Shear-wave elastography evaluation of thenar muscle in carpal tunnel syndrome. JOURNAL OF CLINICAL ULTRASOUND : JCU 2023; 51:510-517. [PMID: 36201602 DOI: 10.1002/jcu.23359] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/25/2022] [Revised: 09/21/2022] [Accepted: 09/23/2022] [Indexed: 06/16/2023]
Abstract
PURPOSE We aim to evaluate the shear wave velocity (SWV) of the thenar muscle as an adjunct diagnostic tool for carpal tunnel syndrome (CTS). METHODS Ninety-two wrists with CTS and 30 control wrists without CTS underwent ultrasonographic evaluation of thenar muscle and median nerve including shear-wave elastography. Cross sectional area (CSA) of medial nerve and SWV of thenar muscle and median nerve were evaluated. CTS patients were assessed for Boston CTS, Padua CTS, modified Hirani grading scores, and nerve conduction study (NCS). SWVs, CSA, and NCS parameters were compared between two groups. RESULTS The SWVs of thenar muscle and median nerve (p < 0.001, respectively), and CSA of median nerve (p < 0.001) were more significantly greater in patients with CTS than in controls. The SWV of median nerve was moderately correlated with CSA of median nerve (r = 0.35, p < 0.001) and modified Hirani CTS score (r = 0.35, p < 0.001). The SWV of thenar muscle was inversely correlated with modified Hirani CTS score (r = -0.21, p = 0.04). CONCLUSION The SWV of thenar muscle and median nerve of CTS were significantly increased compared to that of control, and significantly negatively correlated with NCS parameters (modified Hirani CTS score). SWVs may be used as an adjunct diagnostic tool for CTS.
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Affiliation(s)
- Kyong Jin Shin
- Department of Neurology, Haeundae-Paik Hospital, Inje University College of Medicine, Busan, South Korea
| | - Jisook Yi
- Department of Radiology, Haeundae-Paik Hospital, Inje University College of Medicine, Busan, South Korea
| | - Seok Hahn
- Department of Radiology, Haeundae-Paik Hospital, Inje University College of Medicine, Busan, South Korea
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Kurumadani H, Kurauchi K, Date S, Ishii Y, Sunagawa T. Effect of the position of the interphalangeal joint on movements of the trapeziometacarpal joint during thumb opposition. J Hand Surg Eur Vol 2022; 47:495-500. [PMID: 35001677 DOI: 10.1177/17531934211065879] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 02/03/2023]
Abstract
The Kapandji test is a simple method to score thumb opposition; however, the position of the interphalangeal joint of the thumb during this test has not been described. We aimed to quantitatively examine the effect of the thumb interphalangeal joint position on movements of the trapeziometacarpal joint during thumb opposition using the Kapandji test. The Kapandji test was carried out in 20 healthy participants during thumb interphalangeal joint extension and flexion. Movements of the joints and the activity of thenar muscles were recorded using motion capture and electromyography, respectively. We found that interphalangeal joint extension increased the trapeziometacarpal joint movement and thenar muscle activity compared with interphalangeal joint flexion, which contributed to thumb opposition at Kapandji Positions 0-6. These findings suggest the position of the thumb interphalangeal joint affects the trapeziometacarpal joint during thumb opposition, and assessment of thumb opposition using the Kapandji test is best done with the thumb interphalangeal joint in extension.
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Affiliation(s)
- Hiroshi Kurumadani
- Analysis and Control of Upper Extremity Function, Hiroshima University, Hiroshima, Japan
| | - Kazuya Kurauchi
- Analysis and Control of Upper Extremity Function, Hiroshima University, Hiroshima, Japan
| | - Shota Date
- Analysis and Control of Upper Extremity Function, Hiroshima University, Hiroshima, Japan
| | - Yosuke Ishii
- Department of Biomechanics, Hiroshima University, Hiroshima, Japan
| | - Toru Sunagawa
- Analysis and Control of Upper Extremity Function, Hiroshima University, Hiroshima, Japan
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Yi J, Jeong HW, Cho HR, Kang KN, Lee J, Lee S, Cho J, Bang YS, Kim YU. Prediction of carpal tunnel syndrome using the thenar muscle cross-sectional area by magnetic resonance imaging. Medicine (Baltimore) 2021; 100:e27536. [PMID: 34731150 PMCID: PMC8519254 DOI: 10.1097/md.0000000000027536] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 06/14/2021] [Accepted: 09/30/2021] [Indexed: 01/05/2023] Open
Abstract
Carpal tunnel syndrome (CTS) is a common neuropathy. Although CTS progression is known to be associated with thenar muscle (TM) atrophy, the diagnostic value of TM atrophy for CTS has not been established. In this research, the thenar muscle cross-sectional area (TMCSA) was evaluated to analyze the relationship between the TMCSA and CTS. We assumed that TMCSA is a major diagnostic parameter in the CTS.Both TMCSA and thenar muscle thickness (TMT) samples were acquired from 18 CTS patients, and from 18 control subjects who underwent wrist magnetic resonance imaging with no evidence of CTS. T2-weighted transverse magnetic resonance imaging images were obtained. We measured the TMCSA and TMT at the level of first carpometacarpal joint.The average TMCSA was 296.98 ± 49.39 mm2 in the normal group and 203.36 ± 72.13 mm2 in the CTS group. The average TMT was 8.54 ± 1.45 mm in the normal group and 7.38 ± 1.14 mm in the CTS group. CTS group had significantly lower TMCSA and TMT. Receiver operator characteristics curve analysis showed that the best cutoff point for the TMCSA was 260.18 mm2, with 77.8% sensitivity, 77.8% specificity. The best cutoff point of the TMT was 7.70 mm, with 61.1% sensitivity, 66.7% specificity.Although the TMCSA and TMT were both significantly associated with CTS, the TMCSA was a much more sensitive measurement parameter. Thus, to evaluate CTS patients, the physician should more carefully inspect the TMCSA than TMT.
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Affiliation(s)
- Jungmin Yi
- Department of Anesthesiology and Pain Medicine, Catholic Kwandong University of Korea College of Medicine, International St. Mary's Hospital, Incheon, Republic of Korea
| | - Hye-Won Jeong
- Department of Anesthesiology and Pain Medicine, Catholic Kwandong University of Korea College of Medicine, International St. Mary's Hospital, Incheon, Republic of Korea
| | - Hyung Rae Cho
- Department of Anesthesiology and Pain Medicine, Myongji Hospital, Hanyang University College of Medicine, Republic of Korea
| | - Keum Nae Kang
- Department of Anesthesiology and Pain Medicine, National Police Hospital, Seoul, Republic of Korea
| | - Jonghyuk Lee
- Department of Anesthesiology and Pain Medicine, National Police Hospital, Seoul, Republic of Korea
| | - Sooho Lee
- Department of Anesthesiology and Pain Medicine, Catholic Kwandong University of Korea College of Medicine, International St. Mary's Hospital, Incheon, Republic of Korea
| | - Jaeho Cho
- Department of Anesthesiology and Pain Medicine, CHA Bundang Medical Center, CHA University, Seongnam, Republic of Korea
| | - Yun-Sic Bang
- Department of Anesthesiology and Pain Medicine, CHA Bundang Medical Center, CHA University, Seongnam, Republic of Korea
| | - Young Uk Kim
- Department of Anesthesiology and Pain Medicine, Catholic Kwandong University of Korea College of Medicine, International St. Mary's Hospital, Incheon, Republic of Korea
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Kuroiwa T, Nimura A, Takahashi Y, Sasaki T, Koyama T, Okawa A, Fujita K. Device Development for Detecting Thumb Opposition Impairment Using Carbon Nanotube-Based Strain Sensors. SENSORS 2020; 20:s20143998. [PMID: 32708416 PMCID: PMC7412202 DOI: 10.3390/s20143998] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 06/02/2020] [Revised: 07/07/2020] [Accepted: 07/15/2020] [Indexed: 12/03/2022]
Abstract
Research into hand-sensing is the focus of various fields, such as medical engineering and ergonomics. The thumb is essential in these studies, as there is great value in assessing its opposition function. However, evaluation methods in the medical field, such as physical examination and computed tomography, and existing sensing methods in the ergonomics field have various shortcomings. Therefore, we conducted a comparative study using a carbon nanotube-based strain sensor to assess whether opposition movement and opposition impairment can be detected in 20 hands of volunteers and 14 hands of patients with carpal tunnel syndrome while avoiding existing shortcomings. We assembled a measurement device with two sensors and attached it to the dorsal skin of the first carpometacarpal joint. We measured sensor expansion and calculated the correlation coefficient during thumb motion. The average correlation coefficient significantly increased in the patient group, and intrarater and interrater reliability were good. Thus, the device accurately detected thumb opposition impairment due to carpal tunnel syndrome, with superior sensitivity and specificity relative to conventional manual inspection, and may also detect opposition impairment due to various diseases. Additionally, in the future, it could be used as an easy, affordable, and accurate sensor in sensor gloves.
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Affiliation(s)
- Tomoyuki Kuroiwa
- Department of Orthopaedic and Spinal Surgery, Graduate School of Medical and Dental Sciences, Tokyo Medical and Dental University, Tokyo 113-8519, Japan; (T.K.); (T.S.); (T.K.); (A.O.)
| | - Akimoto Nimura
- Department of Functional Joint Anatomy, Graduate School of Medical and Dental Sciences, Tokyo Medical and Dental University, Tokyo 113-8519, Japan;
| | - Yu Takahashi
- AI Group, Department of 1st Research and Development, Yamaha Corporation, Shizuoka 430-0904, Japan;
| | - Toru Sasaki
- Department of Orthopaedic and Spinal Surgery, Graduate School of Medical and Dental Sciences, Tokyo Medical and Dental University, Tokyo 113-8519, Japan; (T.K.); (T.S.); (T.K.); (A.O.)
| | - Takafumi Koyama
- Department of Orthopaedic and Spinal Surgery, Graduate School of Medical and Dental Sciences, Tokyo Medical and Dental University, Tokyo 113-8519, Japan; (T.K.); (T.S.); (T.K.); (A.O.)
| | - Atsushi Okawa
- Department of Orthopaedic and Spinal Surgery, Graduate School of Medical and Dental Sciences, Tokyo Medical and Dental University, Tokyo 113-8519, Japan; (T.K.); (T.S.); (T.K.); (A.O.)
| | - Koji Fujita
- Department of Functional Joint Anatomy, Graduate School of Medical and Dental Sciences, Tokyo Medical and Dental University, Tokyo 113-8519, Japan;
- Correspondence: ; Tel.: +81-3-5803-5279
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Kuroiwa T, Nimura A, Suzuki S, Sasaki T, Okawa A, Fujita K. Measurement of thumb pronation and palmar abduction angles with a small motion sensor: a comparison with Kapandji scores. J Hand Surg Eur Vol 2019; 44:728-733. [PMID: 31033377 DOI: 10.1177/1753193419843837] [Citation(s) in RCA: 11] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 02/03/2023]
Abstract
The Kapandji score is used widely to record thumb opposition and is the only alternative to angular measurements. We aimed to verify the extent to which the Kapandji score reflects the angle of pronation. We recruited volunteers with unaffected upper limbs (33 hands) and patients with carpal tunnel syndrome (20 hands). We attached a small gyroscope to the thumb metacarpal and measured the pronation and palmar abduction angles at each position of the Kapandji score in both groups. The Kapandji score showed a strong ceiling effect, and the increase in angle size at each Kapandji score levelled off around a score of 6 in both groups. A Kapandji score greater than 6 does not necessarily reflect thumb opposition. Level of Evidence: III.
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Affiliation(s)
- Tomoyuki Kuroiwa
- 1 Department of Orthopaedic and Spinal Surgery, Graduate School of Medical and Dental Sciences, Tokyo Medical and Dental University, Tokyo, Japan
| | - Akimoto Nimura
- 2 Department of Functional Joint Anatomy, Graduate School of Medical and Dental Sciences, Tokyo Medical and Dental University, Tokyo, Japan
| | - Shiro Suzuki
- 2 Department of Functional Joint Anatomy, Graduate School of Medical and Dental Sciences, Tokyo Medical and Dental University, Tokyo, Japan
| | - Toru Sasaki
- 1 Department of Orthopaedic and Spinal Surgery, Graduate School of Medical and Dental Sciences, Tokyo Medical and Dental University, Tokyo, Japan
| | - Atsushi Okawa
- 1 Department of Orthopaedic and Spinal Surgery, Graduate School of Medical and Dental Sciences, Tokyo Medical and Dental University, Tokyo, Japan
| | - Koji Fujita
- 1 Department of Orthopaedic and Spinal Surgery, Graduate School of Medical and Dental Sciences, Tokyo Medical and Dental University, Tokyo, Japan
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Kuroiwa T, Fujita K, Nimura A, Miyamoto T, Sasaki T, Okawa A. A new method of measuring the thumb pronation and palmar abduction angles during opposition movement using a three-axis gyroscope. J Orthop Surg Res 2018; 13:288. [PMID: 30445972 PMCID: PMC6240257 DOI: 10.1186/s13018-018-0999-3] [Citation(s) in RCA: 18] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 07/11/2018] [Accepted: 11/06/2018] [Indexed: 11/25/2022] Open
Abstract
Background Thumb opposition is vital for hand function and involves pronation and palmar abduction. The improvement of pronation is often used as one of the evaluation items of the opponensplasty method for severe carpal tunnel syndrome. However, most of the studies used substitution evaluation methods for measurement of the pronation angle. Thus, there is still no appropriate method for measuring thumb pronation angle accurately in carpal tunnel syndrome patients. In recent reports, a wearable gyroscope was used to evaluate upper extremity motions and it can be possibly used for accurate measurement of the thumb pronation angle along the three-dimensionally moving bone axis. Thus, we investigated the reliability of measuring thumb pronation using a gyroscope and evaluated whether this method can be used to detect opposition impairment. Methods The participants were volunteers with unaffected upper limbs (32 hands) and patients with carpal tunnel syndrome (27 hands). The pronation and palmar abduction angles during opposition movements were measured using a three-axis gyroscope that included a three-axis accelerometer. The gyroscope was fixed onto the first metacarpal bone and the thumb phalanx. Results The pronation and palmar abduction angles of the metacarpal bone and the palmar abduction angles of the phalanx significantly decreased in the carpal tunnel syndrome group. The pronation angle of the metacarpal bone during opposition movement peaked later than the palmar abduction angle in all hands. Conclusions We were able to measure the thumb pronation and palmar abduction angles using the three-axis gyroscope, and this tool was able to detect impairments of thumb opposition due to carpal tunnel syndrome. This could be a tool for measuring thumb and finger angles and for detecting impairments caused by various diseases.
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Affiliation(s)
- Tomoyuki Kuroiwa
- Department of Orthopaedic and Spinal Surgery, Graduate School of Medical and Dental Sciences, Tokyo Medical and Dental University, 1-4-5, Yushima, Bunkyo-ku, Tokyo, 113-8519, Japan
| | - Koji Fujita
- Department of Orthopaedic and Spinal Surgery, Graduate School of Medical and Dental Sciences, Tokyo Medical and Dental University, 1-4-5, Yushima, Bunkyo-ku, Tokyo, 113-8519, Japan.
| | - Akimoto Nimura
- Department of Functional Joint Anatomy, Graduate School of Medical and Dental Sciences, Tokyo Medical and Dental University, 1-4-5, Yushima, Bunkyo-ku, Tokyo, 113-8519, Japan
| | - Takashi Miyamoto
- Department of Functional Joint Anatomy, Graduate School of Medical and Dental Sciences, Tokyo Medical and Dental University, 1-4-5, Yushima, Bunkyo-ku, Tokyo, 113-8519, Japan
| | - Toru Sasaki
- Department of Orthopaedic and Spinal Surgery, Graduate School of Medical and Dental Sciences, Tokyo Medical and Dental University, 1-4-5, Yushima, Bunkyo-ku, Tokyo, 113-8519, Japan
| | - Atsushi Okawa
- Department of Orthopaedic and Spinal Surgery, Graduate School of Medical and Dental Sciences, Tokyo Medical and Dental University, 1-4-5, Yushima, Bunkyo-ku, Tokyo, 113-8519, Japan
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