Vascularized Bone Grafting for Scaphoid Nonunion with Humpback Deformity: The Surgical Technique

Abstract

Background Scaphoid nonunion with humpback deformity and avascular necrosis (AVN) is a challenging problem. Correction of dorsal intercalated segment instability (DISI) requires grafting of a large and hard vascularized bone segment onto the volar side of the scaphoid.

Purposes We have been treating the patients with one-incision vascularized bone grafting technique for scaphoid nonunion to improve blood supply and correct humpback deformity. We evaluated these cases retrospectively to the surgical efficacy of our procedure.

Methods We harvested vascularized bone from the dorsal side of the radius using the method by Zaidemberg et al and inserted the cortical aspect into the scaphoid volar side using a direct lateral approach. Totally, 11 patients (nine males andtwo females) with a mean age of 40 years were recruited for this study. The mean time from fracture to treatment was 6 years and 3 months. The mean preoperative radiolunate angle was 25 degrees. All the patients showed AVN of the proximal scaphoid on T1-weighted images. An averaged follow-up period was 2 years and 3 months.

Results Postoperative computed tomography revealed bony union in 10 patients (91% of union rate) with a mean modified Mayo'swrist score of 88 points (range, 75–100 points) and a mean disabilities of arm, shoulder, and hand (DASH) score of 4 points (range, 0–20 points). The mean radiolunate angle was corrected from 25 to 5 degrees. No adverse events were observed, except temporary mild paresthesia of the radial nerve territory in two patients.

Conclusion This technique effectively corrected DISI in patients with scaphoid nonunion accompanied by humpback deformity and AVN.

Keywords

scaphoid nonunion - vascularized bone graft - humpback deformity - direct lateral approach - radial approach

Bone grafting for scaphoid nonunion is performed using multiple techniques. Matti first reported grafting of bone onto the scaphoid dorsal side in 1936[1] and Russe later described a technique involving the volar side.[2] In 1970, Fisk suggested the use of a conventional wedge graft to correct scaphoid length.[3]

In 1991, Zaidemberg et al reported a technique for vascularized bone grafting based on the ascending irrigating branch of the radial artery.[4] In cases of scaphoid nonunion with avascular necrosis (AVN), such vascularized bone grafts may provide better results. Makino reported on the harvesting of vascularized bone from the dorsal base of the second metacarpal bone,[5] and subsequent reports have described treatments that involve harvesting vascularized bone from the volar aspect of the radius,[6] the first metacarpal bone,[7] or the head of the second metacarpal bone.[8]

Chang et al used the bone harvesting technique by Zaidemberg et al to treat a scaphoid nonunion with humpback deformity and AVN; however, the results were not satisfactory.[9] Fisk proposed that scaphoid nonunion with humpback deformity and AVN requires grafting of a large section of hard iliacbone onto the volar side to avoid loss of correction.[3] It is easier to isolate and preserve the vascular pedicle while transferring the graft from the dorsal side to the volar side using Makino's technique compared with the technique by Zaidemberg et al. However, with Makino's technique it is more difficult to harvest a large bone.

We believe, the harvesting of a large section of hard grafting vascularized bone is essential for optimal correction. Waitayawinyuetal reported one-incision radial approach technique with a radial stylodectomy to access the radial aspect of scaphoid and transfer vascularized graft of dorsal radius pedicled with 1,2 intercompartmental supraretinacular artery (1,2-ICSRA); however, the technique was not well described in detail.[10] Original method by Zaidemberg et al was difficult to graft on radial or volar side of scaphoid. It is necessary to remove radial styloid to access radial aspect of scaphoid and transfer vascularized bone graft (VBG) from dorsal side of distal radius to volar side of scaphoid. Our method involves harvesting a vascularized bone graft from the dorsal radius, followed by insertion of the cortical aspect into the volar side of the scaphoid. This technique also helps create a safe pathway for the pedicle to achieve stable bony union. Since 2011, we have treated 11 cases of scaphoid nonunion with humpback deformity and AVN using this technique. This study retrospectively evaluates the clinical and radiological results of these cases to clarify the surgical efficacy of this procedure.

Materials and Methods

Between 2011 and 2015, we indicated this technique for all scaphoid nonunion with humpback deformity. The definition of scaphoid nonunion was the duration of scaphoid nonunion longer than 6 weeks. Humpback deformity with radiolunate (RL) angle more than 10 degreeswas included in this study. Nonunion was confirmed by an absence of fragment continuity using preoperative plain radiographs and computed tomography (CT). Preoperative scaphoid nonunion advanced collapse (SNAC wrist) stages 2 and 3 were excluded. Patients who have been performed operation for scaphoid was excluded. We evaluated the bony union and RL angle according to radiological outcomes, range of motion (ROM;volar flexion and dorsiflexion), grip strength ratio of injured side to uninjured side, the modified Mayo wrist score (MMWS), disabilities of arm, shoulder, and hand (DASH) score, and complication rates. In addition, we recorded the size of the grafted bone ([Table 1]). Bone union was assessed by CT. Axial, coronal, and sagittal view were reconstructed for each case and bone union was confirmed by bridging callus or heal of gap in more than two dimensions. CT was assessed by surgeon.

Table 1 Clinical data for all 11 patients

Number		1	2	3	4	5	6	7	8	9	10	11	Ave.
Age (y)		17	18	20	29	31	32	49	50	59	68	70	40
Sex/affected hand		M/L	M/R	M/R	M/R	M/L	M/L	M/R	F/R	M/L	M/L	F/L
Nonunion duration		8 mo	5 mo	1 y	2 y	1 y 3 mo	3 mo	2 y 3 mo	30 y	8 mo	30 y	7 mo	6 y 3 mo
Postoperative follow-up period		1 y	5 y	1 y	3 y 7 mo	1 y	1 y	1 y	1 y	3 y 7 mo	2 y 6 mo	2 y	2 y 3 mo
Herbert classification		D2	D2	D3	D3	D2	D2	D3	D3	D2	D3	D2	–
MRI of pre-op	T1	Low	Low	Low	Low	Low	Low	Low	Low	Low	Low	Low	–
	T2	Iso	Iso	Low	High	Iso	Iso	Iso	Low	High	Low	Low	–
Part of nonunion		Mid	Mid	Mid	Dist	Mid	Mid	Mid	Mid	Mid	Mid	Mid	–
Area of grafted bone (cm2)		81	48	81	80	54	81	80	180	81	64	70	82
Preoperative ROM (degree)	VF	45	20	70	70	80	85	65	90	40	N/A	55	62
	DF	75	65	70	45	80	85	60	90	60	N/A	45	68
PostoperativeROM (degree)	VF	80	60	60	80	70	60	60	40	35	55	60	60
	DF	80	80	70	80	90	60	70	60	60	45	70	70
Preoperative grip strength ratio (%)		100	N/A	86	N/A	78	100	86	67	58	122	86	87
Postoperative grip strength ratio (%)		96	98	110	106	88	81	69	80	116	82	96	93
The Mayo wrist score		90	90	90	95	90	90	80	80	90	75	90	87
DASH score		11	1	1	1	0	2	20	5	0	2	0	4
RL angle(degree)	Pre-op	15	33	21	54	21	15	15	35	24	12	27	25
	Post-op	2	13	6	0	5	0	5	20	5	6	10	5
	RL angle	13	20	15	54	16	15	10	15	19	6	17	20
SNAC wrist stage	Pre-op	0	0	0	0	0	0	1	1	1	1	1	–
	Post-op	1	1	1	1	0	0	1	1	1	2	1	–
Union		○	○	○	○	○	○	○	○	○	X	○	–

Abbreviations: Ave., average; DASH, disabilities of arm, shoulder and hand; DF, dorsal flexion; Dist, distal; F, female; L, left; M, male;Mid, medial; MRI, magnetic resonance imaging; N/A, not available (no data in medical record) ; Post-op, postoperative; Pre-op, preoperative; R, right; RL, radiolunate; ROM, range of motion; SNAC, scaphoid nonunion advanced collapse; VF, volar flexion.

Surgical Techniques

A curvilinear incision was made over the first and second retinacular compartments proximal to the scaphoid process ([Figs. 1A] and [2A]) to open the compartments longitudinally. To access volar side of scaphoid, distal edge of incision was made on volar side compared with original method by Zaidemberg et al. The bone graft was harvested through the floor of these two compartments, taking care to maintain the vascular supply of the 1,2-ICSRA ([Fig. 2B]). We harvested approximately 10 mm × 10 mm × 15 mm of corticocancellous bone from the distal radius using a sagittal saw, as proposed by Zaidemberg et al ([Fig. 2C]).[4]

Fig. 1 Schema of our technique. (A) Curved skin incision on the radial side of the wrist. We elevated the harvesting bone pedicled from the 1, 2 intercompartmental supraretinacular artery and detached the joint capsule from the styloid to the volar side. (B) We cut the tip of the radial styloid, excised the volar part of the scaphoid nonunion, and inserted harvested vascularized bone by rotating the cortical aspect of bone to the volar side.

Fig. 2 intraoperative findings. (A) Skin incision. (B) Identified 1,2-ICSRA. (C) Turning the pedicled bone after harvesting. (D) Creating cavity on the scaphoid (arrow) (E) Inserting the vascularized bone onto the volar side. An arrow indicated pedicle. ICSRA, intercompartmental supraretinacular artery.

The distal edge of the pedicle was dissected and lifted with the periosteum of the tip of the radial styloid. After the graft was harvested, we detached the joint capsule, from the styloid to the volar side (5–10 mm from the tip), and the resected the tip of radial styloid to create an intraoperative view of the lateral and volar radial side of the scaphoid. After retracting part of the scaphoid nonunion to the volar side by turning the pedicled vascularized bone, we cleaned the edges of the nonunion by removing any fibrous tissue, particularly on the volar side of the scaphoid bone ([Figs. 1B] and [2D]). We used Tomaino's[11] technique to reduce the dorsal intercalated segment instability (DISI) deformity.[10]

Briefly, the wrist was flexed laterally under fluoroscopic imaging until a neutral RL angle was obtained. Then, we fixed the lunate in this reduced position using the Kirschner wire. Kirschner's wire was inserted from dorsal radius to lunate across RL joint. We measured the size of the bone defect, shaped the harvested bone appropriately, and inserted it with the cortical aspect turned toward the volar side of the scaphoid ([Figs. 1B] and [2E]). The graft was fixed using a retrograde or antegrade cannulated headless screw (DTJ screw,Meira, Nagoya, Japan) with Kirschner's wire added temporarily (percutaneously) parallel to the screw into the wound. The Kirshner wire on the RL joint was removed. The wrist was immobilized in a short-arm thumbspica splint for 6 weeks, after which we removed the splint and the patient began exercises to increase ROM. After bone union was confirmed, the Kirschner wire parallel to the screw was removed.

Results

Between 2011 and 2015, 11 patients of scaphoid nonunion with humpback deformity and AVN were treated with our technique. The mean age of the patients was 40 years (range, 17–70 years) and the dominant wrist was affected in five of these patients. The mean interval from fracture to vascularized bone grafting was 6 years and 3 months (range, 5 months–30 years). Patients were followed-up postoperatively for an average of 2 years 3 months (range, 1–5 years). No patients underwent prior surgeries for the correction of scaphoid nonunion. The nonunion was located at the scaphoid waist in 10 patients and at the distal part in 1 patient. The mean preoperative RL angle was 25 degrees (range, 12–54 degrees). There were five patients with preoperative SNAC wrist stage 1. All the patients were examined using noncontrast magnetic resonance imaging (MRI) that revealed proximal scaphoid AVN as indicated by low signal intensity on T1-weighted images (T1-MRI). Further, four patients also had low-signal intensity on T2-MRI.

[Table 1] presents detailed clinical profiles of the 11 patients. Postoperative CT revealed bony union in 10 patients. Postoperatively, there were eight patients with stage-1 SNAC and 1 patient with stage-2 SNAC. The mean postoperative RL angle was 5 degrees (0–20 degrees) and the mean RL angle was corrected by 19 degrees.

All patients reported reduced or resolved pain and all resumed normal work following surgery. The mean preoperative/postoperative range of motion was 62 degrees (range, 20–90 degrees)/60 degrees (range, 35–80 degrees) in volar flexion (VF) and 68 degrees (range, 45–90 degrees)/70 degrees (range, 45–90 degrees) in dorsiflexion(DF;VF: p = 0.861, DF: p = 0.496). On the injured side, preoperative/postoperative mean grip strength was 87% (range, 58–122%)/93% (range, 69–116%) of the uninjured side (p = 1.000). Postoperative ROM and grip power ratio did not differ from preoperative status (p > 0.05). The average postoperative MMWS was 87 points (range, 75–95 points). According to the category of MMWS, eight patients achieved excellent results, twoachieved good results, and one fair result. The average DASH score was 4 points (range, 0–20 points).

The mean size of the harvested bone (length × width) was 82 mm² (range, 48–180 mm²). All the patients required excision of the radial styloid process. The only notable complication was temporary mild paresthesia of the superficial branch of the radial nerve area in two patients. No pin site infection was occurred.

Sample Case

A 32-year-old male injured her left hand while traffic accident 2 months earlier. He had scaphoid waist nonunion with a RL angle of 15 degrees, and the bone showed low intensity on T1-weighted image and iso intensity on T2-STIR (short TI inversion recovery) weighted images, indicative of AVN ([Fig. 3]). The intraoperative findings were shown in [Fig. 2] ([Fig. 2]). Bone union was confirmed at postoperative 3 months. He reported no pain, her MMWS was excellent at postoperative 1 year. The postoperative RL angle was 0 degrees ([Fig. 4]).

Fig. 3 Preoperative images. (A1) Preoperative anterolateral radiograph. (A2) Preoperative lateral radiograph. Preoperative CT scan:(B1)coronal, (B2) sagittal on the scaphoid, and (B3) sagittal on the lunate. (C1) Preoperative T1-weighted magnetic resonance imaging. (C2)Preoperative T2-STIR image postoperative. CT, computed tomography. STIR, short TI inversion recovery.

Fig.4 Postoperative images. (A1) Postoperative anterolateral radiograph. (A2) Postoperative lateral radiograph. Postoperative CT scan:(B1)coronal, (B2) sagittal on the scaphoid, (B3) sagittal on the lunate.

Discussion

In total, 11 patients of scaphoid nonunion with humpback deformity and AVN were treated with our vascularized bone grafting technique which uses only one incision. In radiological evaluation, 10 patients showed bony union and the mean RL angle was corrected from 25 to 5 degrees. The clinical evaluation of MMWS and DASH score gave fairly good results. Our problem was the need for vascularized bone graft for scaphoid nonunion with humpback deformity and AVN, and the usefulness of single-incision lateral approach.

Historical systematic review of studies on scaphoid nonunion, including 47 publications between 1928 and 2003 including 5,246 cases of scaphoid nonunion, found an average union rate of 78% for proximal pole scaphoid nonunions, including those with AVN, when treated with nonvascularized bone grafting techniques.[12] Recent systematic review between 1999 and 2014 showed improvement of bone union ratio; that of vascularized and nonvascularized bone graftings were 92 and 88%, respectively.[13] Even for case with AVN, the bone union ratio of VBG from distal radius for 78 cases was 96%.[13] Individual studies have reported bony union rates of 60 to 95% for conventional bone grafting of scaphoid nonunion defects.[14] [15] [16] [17] [18] [19] Some of these studies report various treatment challenges associated with AVN, including patients with failed past operations, displaced bones, proximal pole nonunions, and patients with long nonunion times. For recalcitrant scaphoid nonunion, pedicled bone grafting has proven effective, and includes harvesting from the dorsal part of the distal radius as proposed by Zaidemberg et al,[4] or the dorsal base of the second metacarpal bone as proposed by Makino.[5] Ribak et al reported a higher bone union rate with a technique that used vascularized radial bone, compared with one that used nonvascularized radial bone (89.1 vs. 72.5%).[20] They also reported superior clinical scores (72.0 vs. 57.5%).[20] Thus, vascularized bone grafts are recommended for the treatment of scaphoid nonunion associated with AVN.

Successful surgical treatment of scaphoid nonunion and AVN is limited when a humpback deformity is present. For example, Megerle et al reported poorer results in patients with RL angles >10 degrees.[21] Fisk suggested the use of a conventional wedge graft to correct scaphoid length,[3] and Fernandez described a modified wedge graft technique for these patients.[22] Sawaizumi et al[23] harvested vascularized bone from the dorsal base of the second metacarpal bone using Makino's technique[24] and reported better correction of the RL angle, a higher bone union rate (100%), and greater Cooney's clinical score (mean: 82.1 points) after grafting to the volar side. Correction of scaphoid nonunion with humpback deformity requires a large section of hard bone for grafting onto the volar side, especially in case of waist nonunion with humpback deformity. Makino's technique allows for easy insertion because the pedicle artery is wide; however, the dorsal base of the second metacarpal bone is much smaller than the dorsal aspect of the distal radius. Thus, harvesting a large bone section is more difficult. To circumvent this problem, we harvested the graft bone from the dorsal aspect of the distal radius, like the technique of Zaidemberg et al, but we used the direct lateral approach to reduce the risk of pedicle damage. Although original method by Zaidemberg et al used Kirschner wire to fix VBG, we used headless compression screw for internal fixation because we think it is important to compress large hard VBG on fracture site by headless compression screw. Bone union ratio reported on systematic review was 92% by Kirschner wire fixation and 88% by screw fixation.[13]

Tambe et al reported 11 patients treated with vascularized bone grafts from the dorsum of the distal radius.[24] However, correction of the humpback deformity using a single dorsal approach was not possible and the overall union rate was only 55% (6/11). It is possible that their low success rate for bone grafts vascularized from the 1,2 ICSRA was due to palmar rotation, which may “kink” the pedicle during insertion. Alternatively, a scaphoid nonunion with substantial bone loss and a humpback deformity may not heal when the method by Zaidemberg et al is used. Arora et al obtained bony union in 16 of 21 patients with partial correction of palmar rotation of the scaphoid and DISI deformity using free vascularized iliac crest bone grafts.[25] Jones et al found that the union rate of the proximal scaphoid fragment in patients with wrist nonunion and collapse was much lower when the method by Zaidemberg et al was used (40%) than a free vascularized bone graft method (100%).[26] Collectively, these reports suggest limited success using a pedicled vascularized bone graft. While the method by Zaidemberg et al allows for easy harvesting of a large bone section, the pedicle artery is narrow, increasing the risk of damage. Our technique of vascularized bone grafting using a direct lateral approach solved these problems. By detaching the joint capsule from the radius styloid and cutting it, we could safely move the pedicle to insert the graft bone onto the volar side for precise humpback deformity correction using hard cortical bone, and there was no need to cut the volar capsule or the volar wrist ligament. It is also safe, because the vascular anatomy in the harvested region is well understood.[27]

A radial approach for scaphoid nonunion was reported as early as 1946 by Murray[28] who resected the radial styloid from the radial side and used it as a peg for bone union. Later, Cooneyet al[14] and Barnard and Stubbins[29] developed a modified technique for nonvascularized bone grafting using the radial approach. Alternatively, Moreno and Gupta[30] treated scaphoid nonunion with a vascularized bone graft using a dorsi radial approach, similar to our technique, but only for proximal scaphoid nonunions. In addition, the graft was not inserted on the volar side and their long-term results were not reported.[30] Our technique uses a morelateral approach that allows for safe detachment of the capsule from the radial styloid based on the arterial anatomy reported by Waitayawinyu et al.[10] [26] The primary advantages of our technique are the preservation of pedicle tension (because the pedicle is routed along a shortcut to the scaphoid bone) and the ability to graft a large section of hard cortical bone onto the volar side. However, there were only two cases of longstanding interval from fracture of more than 10 years. Because one of the two cases failed to show bone union, we were unable to conclude that our technique is a good adaptation for longstanding scaphoid nonunion.

The indication of this technique for elderly patients (older than 65 years old) seemed to be challenging. Patient no.10 who failed to union was 68 years old and duration of nonunion was 30 years with AVN, SNAC wrist stage I, and humpback deformity. Patient no.11 who achieved bone union was 70 years old with AVN and SNAC stage I but duration of disease was only 7 months. We think application of this technique for elderly patients with risks of nonunion would be challenging and proximal low carpectomy would be a better and simple surgical option than our technique.

Limitations

This study has several limitations. First, it is a retrospective case series and therefore not homogenous. The interval from injury to surgery ranged widely from 2 month to 30 years and wide age range with some cases of SNAC wrist. In particular, the longstanding cases of more than 10 years were only two, and this sample data are small. Second, there was no controlled study of conventional treatment of vascularized bone graft.

Conclusion

In conclusion, our technique was useful for scaphoid nonunion with humpback deformity and AVN using only one incision.

Conflict of Interest

None declared.

• References

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Publication History

Received: 11 November 2019

Accepted: 06 July 2020

Article published online:
03 September 2020