Common peroneal nerve palsy after TKA in valgus deformities; a systematic review

Journal of Experimental Orthopaedics

Table 5 Specific ligament release and CPNP ratio

Released ligament	^A Studies (n)	Treated knees (%)	CPNP cases, (%)	P-value
No ITB releases	4	114 (9.7%)	4 (3.5%)
ITB release overall	19	1057 (90.3%)	14 (1.3%)	0.09
Pie-crusting	6	232 (21.9%)	3 (1.3%)
Subperiosteal	9	525 (49.7%)	6 (1.1%)
Transverse	2	208 (19.7%)	1 (0.5%)	0.66
Unclear ^A	2	92 (8.7%)	0 (0.0%)
No PLC releases	7	326 (33.2%)	7 (2.1%)
PLC release overall	10	656 (66.8%)	10 (1.5%)	0.60
Pie-crusting	2	71 (10.8%)	3 (2.4%)
Transverse	7	553 (84.3%)	7 (1.3%)	0.07
Unclear ^A	1	32 (4.9%)	0 (0.0%)
No LCL releases	18	608 (52.7%)	7 (1.2%)
LCL release overall	8	545 (47.3%)	14 (2.6%)	0.08
No POP releases	14	700 (75.7%)	9 (1.3%)
POP release overall	4	225 (24.3%)	5 (2.2%)	0.35

CPNP Common peroneal nerve palsy, ITB Iliotibial band, PLC Posterior lateral capsule, LCL Lateral collateral ligament, POP Popliteus tendon. A: Studies that released a lateral soft tissue, but without specifying in which manner this was performed
Studies that performed a specific ligament release on only a part of the total study population were excluded for analysis. One study [40] was excluded for analysis due to lack of data