Anatomy of Master Knot of Henry: A morphometric study on cadavers.
OBJECTIVE
The objective of this study was to evaluate the features of flexor hallucis longus (FHL), flexor digitorum longus (FDL) and flexor digitorum accessorius (FDA) muscles with relevance to the tendon grafts and to reveal the location of Master Knot of Henry (MKH).


METHODS
Twenty feet from ten formalin fixed cadavers were dissected, which were in the inventory of Anatomy Department of Medicine Faculty, Mersin University. The location of MKH was identified. Interconnections of FHL and FDL were categorized. According to incision techniques, lengths of FHL and FDL tendon grafts were measured. Attachment sites of FDA were assessed.


RESULTS
MKH was 12.61 ± 1.11 cm proximal to first interphalangeal joint, 1.75 ± 0.39 cm below to navicular tuberosity and 5.93 ± 0.74 cm distal to medial malleolus. The connections of FHL and FDL were classified in 7 types. Tendon graft lengths of FDL according to medial and plantar approaches were 6.14 ± 0.60 cm and 9.37 ± 0.77 cm, respectively. Tendon graft lengths of FHL according to single, double and minimal invasive incision techniques were 5.75 ± 0.63 cm, 7.03 ± 0.86 cm and 20.22 ± 1.32 cm, respectively. FDA was found to be inserting to FHL slips in all cases and it inserted to various surfaces of FDL.


CONCLUSION
The exact location of MKH and slips was determined. Two new connections not recorded in literature were found. It was observed that the main attachment site of FDA was the FHL slips. The surgical awareness of connections between the FHL, FDL and FDA, which participated in the formation of long flexor tendons of toes, could be important for reducing possible loss of function after tendon transfers postoperatively.
['Beger|Orhan|O|', 'Elvan|Özlem|Ö|', 'Keskinbora|Mert|M|', 'Ün|Burçin|B|', 'Uzmansel|Deniz|D|', 'Kurtoğlu|Zeliha|Z|']
D059925:Anatomic Landmarks D002102:Cadaver D005528:Foot D006801:Humans D019637:Orthopedic Procedures D019651:Reconstructive Surgical Procedures D013710:Tendons D020858:Tissue and Organ Harvesting
Master knot of Henry Flexor hallucis longus Flexor digitorum longus Flexor digitorum accessorius Slip Tendon transfer