Table 2 Other studies concerned with surgical hip dislocation

Gardener et al.

2005

2 cases

Pipkin type II (2 cases)

None

–

Henle et al.

2007

12 case

Pipkin type I (1 case)

Pipkin type II (3 cases)

Pipkin type IV (8 cases)

Merle d’Aubigne and Postel score

Thompson and Epstein score

31

Osteonecrosis ( 2 cases)

Heterotopic ossification (5 cases)

Reduced range of motion (4 cases)

Solberg et al.

2009

12 case

Pipkin type IV fractures

Merle d’Aubigne´and Postel score

Thompson–Epstein

scoring

47

Osteonecrosis (1 case)

Heterotopic ossification (3 cases)

Kokubo et al.

2012

12 cases

(3 cases treated with trochanteric flip osteotomy

all of them of Pipkin type IV)

Pipkin type I (5 cases)

Pipkin type II (2 cases)

Pipkin type III (2 cases)

Pipkin IV

(3 cases)

Thompson and Epstein’s score

115

Osteoarthritis in one case treated later on by THA

Heterotopic ossification (1 case)

Masse et al.

2014

13 case

Pipkin type I (5 cases)

Pipkin type II (two cases)

Pipkin type IV (6 cases)

Modified Harris hip score

77

Osteonecrosis (1 case)

Heterotopic ossification (2 cases)

Arthritis (1 case)

Moustafa et al.

2014

23 cases (only 12 cases treated with trochanteric flip osteotomy)

Pipkin type I

( 5 cases)

Pipkin type II (18 case)

Modified Merle d’Aubigne and Postel

Thompson and Epstein scores

31

Osteonecrosis (1 case)

Nonunion of the trochanteric

osteotomy developed in one patient

Gavaskar et al.

2015

26 case

Pipkin type I (22 case)

Pipkin type II

( 4 case)

Modified Merle d’Aubigne

score

Oxford hip score

36

No osteonecrosis

Heterotopic ossification (5 cases)

Deep infection (1 case)

Painful trochanteric bursitis (1 case) which relieved after screw removal

Stirma et al.

2018

4 cases

Pipkin type I (2 cases),

Pipkin type II (1 case)

Pipkin type IV

(1 case)

Harris Hip Score

15

1 case progressed to deep surgical site infection. He underwent total hip arthroplasty after 1 year of follow-up later on

1 case evolved with heterotopic calcification

No cases of femoral head necrosis were identified

Wang et al.

2019

12 case

Pipkin type I (4 cases),

Pipkin type II (3 case)

Pipkin type IV

(5 cases)

The modified Merle d’Aubigne scores

35

Osteonecrosis (one case)

Heterotopic ossification (4 cases)

Rana et al.

2020

6 cases

–

Harris Hip Score

10.8

Osteonecrosis (2 cases)

Khalifa et al.

2020

27 cases

Pipkin type I (6 cases),

Pipkin type II (13 case)

Pipkin type IV

(8 case)

Modified

Harris hip Modified Merle d’Aubigne and Postel scores

48

Osteonecrosis (2 cases)

Heterotopic ossification (5 cases)

Hip arthritis (1 case)

Engel et al.

2021

7 cases

Pipkin type IV

(7 case)

None

894.57 ± 496.16 days

Osteonecrosis (2 cases)

Heterotopic ossification (1 case)

Hip arthritis (6 cases (4 converted to THA))

Deep infection (one case)

Current study

2022

18 case

Pipkin type I (6 cases),

Pipkin type II (12 cases)

Modified

Harris Hip and Modified Merle d’Aubigne and Postel scores

40

Osteonecrosis (1 case)