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Research Article
Revised

Morphological study of the popliteus muscle-tendon complex in formalin embalmed adult cadavers

[version 4; peer review: 1 approved, 2 approved with reservations]
PUBLISHED 05 Jun 2024
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This article is included in the Manipal Academy of Higher Education gateway.

Abstract

Background

The dimensions of popliteus muscle and its tendon are subjected to variability in the origin, mode of insertion, innervation patterns and vascular supply. The aim of this study was to measure the length, thickness and width of the popliteus muscle and its tendon at its different parts. The objectives were to study the topographic anatomy of the neurovascular structures of the popliteus and also to determine the dimensions of the popliteo-fibular ligament.

Methods

This descriptive cross sectional institutional based study included 50 formalin embalmed adult lower limb specimens. The measurements were performed by using the digital Vernier caliper.

Results

The length of the popliteus muscle belly along the upper and lower border were 44.2±6.63 mm and 89.26±14.41 mm, width of the muscle belly at midpoint, musculotendinous junction and insertion were 28.45±6.85 mm, 11.7±3.5 mm and 75.95±10.7 mm. The thickness of muscle belly at the midpoint was 2.55±0.55 mm. The length of popliteal tendon, width at origin and at musculotendinous junction were 24.85±2.15 mm, 7.55±1.55 mm and 8.5±1.15 mm. The thickness of tendon of popliteus was 2.6±0.75 mm. The length of nerve to popliteus was 50.44±8.66 mm and its origin was located 27.54±6.18 mm from the intercondylar line. The distance of origin of medial and lateral geniculate arteries from the intercondylar line were 26.26±10.47 mm and 20.76±5.19 mm. The distance of division of popliteal artery was 49.44±16.26 mm from the intercondylar line. The length and width of the popliteo-fibular ligament was 17.84±3.43 mm and 7.36±1.9 mm individually.

Conclusions

This study offered detailed morphometric data of the popliteus and it is believed that the data of this anatomical research is enlightening to orthopedic surgeons particularly in the field of arthroscopic and plastic surgery. The data can be considered as the database from our population.

Keywords

Arthroscopic Surgery; Popliteus; Plastic Surgery

Revised Amendments from Version 3

As per the reviewer's comments, the details of the points considered for performing the measurements are given. They are tabulated and clearly state the topographical location of the measurements performed. The sex based comparison of the parameters and their significance are given. Male Vs. Female were compared by applying the independent samples 't' test. They are inserted as newer tables in this version. The stature of the male and female cadavers are given. The length of the thigh was measured from the anterior superior iliac spine and the medial condyle of femur. This data is also added in this revised version. The exclusion criteria are given in detail. The positioning of the lower limb during the dissection is also given.

See the authors' detailed response to the review by Graham Louw
See the authors' detailed response to the review by Kyutaro Kawagishi

Introduction

The popliteus is a muscle in the posterior compartment of the lower extremity, which is located at the leg and innervated by the tibial nerve. This is the only muscle in the back of leg, which acts on the knee joint and not over the ankle joint. This is considered as the unlocking muscle of the knee joint.1 It laterally rotates the femur over the tibia, while walking when one foot is on the ground. It helps in the knee stabilization along with the fibular collateral and popliteo-fibular ligaments.1 The popliteus has dual origin, one from the lateral femoral condyle and the other from the lateral meniscus. Its origin is tendinous and it is interesting to know that there exists variability in its origin like from the styloid process of the fibula.2 On few occasions, an accessory head of popliteus may originate from the sesamoid bone at the gastrocnemius lateral head.3 On rare occasions, there may be a popliteus minor muscle, which originates from the femur over the deep part of the plantaris muscle and its distal attachment is at the posterior aspect of knee joint.2 The popliteal tendon occupies a part of the knee joint capsule; however, it does not enter the synovial cavity. Hence it is intra-capsular, however extra-articular and extra-synovial.4 It runs underneath the fibular collateral ligament and biceps femoris tendon. The popliteus separates the lateral collateral ligament from the lateral meniscus and prevents its injury.5 The popliteus inserts at the dorsal aspect of the tibial upper end just over the soleal line. More clinical and basic anatomical studies are needed to understand the injuries and pathological involvement of popliteus in order to accomplish the better diagnosis and management.6 In this situation, the primary goal was to determine the dimensions of different parameters of popliteal muscle tendon complex at its various parts. The objectives were to measure the dimensions of popliteo-fibular ligament and to study the topographic anatomy of the neurovascular structures supplying the popliteus.

Methods

This is a descriptive cross sectional institutional based study, which involved 25 formalin embalmed adult cadavers from Indian population. Among them, 16 were male cadavers and 9 were female. The sample size is similar to the earlier study performed by Olewnik et al.1 The protocol of this anatomical research is available at dx.doi.org/10.17504/protocols.io.3byl4qqk8vo5/v1. Meticulous dissection was performed to expose the popliteus muscle, tendon and its neurovascular structures. In total, 50 popliteus muscles were analyzed based on the side. Among them 32 lower limbs were of male and 18 were from female, the present study also analysed sex-based differences. The inclusion criteria were adult embalmed cadavers, which were available at the department of anatomy. Cadavers showing pathological changes and congenital anomalies at the knee joint were excluded from this study. The exclusion criteria also included the previously dissected cadavers, amputated extremities and the cadavers, which had flexion of knee joint due to the rigor mortis. The popliteal fossa was meticulously dissected by positioning the cadavers in the prone position and the knee joint was positioned in extension during the dissection in all the lower extremities. The measurements were performed by using the digital Vernier caliper (Mitutoyo Digital Vernier Caliper 0-150 mm 500-196 made in Japan) and the analysis of the data was done by using the recent version of SPSS (version 27) software after applying the paired t-test. The sex-based comparison was performed by applying the independent samples ‘t’ test. Single person, who is a coauthor in this study, performed all the measurements. This was followed to prevent the inter-observer bias and the measurements were taken on three consecutive times. The average of which was considered to prevent the intra-observer bias. The measurements of the popliteus muscle tendon complex are schematically represented in Figure 1 and tabulated in Table 1.

6335ad9c-7088-438b-b1a6-50824c7c12c1_figure1.gif

Figure 1. Schematic representation of the measurements of popliteus muscle tendon complex, which are performed in this study (refer to the details in Table 1).

Table 1. Measurements of the popliteus muscle tendon complex performed in this study.

No.ParameterRepresentation in Figure 1
1mediolateral length along the upper border of popliteusAB
2mediolateral length along the lower border of popliteusCD
3width at the muculotendinous junction of popliteusBD
4width at the midpoint of popliteusEF
5width at the insertion of popliteusAC
6thickness at the midpoint of popliteus along the lower border of popliteusF
7length of popliteal tendonBG
8width of popliteal tendon at originGH
9width of politeal tendon at muculotendinous junctionBI
10thickness of popliteal tendon at mid pointJ
11distance of origin of medial geniculate artery from the intercondylar line-
12distance of origin of lateral geniculate artery from the intercondylar line-
13distance of division of popliteal artery from the intercondylar line-
14distance of origin of nerve to popliteus from the intercondylar line-
15length of nerve to popliteus-
16length of popliteo-fibular ligamentKL
17width of popliteo-fibular ligamentMN

The explanation as to what anatomical structures and features have been listed as points ‘A’ to ‘N’ in Figure 1 and Table 1 are explicated in Table 2.

Table 2. Points used to label the dimensions measured in this study and their topographical location.

PointTopographical location
Asuperior most point of the insertion of popliteus muscle at the postero-medial aspect of tibia.
Bsuperior most point of the musculotendinous junction of the popliteus muscle.
Cinferior most point of the insertion of popliteus muscle at the postero-medial aspect of tibia.
Dinferior most point of the musculotendinous junction of the popliteus muscle.
Emidpoint of the upper limit of the muscle belly of popliteus muscle.
Fmidpoint of the lower limit of the muscle belly of popliteus muscle.
Gsuperior most point of the origin of popliteus tendon at the popliteal sulcus in the lateral condyle of femur.
Hinferior most point of the origin of popliteus tendon at the popliteal sulcus in the lateral condyle of femur.
Iinferior most point of the musculotendinous junction of the popliteus muscle.
Jthickness of popliteal tendon at mid-point, which is the midpoint of the distance between point ‘H’ and point ‘I’.
Kmid-point of the superior most part of the popliteo-fibular ligament at the musculotendinous junction of the popliteus muscle.
Lmid-point of the inferior most part of the popliteo-fibular ligament at the styloid process of fibula.
Mmedial most limit of the mid-point of the distance between point ‘K’ and point ‘L’.
Nlateral most limit of the mid-point of the distance between point ‘K’ and point ‘L’.

This anatomical research has received the approval from the ethics committee of our institution (Approval Committee Name: Institutional Ethics Committee, Kasturba Medical College, Mangalore, Approval Number: IEC KMC MLR: 09/2022/400, dated 21.09.2022). Since this is a study from the human cadavers, the consent from the participants is not applicable. This was waived by our institutional ethics committee. The consent was already given by the participant to perform the medical teaching and research, while donating his or her body. This present research is following the guidelines of the international ethical standards.

Results

In the present study, the stature of males were ranging between 146 cm to 172 cm (159.2±7.7 cm) and females were between 142 cm to 151 cm (145.8±3.4 cm). Length of the thigh, which was measured from the anterior superior iliac spine to the medial condyle of femur was measuring 45.6±3.4 cm in males and 39.8±6.3 cm in females.

The length of the popliteus muscle belly along the upper and lower border were 44.2±6.63 mm and 89.26±14.41 mm, width of the muscle belly at midpoint, musculotendinous junction and insertion were 28.45±6.85 mm, 11.7±3.5 mm and 75.95±10.7 mm.18 The thickness of muscle belly at the midpoint was 2.55±0.55 mm. The morphometric data of the popliteus muscle belly are given in Table 3. The length of popliteal tendon, width at origin and at musculotendinous junction were 24.85±2.15 mm, 7.55±1.55 mm and 8.5±1.15 mm. The thickness of tendon of popliteus was 2.6±0.75 mm. Table 4 represents the dimensions of the tendon of popliteus of this study.

Table 3. Morphometric data of the popliteus muscle belly (n=50).

Dimension of the musclemean±SD
mediolateral length along upper border44.2±6.63
mediolateral length along lower border89.26±14.41
width at the musculotendinous junction11.7±3.5
width at the midpoint28.45±6.85
width at the insertion75.95±10.7
thickness at the midpoint along lower border2.55±0.55

Table 4. Morphometric data of the tendon of popliteus (n=50).

Dimension of the tendonmean±SD
length24.85±2.15
width at origin7.55±1.55
width at musculotendinous junction8.5±1.15
thickness2.6±0.75

The length of nerve to popliteus was 50.44±8.66 mm and its origin was located 27.54±6.18 mm from the intercondylar line. The distance of origin of medial and lateral geniculate arteries from the intercondylar line were 26.26±10.47 mm and 20.76±5.19 mm. The distance of division of popliteal artery was 49.44±16.26 mm from the intercondylar line. Table 5 offers the topographic anatomy of the neurovascular structures of popliteus. The length and width of the popliteo-fibular ligament was 17.84±3.43 mm and 7.36±1.9 mm individually. They are summarized in Table 6 and the sidewise comparison of all the parameters, which are measured in this study are given in Table 7, Table 8, Table 9 and Table 10. The statistical significance was not there, when the right and left side comparison was considered (p>0.05). The only significant difference was observed for the width of the popliteal muscle at the insertion, which was higher for the left side (p<0.05).

Table 5. Topography of the neurovascular structures of popliteus (n=50).

Neurovascular supply to popliteusmean±SD
distance of origin of MGA from the ICL26.26±10.47
distance of origin of LGA from the ICL20.76±5.19
distance of division of PA from the ICL49.44±16.26
distance of origin of NP from the ICL27.54±6.18
length of NP50.44±8.66

Table 6. Morphometric data of the popliteo-fibular ligament (n=50).

Popliteo-fibular ligamentmean±SD
length17.84±3.43
width7.36±1.9

Table 7. Sidewise comparison of morphometric data of the popliteus muscle belly (n=50).

Dimension of the muscleRight side (n=25)Left side (n=25)
mediolateral length along upper border44.88±7.4443.52±5.82
mediolateral length along lower border88.12±17.0690.4±11.77
width at the musculotendinous junction12.4±4.311±2.7
width at the midpoint28.8±6.528.1±7.2
width at the insertion*72.5±9.979.4±11.5
thickness at the midpoint2.6±0.72.5±0.4

Table 8. Sidewise comparison of morphometric data of the tendon of popliteus (n=50).

Dimension of the tendonRight side (n=25)Left side (n=25)
length25±2.524.7±1.8
width at origin7.1±1.88±1.3
width at musculotendinous junction8.6±1.28.4±1.1
thickness2.4±0.72.8±0.8

Table 9. Sidewise comparison of the topography of the neurovascular structures of popliteus (n=50).

Neurovascular supply to popliteusRight side (n=25)Left side (n=25)
distance of origin of MGA from the ICL23.24±9.5429.28±11.41
distance of origin of LGA from the ICL20.72±4.9620.8±5.42
distance of division of PA from the ICL46.76±18.6152.12±13.92
distance of origin of NP from the ICL28.56±7.3226.52±5.04
length of NP51.4±8.4449.48±8.89

Table 10. Sidewise comparison of the morphometric data of the popliteo-fibular ligament (n=50).

Popliteo-fibular ligamentRight side (n=25)Left side (n=25)
length17.84±3.2317.84±3.63
width6.92±1.577.8±2.23

The sex wise comparison of the data of present study are represented in Tables 11, 12, 13 and 14. There was statistical significance observed in some of the parameters measured (p<0.05), the dimensions were higher in males in comparison to females. However, there was no significance in some of the other parameters measured (p>0.05).

Table 11. Sex based comparison of morphometric data of the popliteus muscle belly (n=50)

Dimension of the muscleMale (n=32)Female (n=18)
mediolateral length along upper border45.1±3.241.1±5.6
mediolateral length along lower border88.7±17.683.3±31.4
width at the musculotendinous junction*12.4±6.410.4±0.5
width at the midpoint28.8±226.2±1.3
width at the insertion*79.4±4.572.5±2.3
thickness at the midpoint*2.9±0.042.1±0.05

* Statistical significance (p<0.05).

Table 12. Sex based comparison of morphometric data of the tendon of popliteus (n=50).

Dimension of the tendonMale (n=32)Female (n=18)
length*25.1±4.722.6±6.6
width at origin*7.6±4.66.5±1.6
width at musculotendinous junction*8.5±2.87.6±1.4
thickness2.5±1.72.3±1.1

* Statistical significant difference (p<0.05).

Table 13. Sexwise comparison of the topography of the neurovascular structures of popliteus (n=50).

Neurovascular supply to popliteusMale (n=32)Female (n=18)
distance of origin of MGA from the ICL23.2±4.124.4±4.1
distance of origin of LGA from the ICL*20.7±0.917.2±0.9
distance of division of PA from the ICL*46.7±10.434.9±2.6
distance of origin of NP from the ICL*28.6±1.920.8±4
length of NP*55.9±3.733.9±6.6

* Statistical significant difference (p<0.05).

Table 14. Sex based comparison of the morphometric data of the popliteo-fibular ligament (n=50).

Popliteo-fibular ligamentMale (n=32)Female (n=18)
length17.7±0.516.3±3.2
width*7±2.45.4±1.5

* Statistical significant difference (p<0.05).

The present study observed that, there was single twig (Figure 2) of nerve to popliteus in 17 lower limbs (34% cases), there were two twigs (Figure 3) in 42% cases (in 21 lower limbs) and the nerve to popliteus was giving 3 twigs (Figure 4) in 12 lower extremities (24%). The frequency of distribution of nerve to popliteus is represented in Figure 5.

6335ad9c-7088-438b-b1a6-50824c7c12c1_figure2.gif

Figure 2. Posterior view of the right lower limb of the cadaver showing the nerve to popliteus (NP), which was giving single twig (34% cases) to popliteus (1-single twig; TN-tibial nerve; CPN-common peroneal nerve; MGA-middle genicular artery).

6335ad9c-7088-438b-b1a6-50824c7c12c1_figure3.gif

Figure 3. Posterior view of the left lower limb of the cadaver showing the nerve to popliteus (NP), which was giving double twig (42% cases) to popliteus (1-first twig; 2-second twig; TN-tibial nerve; CPN-common peroneal nerve; IMGA-inferior medial genicular artery; ILGA-inferior lateral genicular artery; PA-popliteal artery; PV-popliteal vein).

6335ad9c-7088-438b-b1a6-50824c7c12c1_figure4.gif

Figure 4. Posterior view of the left lower limb of the cadaver showing the nerve to popliteus (NP), which was giving three twigs (24% cases) to popliteus (1-first twig; 2-second twig; 3-third twig; TN-tibial nerve; CPN-common peroneal nerve; IMGA-inferior medial genicular artery; ILGA-inferior lateral genicular artery; PA-popliteal artery; PV-popliteal vein).

6335ad9c-7088-438b-b1a6-50824c7c12c1_figure5.gif

Figure 5. Frequency of muscular branching pattern of the nerve to popliteus (n=50).

Discussion

The popliteus muscle is the unlocking muscle of the knee and avoids the medial rotation of femur over tibia.7 It is known for variations and this is explained on the basis of phylogeny.8 In reptiles, fibula directly articulates with the lateral femoral condyle, so popliteus is more occupied between the proximal parts of tibia and fibula. In mammals, femur articulates with tibia, leading to the migration of popliteus muscle proximally until the lateral femoral condyle. In humans, attachment of popliteus to fibula is represented by the popliteo-fibular ligament. This is very important as it stabilizes the posterolateral aspect of the femoro-tibial articulation. According to Vani and Raveendranath,9 the length and width of tendon of popliteus was 35.12 mm and 9.52 mm, which was comparable to the dimensions by Jung et al.10 and Osti et al.11 LaPrade et al.12 reported that the length of popliteus tendon measures 54.5 mm. In our research, the same parameters were 24.85 ± 2.15 mm and the width at the musculotendinous junction was 8.5±1.15 mm. These dimensions are slightly lower in comparison to the data by Vani and Raveendranath.9 In their study, the distance of distal attachment of popliteus from its musculotendinous junction was 107.14±13.45 mm and widest part of popliteus measured 32.38±4.33 mm. Kurtoglu et al.13 reported in their study that popliteus muscle belly length and width were 107.14mm and 32.38mm. However, the mediolateral length of popliteus along the lower border was 89.26±14.41 mm in our study and the width of popliteus at the midpoint was 28.45±6.85 mm. These dimensions are small in comparison to Kurtoglu et al.,13 may be because of ancestral variations. Hwang et al.14 reported the popliteal length at its lateral border, which was 119±15 mm. This was almost parallel to the findings of Vani and Raveendranath.9 In the present study, this dimension was not performed and the morphometric data of the length and width of popliteus is different in our study in comparison to previous studies, as the different points were used for the measurements. The positive outcome of this anatomical research was we measured the length of the popliteus at both the upper and lower borders.

Vani and Raveendranath9 reported that, the distance of origin of nerve to popliteus from the intercondylar line ranged between 12.10±10.54 mm above the intercondylar line to 18.74±11.51 mm below the intercondylar line. In the present study, this distance was measuring 27.54±6.18 mm below the intercondylar line. In most of our specimens, it was observed that, nerve to popliteus was arising separately and was not giving the nerve to soleus or nerve to tibialis posterior. We could observe that; these nerves were separate branches coming from the tibial nerve. However, previous authors mentioned that, nerve to tibialis posterior originates from the nerve to popliteus.14

In the present study, it was observed that the nerve to popliteus along with the blood vessels, descend anterior to the popliteus muscle and enter at its anterior surface, which is obvious in Figure 2. The basic anatomical knowledge of these structures can enlighten the plastic surgeons during the reconstruction surgeries of popliteus. The anatomy and biomechanics of popliteus makes it an important structure, which keeps the knee stable. But its involvement is ignored in the complex injury of the knee joint.6 The isolated involvement of popliteus is seen in sports injuries and it may be misinterpreted as a tear of lateral meniscus. The sports like tennis, basketball and downhill running may put additional stress on the tendon of popliteus.6 The present study provided the data about the neurovascular structures in relation to the popliteus and it is believed that these details are clinically important for the effective treatment of the popliteus muscle spasticity.15 Popliteus muscle tendon complex is a landmark to the operating surgeon during the sling reconstruction of popliteus tendon.16 Popliteus is commonly injured in the posterolateral impact at the femoro-tibial articulation and gets torn. The muscular strains are also common in the sports injuries, which commonly affect the popliteus at its tendino-muscular junction.17 Due to all these implications, the present study was undertaken. The literature search did not reveal much studies about the morphometry of the popliteus and particularly, the dataset is not available from the Indian population. In this context, the data of the present study is enlightening to the orthopedic surgeons, particularly for the posterior knee approach procedures like baker’s cyst excision, fixation of tibial plateu fractures and meniscal tears.

However, the present study has limitations like the smaller sample size particularly the female cadavers, which were very less. It was observed that, few of the dimensions measured were smaller in females in comparison to males. The other measurements did not reveal statistical significance (p>0.05). In this study, repeatability of the measurements by asking a secondary observer was not performed. It would have been better if a subset of the sample was measured by a secondary observer and intraclass correlation was applied statistically. The correction factor for overall height of the body is not given in this study, which is also another limitation of this study. The anatomical points for the morphometry were approximately considered, which may not be the perfect method.

This study has failed to provide the statistical difference or correlation between the parameters like age and stature. There is no correlation between stature and muscle length or any other parameters in this study. This was not possible to perform as the sample size in this study was less. The comparison of the muscle belly thickness in the formaldehyde-fixed cadavers is one of the most challenging methods, because we might not know whether the muscle is in the contracting or relaxing phase. Moreover, the muscle belly easily changes its shape while dissecting the cadaver, even in formaldehyde-fixed cadavers.

These are the other potential limitations of this anatomical research.

Conclusion

The present study offered the detailed morphometric data about the dimensions of the popliteus muscle belly and its tendon along with the popliteo-fibular ligament. It is believed that, the data of popliteal muscle tendon complex of this study will be enlightening to the orthopedic surgeons particularly in the field of arthroscopic and plastic surgery like the reconstruction. The data can be considered as the database for our population.

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Vadgaonkar R, Tonse M, Blossom V et al. Morphological study of the popliteus muscle-tendon complex in formalin embalmed adult cadavers [version 4; peer review: 1 approved, 2 approved with reservations]. F1000Research 2024, 12:1329 (https://doi.org/10.12688/f1000research.141366.4)
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Version 4
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Reviewer Report 31 Oct 2024
Andrew Emmanuel Tito, Mwanza University, Tanzania, Tanzania 
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On the Methodology
-The author should specify how many left and right lower limbs were dissected as there have been evidences of body side-based anatomical variations of structures. This could help to deduce any side-based differences or correlation in ... Continue reading
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Tito AE. Reviewer Report For: Morphological study of the popliteus muscle-tendon complex in formalin embalmed adult cadavers [version 4; peer review: 1 approved, 2 approved with reservations]. F1000Research 2024, 12:1329 (https://doi.org/10.5256/f1000research.167189.r330017)
NOTE: it is important to ensure the information in square brackets after the title is included in all citations of this article.
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Graham Louw, University of Cape Town, Cape Town, South Africa 
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The authors have updated the article with ... Continue reading
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Louw G. Reviewer Report For: Morphological study of the popliteus muscle-tendon complex in formalin embalmed adult cadavers [version 4; peer review: 1 approved, 2 approved with reservations]. F1000Research 2024, 12:1329 (https://doi.org/10.5256/f1000research.167189.r286864)
NOTE: it is important to ensure the information in square brackets after the title is included in all citations of this article.
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Reviewer Report 16 May 2024
Graham Louw, University of Cape Town, Cape Town, South Africa 
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Thank you to them for addressing some of the points raised by me.
 
Regarding Figure1 and Table 1, they state the following: The measurements of the popliteus muscle tendon complex are schematically represented in Figure 1 and ... Continue reading
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Louw G. Reviewer Report For: Morphological study of the popliteus muscle-tendon complex in formalin embalmed adult cadavers [version 4; peer review: 1 approved, 2 approved with reservations]. F1000Research 2024, 12:1329 (https://doi.org/10.5256/f1000research.164610.r264543)
NOTE: it is important to ensure the information in square brackets after the title is included in all citations of this article.
  • Author Response 21 Jun 2024
    B.V. Murlimanju, Department of Anatomy, Kasturba Medical College, Mangalore, Manipal Academy of Higher Education, Manipal, India
    21 Jun 2024
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    Dear Professor, thank you very much for the comments. In this revised version, the anatomical structures and features listed as letters ‘A’ to ‘N’ are detailed and clearly explicated. They ... Continue reading
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  • Author Response 21 Jun 2024
    B.V. Murlimanju, Department of Anatomy, Kasturba Medical College, Mangalore, Manipal Academy of Higher Education, Manipal, India
    21 Jun 2024
    Author Response
    Dear Professor, thank you very much for the comments. In this revised version, the anatomical structures and features listed as letters ‘A’ to ‘N’ are detailed and clearly explicated. They ... Continue reading
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Reviewer Report 20 Feb 2024
Kyutaro Kawagishi, International University of Health and Welfare, Chiba, Japan 
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The authors of the “Morphological study of the popliteus muscle-tendon complex in formalin embalmed adult cadavers” measured the sizes of the popliteus muscles in the 50 sides of the formaldehyde-fixed lower limbs (25 adult Indian cadavers). The authors listed data ... Continue reading
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HOW TO CITE THIS REPORT
Kawagishi K. Reviewer Report For: Morphological study of the popliteus muscle-tendon complex in formalin embalmed adult cadavers [version 4; peer review: 1 approved, 2 approved with reservations]. F1000Research 2024, 12:1329 (https://doi.org/10.5256/f1000research.160299.r238915)
NOTE: it is important to ensure the information in square brackets after the title is included in all citations of this article.
  • Author Response 19 Jun 2024
    B.V. Murlimanju, Department of Anatomy, Kasturba Medical College, Mangalore, Manipal Academy of Higher Education, Manipal, India
    19 Jun 2024
    Author Response
    As per the reviewer’s opinion, the potential limitations of this anatomical research are added in this revised version.
    Competing Interests: No competing interests were disclosed.
COMMENTS ON THIS REPORT
  • Author Response 19 Jun 2024
    B.V. Murlimanju, Department of Anatomy, Kasturba Medical College, Mangalore, Manipal Academy of Higher Education, Manipal, India
    19 Jun 2024
    Author Response
    As per the reviewer’s opinion, the potential limitations of this anatomical research are added in this revised version.
    Competing Interests: No competing interests were disclosed.
Views
5
Cite
Reviewer Report 10 Jan 2024
Graham Louw, University of Cape Town, Cape Town, South Africa 
Approved
VIEWS 5
Thank you for making the ... Continue reading
CITE
CITE
HOW TO CITE THIS REPORT
Louw G. Reviewer Report For: Morphological study of the popliteus muscle-tendon complex in formalin embalmed adult cadavers [version 4; peer review: 1 approved, 2 approved with reservations]. F1000Research 2024, 12:1329 (https://doi.org/10.5256/f1000research.160299.r232105)
NOTE: it is important to ensure the information in square brackets after the title is included in all citations of this article.
Version 1
VERSION 1
PUBLISHED 13 Oct 2023
Views
16
Cite
Reviewer Report 16 Oct 2023
Graham Louw, University of Cape Town, Cape Town, South Africa 
Approved with Reservations
VIEWS 16
Thank you for giving me the opportunity to read and comment on this submission.

This is an interesting study and the authors have done plenty of work to ensure that the research project was covered in depth.
... Continue reading
CITE
CITE
HOW TO CITE THIS REPORT
Louw G. Reviewer Report For: Morphological study of the popliteus muscle-tendon complex in formalin embalmed adult cadavers [version 4; peer review: 1 approved, 2 approved with reservations]. F1000Research 2024, 12:1329 (https://doi.org/10.5256/f1000research.154802.r215167)
NOTE: it is important to ensure the information in square brackets after the title is included in all citations of this article.
  • Author Response 18 Jan 2024
    B.V. Murlimanju, Department of Anatomy, Kasturba Medical College, Mangalore, Manipal Academy of Higher Education, Manipal, India
    18 Jan 2024
    Author Response
    1. Reviewer comment: This is an interesting study and the authors have done plenty of work to ensure that the research project was covered in depth.
    Author Reply: We thank ... Continue reading
COMMENTS ON THIS REPORT
  • Author Response 18 Jan 2024
    B.V. Murlimanju, Department of Anatomy, Kasturba Medical College, Mangalore, Manipal Academy of Higher Education, Manipal, India
    18 Jan 2024
    Author Response
    1. Reviewer comment: This is an interesting study and the authors have done plenty of work to ensure that the research project was covered in depth.
    Author Reply: We thank ... Continue reading

Comments on this article Comments (0)

Version 4
VERSION 4 PUBLISHED 13 Oct 2023
Comment
Alongside their report, reviewers assign a status to the article:
Approved - the paper is scientifically sound in its current form and only minor, if any, improvements are suggested
Approved with reservations - A number of small changes, sometimes more significant revisions are required to address specific details and improve the papers academic merit.
Not approved - fundamental flaws in the paper seriously undermine the findings and conclusions
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