Reducing the distal profile of dual mobility liners can mitigate soft-tissue impingement and liner entrapment without affecting mechanical performance.
Soft-tissue impingement with dual mobility liners can cause anterior hip pain and intra-prosthetic dislocation. The hypothesis of this study was that reducing liner profile below the equator (contoured design) can mitigate soft-tissue impingement without compromising inner-head pull-out resistance and hip joint stability. The interaction of conventional and contoured liners with anterior soft tissues was evaluated in cadaver specimens via visual observation and fluoroscopic imaging. Resistance to inner-head pull-out was evaluated via finite element analyses, and hip joint stability was evaluated by rigid-body mechanics simulation of dislocation in two modes (A, B). Cadaveric experiments showed that distal portion of conventional liners impinge on anterior hip capsule and cause iliopsoas tenting at low flexion angles (≤30°). During hip extension, the rotation imparted to the liner from posterior engagement with femoral neck was impeded by anterior soft-tissue impingement. The iliopsoas tenting was significantly reduced with contoured liners (p ≤ 0.04). Additionally, the contoured and conventional liners had identical inner-head pull-out resistance (901 N vs. 909 N), jump distance (9.4 mm mode-A, 11.7 mm mode-B) and impingement-free range of motion (47° mode-A, 29° mode-B). Thus, soft-tissue impingement with conventional dual mobility liners may be mitigated by reducing liner profile below the equator, without affecting mechanical performance. © 2015 Orthopaedic Research Society. Published by Wiley Periodicals, Inc. J Orthop Res 34:889-897, 2016.
Department of Orthopaedic Surgery, Technology Implementation Research Center, Massachusetts General Hospital, Boston, Massachusetts.
Kartik Mangudi
KM
Varadarajan
Department of Orthopaedic Surgery, Technology Implementation Research Center, Massachusetts General Hospital, Boston, Massachusetts.
Thomas
T
Zumbrunn
Department of Orthopaedic Surgery, Technology Implementation Research Center, Massachusetts General Hospital, Boston, Massachusetts.
Michael Patrick
MP
Duffy
Department of Orthopaedic Surgery, Technology Implementation Research Center, Massachusetts General Hospital, Boston, Massachusetts.
Rajan
R
Patel
Department of Orthopaedic Surgery, Technology Implementation Research Center, Massachusetts General Hospital, Boston, Massachusetts.
Andrew A
AA
Freiberg
Department of Orthopaedic Surgery, Technology Implementation Research Center, Massachusetts General Hospital, Boston, Massachusetts.
Harry E
HE
Rubash
Department of Orthopaedic Surgery, Technology Implementation Research Center, Massachusetts General Hospital, Boston, Massachusetts.
Henrik
H
Malchau
Department of Orthopaedic Surgery, Technology Implementation Research Center, Massachusetts General Hospital, Boston, Massachusetts.
Orhun K
OK
Muratoglu
D000368:Aged; D005260:Female; D006622:Hip Prosthesis; D006801:Humans; D008297:Male; D008875:Middle Aged; D011474:Prosthesis Design
anterior hip pain; dual mobility; iliopsoas; intra-prosthetic dislocation; soft-tissue impingement